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From: Paul Dunda <paul@obt.net.au>
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Subject: [Xen-users] Help to debug xen dom0 boot failure
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From: "Roalt Zijlstra | webpower" <roalt.zijlstra@webpower.nl>
Date: Mon, 3 Dec 2018 09:50:37 +0100
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To: paul@obt.net.au
Subject: Re: [Xen-users] Help to debug xen dom0 boot failure
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Hi Paul,

It is not clear to me if you have a fresh install or already a working OS
on the server. I have experienced trouble installing Debian 9 on a Dell
R740 as the Perc controller was not recognised at install time. This Perc
H740P controller is too new and is not supported by the 4.9 kernel and it
is support as of the 4.11 kernel (not 100% sure).  If you already have an
OS on the server then you should try to use the  4.16/17/18 kernels of
backports. Those will boot.

I do have a patched installer ISO with a newer hacked in megaraid driver
which worked for me. If you want to give that a try, send me a private mail.

Best regards,

  Roalt Zijlstra
    Teamleader Infra & Deliverability

  roalt.zijlstra@webpower.nl
  +31 342 423 262
  roalt.zijlstra
  https://www.webpower-group.com

<https://www.webpower-group.com/>

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Op ma 3 dec. 2018 om 06:31 schreef Paul Dunda <paul@obt.net.au>:

> Hi. I have Linux 4.9.0-8-amd64 #1 SMP Debian 4.9.130-2 (2018-10-27)
> x86_64 GNU/Linux with xen-system-amd64
> 4.8.4+xsa273+shim4.10.1+xsa273-1+deb9u10. Debian itself boots fine but,
> xen dom0 boot fails with - megaraid_sas Failed from
> megasas_alloc_request_fusion. Gave up waiting for root file system -
> Fails on Dell R7425 with raid 1 ssd   PERC H740P Adapter. I have this
> same Debian & Xen configuration running happily on a Dell R530 ssd raid
> 1 PERC H730 raid controller. Can someone help to guide me to debug and
> capture information to determine the issue? Thanks.
>
> After suggestions from the #debian-xen irc I made changes to increase
> dom0 memory with the following outcomes :-
>
> Increase from 1G to 4G > exactly the same error
>
> Increase to 8G and increase cpus from 1 to 4 the error changes :-
> [Firmware Bug ]: cpu 0 try to use APIC520 for vector 0xf4 but the
> register is already in use for vector 0x0 on this cpu. Similar for cpu 1
> , ending up with Gave up waiting for root file system.
>
> GRUB_CMDLINE_XEN="'dom0_mem=8192M,max:8192M'  dom0_max_vcpus=4
> dom0_vcpus_pin"
>
> originally
>
> GRUB_CMDLINE_XEN="'dom0_mem=1024M,max:1024M'  dom0_max_vcpus=1
> dom0_vcpus_pin"
>
> Thanks.
>
> --
> Paul Dunda | Principal
> Open Business Technology
> mob. +61 418 967 719
> https://obt.net.au
>
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xenproject.org
> https://lists.xenproject.org/mailman/listinfo/xen-users

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif;font-size:small">Hi Paul,</div><div class=3D"gmail_defau=
lt" style=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br></=
div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-=
serif;font-size:small">It is not clear to me if you have a fresh install or=
 already a working OS on the server. I have experienced trouble installing =
Debian 9 on a Dell R740 as the Perc controller was not recognised at instal=
l time. This Perc=C2=A0<span style=3D"font-family:Arial,Helvetica,sans-seri=
f">H740P=C2=A0</span>controller is too new and is not supported by the 4.9 =
kernel and it is support as of the 4.11 kernel (not 100% sure).=C2=A0 If yo=
u already have an OS on the server then you should try to use the=C2=A0 4.1=
6/17/18 kernels of backports. Those will boot.</div><div class=3D"gmail_def=
ault" style=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br>=
</div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,san=
s-serif;font-size:small">I do have a patched installer ISO with a newer hac=
ked in megaraid driver which worked for me. If you want to give that a try,=
 send me a private mail.</div><div class=3D"gmail_default" style=3D"font-fa=
mily:arial,helvetica,sans-serif;font-size:small"><br></div><div><div dir=3D=
"ltr" class=3D"gmail_signature" data-smartmail=3D"gmail_signature"><div dir=
=3D"ltr"><div><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=
=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr=
"><div dir=3D"ltr"><div style=3D"color:rgb(102,102,102);font-family:arial,h=
elvetica,sans-serif;font-size:12.8px"><div dir=3D"ltr"><div dir=3D"ltr" sty=
le=3D"font-size:12.8px;color:rgb(34,34,34);font-family:arial,sans-serif"><t=
able width=3D"100%" cellpadding=3D"0" cellspacing=3D"0" style=3D"color:rgb(=
0,0,0);font-family:&quot;Times New Roman&quot;;font-size:medium"><tbody><tr=
><td valign=3D"top" align=3D"left" style=3D"color:rgb(88,89,91);font-size:1=
3px;line-height:16px"><table width=3D"100%" cellpadding=3D"0" cellspacing=
=3D"0" style=3D"font-family:&quot;Times New Roman&quot;;color:rgb(0,0,0);fo=
nt-size:medium"><tbody><tr><td valign=3D"top" align=3D"left" style=3D"color=
:rgb(88,89,91);font-size:13px;line-height:16px"><font face=3D"verdana, sans=
-serif">Best regards,</font></td></tr><tr><td valign=3D"top" align=3D"left"=
 width=3D"20"><font face=3D"verdana, sans-serif">=C2=A0</font></td></tr></t=
body></table><table width=3D"320" cellpadding=3D"0" cellspacing=3D"0" style=
=3D"color:rgb(0,0,0);font-size:medium"><tbody><tr><td valign=3D"top" align=
=3D"left" width=3D"20"><img src=3D"https://www.webpower.nl/signature/images=
/icon_user.jpg" title=3D"Naam" width=3D"20" style=3D"display:block"></td><t=
d valign=3D"top" align=3D"left" width=3D"20"><font face=3D"verdana, sans-se=
rif">=C2=A0</font></td><td valign=3D"middle" align=3D"left" style=3D"color:=
rgb(102,44,138);font-size:18px;font-weight:bold;line-height:16px"><font fac=
e=3D"verdana, sans-serif">Roalt Zijlstra</font></td></tr><tr><td valign=3D"=
top" align=3D"left" width=3D"20"><font face=3D"verdana, sans-serif">=C2=A0<=
/font></td><td valign=3D"top" align=3D"left" width=3D"20"><font face=3D"ver=
dana, sans-serif">=C2=A0</font></td><td valign=3D"middle" align=3D"left" st=
yle=3D"font-style:italic;color:rgb(88,89,91);font-size:13px;line-height:16p=
x"><font face=3D"verdana, sans-serif">Teamleader Infra &amp; Deliverability=
</font></td></tr><tr><td valign=3D"top" align=3D"left" width=3D"20"><font f=
ace=3D"verdana, sans-serif">=C2=A0</font></td><td valign=3D"top" align=3D"l=
eft" width=3D"20"><font face=3D"verdana, sans-serif">=C2=A0</font></td><td =
valign=3D"top" align=3D"left" style=3D"color:rgb(88,89,91);font-size:13px;l=
ine-height:16px"><font face=3D"verdana, sans-serif">=C2=A0</font></td></tr>=
<tr><td valign=3D"top" align=3D"left" width=3D"20"><img src=3D"https://www.=
webpower.nl/signature/images/icon_email.jpg" width=3D"20" title=3D"Email" s=
tyle=3D"display:block;width:20px"></td><td valign=3D"top" align=3D"left" wi=
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-height:16px"><a href=3D"mailto:roalt.zijlstra@webpower.nl" title=3D"webpow=
er" style=3D"color:rgb(245,126,55)" target=3D"_blank"><font face=3D"verdana=
, sans-serif">roalt.zijlstra@webpower.nl</font></a></td></tr><tr><td valign=
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y:block;width:20px"></td><td valign=3D"top" align=3D"left" width=3D"20"><fo=
nt face=3D"verdana, sans-serif">=C2=A0</font></td><td valign=3D"middle" ali=
gn=3D"left" style=3D"color:rgb(88,89,91);font-size:13px;line-height:16px"><=
font face=3D"verdana, sans-serif">+31 342 423 262</font></td></tr><tr><td v=
align=3D"top" align=3D"left" width=3D"20"><img src=3D"https://www.webpower.=
nl/signature/images/icon_skype.jpg" title=3D"Skype" width=3D"20" style=3D"d=
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" align=3D"left" style=3D"color:rgb(88,89,91);font-size:13px;line-height:16=
px"><font face=3D"verdana, sans-serif">roalt.zijlstra</font></td></tr><tr><=
td valign=3D"top" align=3D"left" width=3D"20"><img src=3D"https://www.webpo=
wer.nl/signature/images/icon_url.jpg" width=3D"20" title=3D"Phone" style=3D=
"display:block;width:20px"></td><td valign=3D"top" align=3D"left" width=3D"=
20"><font face=3D"verdana, sans-serif">=C2=A0</font></td><td valign=3D"midd=
le" align=3D"left" style=3D"color:rgb(88,89,91);font-size:13px;line-height:=
16px"><a href=3D"https://www.webpower-group.com/" title=3D"webpower" style=
=3D"color:rgb(245,126,55)" target=3D"_blank"><font face=3D"verdana, sans-se=
rif">https://www.webpower-group.com</font></a></td></tr><tr><td valign=3D"t=
op" align=3D"left" width=3D"20"><font face=3D"verdana, sans-serif">=C2=A0</=
font></td><td valign=3D"top" align=3D"left" width=3D"20"></td><td valign=3D=
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t:16px"></td></tr></tbody></table><table width=3D"320" cellpadding=3D"0" ce=
llspacing=3D"0" style=3D"color:rgb(0,0,0);font-size:medium"><tbody><tr><td =
valign=3D"top" align=3D"left"><a href=3D"https://www.webpower-group.com/" t=
itle=3D"Webpower" target=3D"_blank"><font face=3D"verdana, sans-serif"><img=
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" title=3D"Webpower" border=3D"0" style=3D"display:block;border:none;width:=
202px"></font></a></td></tr><tr><td valign=3D"top" align=3D"left" height=3D=
"10" style=3D"line-height:10px"><font face=3D"verdana, sans-serif">=C2=A0</=
font></td></tr><tr><td valign=3D"top" align=3D"left"><table cellpadding=3D"=
0" cellspacing=3D"0"><tbody><tr><td valign=3D"top" align=3D"left" width=3D"=
24"><a href=3D"https://www.facebook.com/webpower.marketingautomation/" titl=
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gn=3D"left" width=3D"10"><font face=3D"verdana, sans-serif">=C2=A0</font></=
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nkedin.com/company/36782/" title=3D"Linkedin" target=3D"_blank"><font face=
=3D"verdana, sans-serif"><img src=3D"https://www.webpower.nl/signature/imag=
es/wp_linkedin.jpg" width=3D"24" alt=3D"Linkedin" border=3D"0" style=3D"dis=
play:block;width:24px"></font></a></td></tr></tbody></table></td></tr></tbo=
dy></table><table width=3D"320" cellpadding=3D"0" cellspacing=3D"0" style=
=3D"color:rgb(0,0,0);font-size:medium"><tbody><tr><td valign=3D"top" align=
=3D"left" width=3D"5"></td><td valign=3D"top" align=3D"left" style=3D"paddi=
ng-top:5px;padding-bottom:5px;font-family:Verdana,sans-serif,&quot;Lucida G=
rande&quot;;border-top:1px solid rgb(221,221,221);font-size:9px;line-height=
:13px;color:rgb(88,89,91)"><font face=3D"verdana, sans-serif">Barcelona | B=
arneveld | Beijing | Chengdu | Guangzhou<br>Hamburg | Shanghai | Shenzhen |=
 Stockholm</font></td><td valign=3D"top" align=3D"left" width=3D"5"><font f=
ace=3D"verdana, sans-serif">=C2=A0</font></td></tr></tbody></table></td></t=
r></tbody></table><table width=3D"320" cellpadding=3D"0" cellspacing=3D"0" =
style=3D"color:rgb(0,0,0);font-family:&quot;Times New Roman&quot;;font-size=
:medium"><tbody><tr><td valign=3D"top" align=3D"left" width=3D"5"></td><td =
valign=3D"top" align=3D"left" style=3D"padding-top:5px;padding-bottom:5px;f=
ont-family:Verdana,sans-serif,&quot;Lucida Grande&quot;;border-top:1px soli=
d rgb(221,221,221);font-size:9px;line-height:13px;color:rgb(88,89,91)"><a h=
ref=3D"https://webpower.nl/event/kennissessies/?utm_source=3DGML&amp;utm_me=
dium=3DEMAIL&amp;utm_campaign=3DEVENT&amp;utm_term=3DKNOWLDGS&amp;utm_conte=
nt=3DNL" title=3D"Webpower Food for Thought-kennissessies" style=3D"font-fa=
mily:&quot;Times New Roman&quot;;font-size:medium" target=3D"_blank"><img s=
rc=3D"https://webpower.nl/signature/images/wp_footer_banner.jpg" border=3D"=
0" style=3D"display:block"></a></td></tr></tbody></table></div></div></div>=
</div></div></div></div></div></div></div></div></div></div></div></div></d=
iv><br></div><br><div class=3D"gmail_quote"><div dir=3D"ltr">Op ma 3 dec. 2=
018 om 06:31 schreef Paul Dunda &lt;<a href=3D"mailto:paul@obt.net.au">paul=
@obt.net.au</a>&gt;:<br></div><blockquote class=3D"gmail_quote" style=3D"ma=
rgin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi. I have Lin=
ux 4.9.0-8-amd64 #1 SMP Debian 4.9.130-2 (2018-10-27) <br>
x86_64 GNU/Linux with xen-system-amd64 <br>
4.8.4+xsa273+shim4.10.1+xsa273-1+deb9u10. Debian itself boots fine but, <br=
>
xen dom0 boot fails with - megaraid_sas Failed from <br>
megasas_alloc_request_fusion. Gave up waiting for root file system - <br>
Fails on Dell R7425 with raid 1 ssd=C2=A0=C2=A0 PERC H740P Adapter. I have =
this <br>
same Debian &amp; Xen configuration running happily on a Dell R530 ssd raid=
 <br>
1 PERC H730 raid controller. Can someone help to guide me to debug and <br>
capture information to determine the issue? Thanks.<br>
<br>
After suggestions from the #debian-xen irc I made changes to increase <br>
dom0 memory with the following outcomes :-<br>
<br>
Increase from 1G to 4G &gt; exactly the same error<br>
<br>
Increase to 8G and increase cpus from 1 to 4 the error changes :-=C2=A0 <br=
>
[Firmware Bug ]: cpu 0 try to use APIC520 for vector 0xf4 but the <br>
register is already in use for vector 0x0 on this cpu. Similar for cpu 1 <b=
r>
, ending up with Gave up waiting for root file system.<br>
<br>
GRUB_CMDLINE_XEN=3D&quot;&#39;dom0_mem=3D8192M,max:8192M&#39;=C2=A0 dom0_ma=
x_vcpus=3D4 <br>
dom0_vcpus_pin&quot;<br>
<br>
originally<br>
<br>
GRUB_CMDLINE_XEN=3D&quot;&#39;dom0_mem=3D1024M,max:1024M&#39;=C2=A0 dom0_ma=
x_vcpus=3D1 <br>
dom0_vcpus_pin&quot;<br>
<br>
Thanks.<br>
<br>
-- <br>
Paul Dunda | Principal<br>
Open Business Technology<br>
mob. +61 418 967 719<br>
<a href=3D"https://obt.net.au" rel=3D"noreferrer" target=3D"_blank">https:/=
/obt.net.au</a><br>
<br>
<br>
_______________________________________________<br>
Xen-users mailing list<br>
<a href=3D"mailto:Xen-users@lists.xenproject.org" target=3D"_blank">Xen-use=
rs@lists.xenproject.org</a><br>
<a href=3D"https://lists.xenproject.org/mailman/listinfo/xen-users" rel=3D"=
noreferrer" target=3D"_blank">https://lists.xenproject.org/mailman/listinfo=
/xen-users</a></blockquote></div>

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From: Vishnu Pajjuri <vishnu.socialac@gmail.com>
Date: Thu, 13 Dec 2018 15:37:28 +0530
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Subject: [Xen-users] Does xen-pciback driver support for arm64 is there in
 linux kernel.?
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Hi,
  I'm trying XEN on arm64. So I wanted to use PCI pass-through feature in
arm64 platform.
As I was trying to find it out in Linux kernel 4.18.20 it is depends on x86.

Kindly let me know that whether this driver support for arm64 is there or
not in Linux kernel. If YES then kindly let me know how to use it.

Kindly let me know if any other work around is available to pass-through
PCI devices

*Regards*,
-Vishnu.

--00000000000015e4d9057ce47c4b
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<div dir=3D"ltr">Hi,<div>=C2=A0 I&#39;m trying XEN on arm64. So I wanted to=
 use PCI pass-through feature in arm64 platform.</div><div>As I was trying =
to find it out in Linux kernel 4.18.20 it is depends on x86.</div><div><br>=
</div><div>Kindly let me know that whether this driver support for arm64 is=
 there or not in Linux kernel. If YES then kindly let me know how to use it=
.</div><div><br></div><div>Kindly let me know if any other work around is a=
vailable to pass-through PCI devices</div><div><br></div><div><u>Regards</u=
>,</div><div>-Vishnu.</div></div>

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References: <011501d4955e$5dc7b2e0$195718a0$@intra.gordijn.org>
 <f87afbf7-db52-38f9-e7d5-0464a7edc046@alstadheim.priv.no>
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From: "Roalt Zijlstra | webpower" <roalt.zijlstra@webpower.nl>
Date: Mon, 17 Dec 2018 10:32:31 +0100
Message-ID: <CAC7+sxXqFU1K97kH1YMp7cxrih+89U9jnUBBtLMcRjhMmAhT0A@mail.gmail.com>
To: =?UTF-8?Q?H=C3=A5kon_Alstadheim?= <hakon@alstadheim.priv.no>
Subject: Re: [Xen-users] Disk performance on guest incredibly low.
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Hey H=C3=A5kon,

One little tip on disk IO in Virtual hosts, is changing the FS scheduler
from cfq to noop. In our Xen PV configs we add this to the xen.cfg files at
the end:

extra=3D"clocksource=3Dtsc elevator=3Dnoop"

Especially the "elevator=3Dnoop" parameter is forcing all FS-es to the noop
scheduler. In my experience that gave our Xenservers a pretty nice boost.
Red Hat does recoomend this for all Virtual servers (see the link below).
To test this you don't need to reboot at all.

For example from the link below there is a code snippet about getting and
setting the scheduler for /dev/hda. (Replace hda with sdb or any other
block device)

# cat /sys/block/hda/queue/scheduler
noop anticipatory deadline [cfq]

# echo 'noop' > /sys/block/hda/queue/scheduler
# cat /sys/block/hda/queue/scheduler
[noop] anticipatory deadline cfq


More info: https://access.redhat.com/solutions/5427

Best regards,

  Roalt Zijlstra
    Teamleader Infra & Deliverability

  roalt.zijlstra@webpower.nl
  +31 342 423 262
  roalt.zijlstra
  https://www.webpower-group.com

<https://www.webpower-group.com/>

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Op zo 16 dec. 2018 om 20:18 schreef H=C3=A5kon Alstadheim <
hakon@alstadheim.priv.no>:

>
> Den 16.12.2018 17:42, skrev frm@gordijn.org:
> > My disk performance of Xen guest is very slow. My latest configuration:
> >
> > At guest, I have:
> >
> > `    dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 conv=3Dfsync of=
lag=3Ddirect
> >      1024+0 records in
> >      1024+0 records out
> >      1073741824 bytes (1.1 GB, 1.0 GiB) copied, 15.6421 s, 68.6 MB/s
> > `
> >
> > At Dom0 I have:
> >
> > `    dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 conv=3Dfsync of=
lag=3Ddirect
> >      1024+0 records in
> >      1024+0 records out
> > 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 3.81855 s, 281 MB/s
> > `
> >
> > The dom0 is about 5 times faster than the guest.
> >
> Worse here, 15 to 20 x slower (I did a few runs just now, numbers vary
> by quite a lot, but the magnitude difference is consistent). Same md
> partition mounted on dom0 and as domu root. Md constituents are SAS
> spinning rust. In the past I've tried looking at tunables for the domu
> disks, to no effect. I would love a "domu disk tuning for dummies" .
> Throughput speed is tolerable usually, but when a rebuild is running on
> the disk-array, the domus are all but unusable interactively. I've been
> poking at this issue for a couple of years, not getting anywhere. The
> poking has been totally devoid of proper notes and a strategy, but over
> time I have ditched LVM and tried various schedulers, triple-checked
> alignment, used both xfs and ext4, all without ever seeing a definitive
> break-through. I had bcache with an m2 ssd on top of LVM for a while
> until my m2 wore out. That helped paper over the issue. (bcache on top
> of virtual devices is not recommended, btw. If done, make sure you use
> no-discard on the disk-configuration for the vm)
>
> Xentop:
>
> xentop - 20:06:04   Xen 4.11.1
>       NAME  STATE   CPU(sec) CPU(%)     MEM(k) MEM(%) VCPUS
>    Domain-0 -----r      33821    8.1    4995856    7.5 8
>   steam.hvm --b---         51    0.3    7332136   11.0 6
>
> Guest steam:
>
> # df -hT  /tmp
> Filsystem      Type St=C3=B8rrelse Brukt Tilgj. Bruk% Montert p=C3=A5
> /dev/xvdb      ext4      196G  162G    25G   87% /
> # cd /tmp
> # dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 conv=3Dfsync oflag=
=3Ddirect
> 1024+0 oppf=C3=B8ringer inn
> 1024+0 oppf=C3=B8ringer ut
> 1073741824 byte (1,1 GB, 1,0 GiB) kopiert, 60,1407 s, 17,9 MB/s
>
> Dom0:
>
>   # df -hT ./
> Filesystem     Type  Size  Used Avail Use% Mounted on
>
> /dev/md2p8     ext4  196G  163G   24G  88% /mnt/tull
>
> # dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 conv=3Dfsync oflag=
=3Ddirect
> 1024+0 records in
> 1024+0 records out
> 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 5.37238 s, 200 MB/s
>
>
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xenproject.org
> https://lists.xenproject.org/mailman/listinfo/xen-users

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<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div cl=
ass=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;font-=
size:small">Hey H=C3=A5kon,</div><div class=3D"gmail_default" style=3D"font=
-family:arial,helvetica,sans-serif;font-size:small"><br></div><div class=3D=
"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;font-size:s=
mall">One little tip on disk IO in Virtual hosts, is changing the FS schedu=
ler from cfq to noop. In our Xen PV configs we add this to the xen.cfg file=
s at the end:</div><div class=3D"gmail_default" style=3D"font-family:arial,=
helvetica,sans-serif;font-size:small"><br></div><div class=3D"gmail_default=
"><font face=3D"arial, helvetica, sans-serif">extra=3D&quot;clocksource=3Dt=
sc elevator=3Dnoop&quot;</font><br></div><div class=3D"gmail_default" style=
=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br></div><div =
class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;fon=
t-size:small">Especially the &quot;elevator=3Dnoop&quot; parameter is forci=
ng all FS-es to the noop scheduler. In my experience that gave our Xenserve=
rs a pretty nice boost.</div><div class=3D"gmail_default" style=3D"font-fam=
ily:arial,helvetica,sans-serif;font-size:small">Red Hat does recoomend this=
 for all Virtual servers (see the link below). To test this you don&#39;t n=
eed to reboot at all.</div><div class=3D"gmail_default" style=3D"font-famil=
y:arial,helvetica,sans-serif;font-size:small"><br></div><div class=3D"gmail=
_default" style=3D"font-family:arial,helvetica,sans-serif;font-size:small">=
For example from the link below there is a code snippet about getting and s=
etting the scheduler for /dev/hda. (Replace hda with sdb or any other block=
 device)</div><div class=3D"gmail_default" style=3D"font-family:arial,helve=
tica,sans-serif;font-size:small"><br></div><div class=3D"gmail_default" sty=
le=3D"font-family:arial,helvetica,sans-serif;font-size:small"><pre style=3D=
"color:rgb(0,0,0)"># cat /sys/block/hda/queue/scheduler
noop anticipatory deadline [cfq]

# echo &#39;noop&#39; &gt; /sys/block/hda/queue/scheduler
# cat /sys/block/hda/queue/scheduler
[noop] anticipatory deadline cfq</pre></div><div class=3D"gmail_default" st=
yle=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br></div><d=
iv class=3D"gmail_default"><font face=3D"arial, helvetica, sans-serif">More=
 info: <a href=3D"https://access.redhat.com/solutions/5427">https://access.=
redhat.com/solutions/5427</a></font><br></div><div class=3D"gmail_default" =
style=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br></div>=
<div><div dir=3D"ltr" class=3D"gmail_signature"><div dir=3D"ltr"><div><div =
dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"=
ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><d=
iv style=3D"color:rgb(102,102,102);font-family:arial,helvetica,sans-serif;f=
ont-size:12.8px"><div dir=3D"ltr"><div dir=3D"ltr" style=3D"font-size:12.8p=
x;color:rgb(34,34,34);font-family:arial,sans-serif"><table width=3D"100%" c=
ellpadding=3D"0" cellspacing=3D"0" style=3D"color:rgb(0,0,0);font-family:&q=
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lign=3D"left" style=3D"color:rgb(88,89,91);font-size:13px;line-height:16px"=
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e:13px;line-height:16px"><font face=3D"verdana, sans-serif">Best regards,</=
font></td></tr><tr><td valign=3D"top" align=3D"left" width=3D"20"><font fac=
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=3DGML&amp;utm_medium=3DEMAIL&amp;utm_campaign=3DEVENT&amp;utm_term=3DKNOWL=
DGS&amp;utm_content=3DNL" title=3D"Webpower Food for Thought-kennissessies"=
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/div></div></div></div><br></div></div></div></div><br><div class=3D"gmail_=
quote"><div dir=3D"ltr">Op zo 16 dec. 2018 om 20:18 schreef H=C3=A5kon Alst=
adheim &lt;<a href=3D"mailto:hakon@alstadheim.priv.no">hakon@alstadheim.pri=
v.no</a>&gt;:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0p=
x 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><b=
r>
Den 16.12.2018 17:42, skrev <a href=3D"mailto:frm@gordijn.org" target=3D"_b=
lank">frm@gordijn.org</a>:<br>
&gt; My disk performance of Xen guest is very slow. My latest configuration=
:<br>
&gt;<br>
&gt; At guest, I have:<br>
&gt;<br>
&gt; `=C2=A0 =C2=A0 dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 conv=
=3Dfsync oflag=3Ddirect<br>
&gt;=C2=A0 =C2=A0 =C2=A0 1024+0 records in<br>
&gt;=C2=A0 =C2=A0 =C2=A0 1024+0 records out<br>
&gt;=C2=A0 =C2=A0 =C2=A0 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 15.6421=
 s, 68.6 MB/s<br>
&gt; `<br>
&gt;<br>
&gt; At Dom0 I have:<br>
&gt;<br>
&gt; `=C2=A0 =C2=A0 dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 conv=
=3Dfsync oflag=3Ddirect<br>
&gt;=C2=A0 =C2=A0 =C2=A0 1024+0 records in<br>
&gt;=C2=A0 =C2=A0 =C2=A0 1024+0 records out<br>
&gt; 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 3.81855 s, 281 MB/s<br>
&gt; `<br>
&gt;<br>
&gt; The dom0 is about 5 times faster than the guest.<br>
&gt;<br>
Worse here, 15 to 20 x slower (I did a few runs just now, numbers vary <br>
by quite a lot, but the magnitude difference is consistent). Same md <br>
partition mounted on dom0 and as domu root. Md constituents are SAS <br>
spinning rust. In the past I&#39;ve tried looking at tunables for the domu =
<br>
disks, to no effect. I would love a &quot;domu disk tuning for dummies&quot=
; . <br>
Throughput speed is tolerable usually, but when a rebuild is running on <br=
>
the disk-array, the domus are all but unusable interactively. I&#39;ve been=
 <br>
poking at this issue for a couple of years, not getting anywhere. The <br>
poking has been totally devoid of proper notes and a strategy, but over <br=
>
time I have ditched LVM and tried various schedulers, triple-checked <br>
alignment, used both xfs and ext4, all without ever seeing a definitive <br=
>
break-through. I had bcache with an m2 ssd on top of LVM for a while <br>
until my m2 wore out. That helped paper over the issue. (bcache on top <br>
of virtual devices is not recommended, btw. If done, make sure you use <br>
no-discard on the disk-configuration for the vm)<br>
<br>
Xentop:<br>
<br>
xentop - 20:06:04=C2=A0=C2=A0 Xen 4.11.1<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 NAME=C2=A0 STATE=C2=A0=C2=A0 CPU(sec) CPU(%)=
=C2=A0=C2=A0=C2=A0=C2=A0 MEM(k) MEM(%) VCPUS<br>
=C2=A0=C2=A0 Domain-0 -----r=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 33821=C2=A0=C2=
=A0=C2=A0 8.1=C2=A0=C2=A0=C2=A0 4995856=C2=A0=C2=A0=C2=A0 7.5 8<br>
=C2=A0=C2=A0steam.hvm --b---=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 51=C2=A0=C2=A0=C2=A0 0.3=C2=A0=C2=A0=C2=A0 7332136=C2=A0=C2=A0 11.0 6<b=
r>
<br>
Guest steam:<br>
<br>
# df -hT=C2=A0 /tmp<br>
Filsystem=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Type St=C3=B8rrelse Brukt Tilgj. Br=
uk% Montert p=C3=A5<br>
/dev/xvdb=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ext4=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
196G=C2=A0 162G=C2=A0=C2=A0=C2=A0 25G=C2=A0=C2=A0 87% /<br>
# cd /tmp<br>
# dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 conv=3Dfsync oflag=3Dd=
irect<br>
1024+0 oppf=C3=B8ringer inn<br>
1024+0 oppf=C3=B8ringer ut<br>
1073741824 byte (1,1 GB, 1,0 GiB) kopiert, 60,1407 s, 17,9 MB/s<br>
<br>
Dom0:<br>
<br>
=C2=A0=C2=A0# df -hT ./<br>
Filesystem=C2=A0=C2=A0=C2=A0=C2=A0 Type=C2=A0 Size=C2=A0 Used Avail Use% Mo=
unted on<br>
<br>
/dev/md2p8=C2=A0=C2=A0=C2=A0=C2=A0 ext4=C2=A0 196G=C2=A0 163G=C2=A0=C2=A0 2=
4G=C2=A0 88% /mnt/tull<br>
<br>
# dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 conv=3Dfsync oflag=3Dd=
irect<br>
1024+0 records in<br>
1024+0 records out<br>
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 5.37238 s, 200 MB/s<br>
<br>
<br>
<br>
_______________________________________________<br>
Xen-users mailing list<br>
<a href=3D"mailto:Xen-users@lists.xenproject.org" target=3D"_blank">Xen-use=
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<a href=3D"https://lists.xenproject.org/mailman/listinfo/xen-users" rel=3D"=
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Subject: Re: [Xen-users] Disk performance on guest incredibly low.
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bi9saXN0aW5mby94ZW4tdXNlcnM=

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From: Vikram K <vikram.k@pathpartnertech.com>
Date: Tue, 18 Dec 2018 10:56:12 +0530
Message-ID: <CAFsJcmYMd_S4wONZ8DZfRVb5joh-KrGqnWAcXpH8Tn6n62OySQ@mail.gmail.com>
To: xen-devel@lists.xenproject.org, xen-users@lists.xenproject.org
Subject: [Xen-users] [XEN][ARM64] PV DRM failing to convert virtual to
 physical address
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Hello,

When PV DRM is enabled and Domain-U is started xen is not able to converted
virtual address to physical. Please provide input on resolving this issue.

Please find the details below.

   - We are using 64 bit arm platform.
   - Linux 4.20 Kernel in DomU with PV DRM front-end drivers.
   - Xen-4.12 unstable version.
   - Able to build displ_be application and also its dependencies.

Added below configuration in Domain-U config file.
*vdispl =3D [ 'backend=3DDomD,be-alloc=3D0,connectors=3DHDMI-A-1:1920x1080'=
]*

Before launching the application ran the displ_be application in the
background.
 $ displ_be -m DRM -v *:Debug

Started Domain-U.
$ xl create -c debian.cfg

Getting below logs.
Welcome to Debian GNU/Linux 9 (stretch)!

(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050
flags=3D0x1 par=3D0x809
[    2.601162] systemd[1]: Set hostname to <hikey960>.
[    2.613526] random: systemd: uninitialized urandom read (16 bytes
re(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
ad)
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
[    3.006492] systemd[1]: Reached target Remote File Systems.
[  OK  ] Reached target Remote File Systems.
[    3.007179] systemd[1]: Started Dispatch Password Requests to Console
Directory Watch.
[  OK  ] Started Dispatch Password Requests to Console Directory Watch.
[    3.007477] systemd[1]: Listening on Journal Socket.
[  OK  ] Listening on Journal Socket.
[    3.007742] systemd[1]: Listening on LVM2 metadata daemon socket.
[  OK  ] Listening on LVM2 metadata daemon socket.
[    3.007966] systemd[1]: Listening on Device-mapper event daemon FIFOs.
[  OK  ] Listening on Device-mapper event daemon FIFOs.
[    3.008161] systemd[1]: Listening on Syslog Socket.
[  OK  ] Listening on Syslog Socket.
[  OK  ] Listening on Journal Audit Socket.
[  OK  ] Listening on /dev/initctl Compatibility Named Pipe.
[  OK  ] Created slice System Slice.
         Starting Remount Root and Kernel File Systems...
         Starting Monitoring of LVM2 mirrors=E2=80=A6ng dmeventd or progres=
s
polling...
[(XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed va=3D0xffff80003df8305f
flags=3D0x1 par=3D0x809
  (XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed va=3D0xffff80003df83050
flags=3D0x1 par=3D0x809
OK  ] Created slice system-serial\x2dgetty.slice.
         Mounting Huge Pages File System...
         Starting Uncomplic(XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed
va=3D0xffff80003df8305f flags=3D0x1 par=3D0x809
ated firewall...
[  OK  ] Listening on LVM2 poll daemon socket.
         Starting Create Static Device Nodes in /d(XEN) p2m.c:1456: d2v3:
gvirt_to_maddr failed va=3D0xffff80003df8305f flags=3D0x1 par=3D0x809
ev(XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed va=3D0xffff80003df83050
flags=3D0x1 par=3D0x809
...
[  OK  ] Created slice User and Session Slice.
[  OK  ] Reached target Slices.
[  OK  ](XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed va=3D0xffff80003df830=
5f
flags=3D0x1 par=3D0x809
 Reached target Swap.
[  OK  ] Started Forward Password Requests to Wall Directory Watch.
[  OK  ] Reac(XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed
va=3D0xffff80003df8305f flags=3D0x1 par=3D0x809
he(XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed va=3D0xffff80003df83050
flags=3D0x1 par=3D0x809
d target Paths.
         Mounting Debug File System...
[  OK  ] Listening on udev Control Socket.
         Starti(XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed
va=3D0xffff80003df8305f flags=3D0x1 par=3D0x809
ng Load Kernel Modules...
[  OK  ] Listening on Journal Socket (/dev/log).
         Starting Journal Service...
[(XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed va=3D0xffff80003df8305f
flags=3D0x1 par=3D0x809
[  266.802137] mXEN) p2m.c:1456: d2v3: gvirt_to_maddr failed
va=3D0xffff80003df83050 flags=3D0x1 par=3D0x809
mcblk0: timed ou0;32m  OK  ] Created slice system-getty.slice.
         Mounting POSIX Message Queue File System...
[  OK  ] R(XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed
va=3D0xffff80003df8305f flags=3D0x1 par=3D0x809
t sending r/w cmeached target User and Group Name Lookups.
[  OK  ] Reached target Encrypted Volumes.
[  OK  ] Listenind command, card g status 0x900
on udev Kernel Socket.
[  OK  ] Mounted Debug File System.
[  OK  ] Mounted Huge Pages File System.
[  OK  ] Mounted POSIX Message Queue File System.
[  OK  ] Started Remount Root and Kernel File Systems.
[  OK  ] Started Uncomplicated firewall.
         Starting Load/Save Random Seed...
         Starting udev Coldplug all Devices...
[  OK  ] Started Load Kernel Modules.
         Starting Apply Kernel Variables...
         Mounting Configuration File System...
[  OK  ] Mounted Configuration File System.
[  OK  ] Started Journal Service.
         Starting Flush Journal to Persistent Storage...
[  OK  ] Started Apply Kernel Variables.
[  OK  ] Started LVM2 metadata daemon.
[  OK  ] Started Load/Save Random Seed.
[  OK  ] Started udev Cold[  266.934658] mplug all Devices.
mc_host mmc0: Bus speed (slot 0) =3D 400000Hz (slot req 400000Hz, actual
400000HZ div =3D 0)
[  267.276187] dwmmc_k3 ff37f000.dwmmc1: Unexpected command timeout, state =
7
[  267.288881] mmc_host mmc0: Bus speed (slot 0) =3D 200000000Hz (slot req
200000000Hz, actual 200000000HZ div =3D 0)
[  267.679850] dwmmc_k3 ff37f000.dwmmc1: tuning ok best_clksmpl 18
tuning_sample_flag cdfff9ff
[    4.249292] systemd-journald[1503]: Received request to flush runtime
journal from PID 1
[  OK  ] Started Create Static Device Nodes in /dev.
         Starting udev Kernel Device Manager...
[  OK  ] Started Flush Journal to Persistent Storage.
[  OK  ] Started udev Kernel Device Manager.
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f
flags=3D0x1 par=3D0x809
[  OK  ] Started Monitoring of LVM2 mirrors,=E2=80=A6sing dmeventd or progr=
ess
polling.
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f
flags=3D0x1 par=3D0x809
[  OK  ] Reached target Local File Systems (Pre).
[  OK  ] Reached target Local File Systems.
         (XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed
va=3D0xffff80003df9a050 flags=3D0x1 par=3D0x809
Starting Create Volatile Files and Directories...
         Starting ebtables ruleset management...
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f
flags=3D0x1 par=3D0x809
[  OK  ] Found device /dev/hvc0.
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f
flags=3D0x1 par=3D0x809
[  268.122975] m(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed
va=3D0xffff80003df9a050 flags=3D0x1 par=3D0x809
mcblk0: timed ou(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed
va=3D0xffff80003df9a05f flags=3D0x1 par=3D0x809
t sending r/w cmd command, card status 0x900
[  268.222656] mmc_host mmc0: Bus speed (slot 0) =3D 400000Hz (slot req
400000Hz, actual 400000HZ div =3D 0)
[  268.452176] dwmmc_k3 ff37f000.dwmmc1: Unexpected command timeout, state =
7
[  268.464809] mmc_host mmc0: Bus speed (slot 0) =3D 200000000Hz (slot req
200000000Hz, actual 200000000HZ div =3D 0)
[  268.855781] dwmmc_k3 ff37f000.dwmmc1: tuning ok best_clksmpl 18
tuning_sample_flag c9fff9ff
[  OK  ] Started Create Volatile Files and Directories.
         Starting Update UTMP about System Boot/Shutdown...
         Starting Network Time Synchronization...
[  OK  ] Started Update UTMP about System Boot/Shutdown.
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
[  OK  ] Started ebtables ruleset management.
[  OK  ] Reached target Network (Pre).
         Starting Raise network interfaces...
[FAILED] Failed to start Raise network interfaces.
See 'systemctl status networking.service' for details.
[  OK  ] Started Network Time Synchronization.
[  OK  ] Reached target System Initialization.
[  OK  ] Listening on Avahi mDNS/DNS-SD Stack Activation Socket.
[  OK  ] Listening on D-Bus System Message Bus Socket.
[  OK  ] Reached target Sockets.
[XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v5: gvirt_to_maddr failed va=3D0xffff80003dfb105f
flags=3D0x1 par=3D0x809
2m(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v5: gvirt_to_maddr failed va=3D0xffff80003dfb1050
flags=3D0x1 par=3D0x809
  OK  ] Started Daily Cleanup of Temporary Directories.
[  OK  ] Reached target Basic System.
         Startin(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed
va=3D0xffff80003df6c05f flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v5: gvirt_to_maddr failed va=3D0xffff80003dfb105f
flags=3D0x1 par=3D0x809
g xendeamon.service...
         Starting Login Service...
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v5: gvirt_to_maddr failed va=3D0xffff80003dfb105f
flags=3D0x1 par=3D0x809
[  OK  ] Started Regular background program processing daemon.
         Starting Accounts Service...
         Star(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed
va=3D0xffff80003df6c050 flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v5: gvirt_to_maddr failed va=3D0xffff80003dfb1050
flags=3D0x1 par=3D0x809
ting LSB: Speech Dispatcher...
         Starting LSB: Start/stop xen-watchdog...
         Starting LSB: Start/stop xenstored (XEN) p2m.c:1456: d2v2:
gvirt_to_maddr failed va=3D0xffff80003df6c05f flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v5: gvirt_to_maddr failed va=3D0xffff80003dfb105f
flags=3D0x1 par=3D0x809
an(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
d xenconsoled...
         Starting System Logging Service...
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050
flags=3D0x1 par=3D0x809
         Starting Avahi mDNS/DNS-SD Stack...
[  OK  ] Started D-Bus System Message Bus.
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
[  OK  ] Started Avahi mDNS/DNS-SD Stack.
         Starting Network Manager...
[  OK  ] Reached target System Time Synchronized.
[  OK  ] Started Daily apt download activities.
[  OK  ] Started Daily apt upgrade and clean activities.(XEN) p2m.c:1456:
d2v1: gvirt_to_maddr failed va=3D0xffff80003df5505f flags=3D0x1 par=3D0x809

[  OK  ] Started Trigger anacron every hour.
[  OK  ] Reached target Timers.
[  OK  ] Star(XEN) p2m.c:1456: d2v1: gvirt_to_maddr failed
va=3D0xffff80003df55050 flags=3D0x1 par=3D0x809
te(XEN) p2m.c:1456: d2v1: gvirt_to_maddr failed va=3D0xffff80003df5505f
flags=3D0x1 par=3D0x809
d Run anacron jobs.
(XEN) p2m.c:1456: d2v1: gvirt_to_maddr failed va=3D0xffff80003df5505f
flags=3D0x1 par=3D0x809
[  269.705640] m[  OK  ] Started System Logging Service.
(XEN) p2m.c:1456: d2v1: gvirt_to_maddr failed va=3D0xffff80003df55050
flags=3D0x1 par=3D0x809
mcblk0: timed ou(XEN) p2m.c:1456: d2v1: gvirt_to_maddr failed
va=3D0xffff80003df5505f flags=3D0x1 par=3D0x809
t sending r/w cm[FAILED] Failed to start xendeamon.service.
See 'systemctl status xendeamon.service' for details.
d command, card [  OK  ] Started LSB: Start/stop xenstored and xenconsoled.
status 0x900
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f
flags=3D0x1 par=3D0x809
[  OK  ] Started Login Service.
(XEN) p2m.c:1456: d2v5: gvirt_to_maddr failed va=3D0xffff80003dfb105f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc8050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v5: gvirt_to_maddr failed va=3D0xffff80003dfb1050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v5: gvirt_to_maddr failed va=3D0xffff80003dfb105f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f
flags=3D0x1 par=3D0x809
         Starting LSB: Wrapper to start/stop secondary xen domains...
(XEN) p2m.c:1456: d2v5: gvirt_to_maddr failed va=3D0xffff80003dfb105f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc8050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v5: gvirt_to_maddr failed va=3D0xffff80003dfb1050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v5: gvirt_to_maddr failed va=3D0xffff80003dfb105f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f
flags=3D0x1 par=3D0x809
[  269.863692] m(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed
va=3D0xffff80003dfc8050 flags=3D0x1 par=3D0x809
mc_host mmc0: Bu(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed
va=3D0xffff80003dfc805f flags=3D0x1 par=3D0x809
s speed (slot 0)(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed
va=3D0xffff80003dfc805f flags=3D0x1 par=3D0x809
 =3D 400000Hz (slo(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed
va=3D0xffff80003dfc8050 flags=3D0x1 par=3D0x809
t req 400000Hz, (XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed
va=3D0xffff80003dfc805f flags=3D0x1 par=3D0x809
actual 400000HZ div =3D 0)
[  270.140189] dwmmc_k3 ff37f000.dwmmc1: Unexpected command timeout, state =
7
[  270.152889] mmc_host mmc0: Bus speed (slot 0) =3D 200000000Hz (slot req
200000000Hz, actual 200000000HZ div =3D 0)
[  270.543959] dwmmc_k3 ff37f000.dwmmc1: tuning ok best_clksmpl 18
tuning_sample_flag c9fff9ff
[  OK  ] Started LSB: Speech Dispatcher.
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc8050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc8050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc8050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f
flags=3D0x1 par=3D0x809
[  OK  ] Started LSB: Start/stop xen-watchdog.
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc8050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc8050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc8050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f
flags=3D0x1 par=3D0x809
[  OK  ] Started LSB: Wrapper to start/stop secondary xen domains.
         Starting Authorization Manager...
(XEN) p2m.c:1456: d2v0: gvirt_to_maddr failed va=3D0xffff80003df3e05f
flags=3D0x1 par=3D0x809
[  OK  ] Started Authorization Manager.
(XEN) p2m.c:1456: d2v0: gvirt_to_maddr failed va=3D0xffff80003df3e050
flags=3D0x1 par=3D0x809
[  OK  ] Started Accounts Service.
(XEN) p2m.c:1456: d2v0: gvirt_to_maddr failed va=3D0xffff80003df3e05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v0: gvirt_to_maddr failed va=3D0xffff80003df3e05f
flags=3D0x1 par=3D0x809
[  271.237540] m(XEN) p2m.c:1456: d2v0: gvirt_to_maddr failed
va=3D0xffff80003df3e050 flags=3D0x1 par=3D0x809
mcblk0: timed ou(XEN) p2m.c:1456: d2v0: gvirt_to_maddr failed
va=3D0xffff80003df3e05f flags=3D0x1 par=3D0x809
t sending r/w cmd command, card status 0x900
[  271.334639] mmc_host mmc0: Bus speed (slot 0) =3D 400000Hz (slot req
400000Hz, actual 400000HZ div =3D 0)
[  271.564175] dwmmc_k3 ff37f000.dwmmc1: Unexpected command timeout, state =
7
[  271.576795] mmc_host mmc0: Bus speed (slot 0) =3D 200000000Hz (slot req
200000000Hz, actual 200000000HZ div =3D 0)
[  271.967997] dwmmc_k3 ff37f000.dwmmc1: tuning ok best_clksmpl 18
tuning_sample_flag c9fff9ff
[  OK  ] Started Network Manager.
         Starting Network Manager Wait Online...
[  OK  ] Reached target Network.
[  OK  ] Started Unattended Upgrades Shutdown.
         Starting Permit User Sessions...
         Starting OpenBSD Secure Shell server...
[  OK  ] Started Permit User Sessions.
[  OK  ] Started Getty on tty1.
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f
flags=3D0x1 par=3D0x809
[  OK  ] Started Serial Getty on hvc0.
[  OK  ] Reached target Login Prompts.
         Starting Light D(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed
va=3D0xffff80003dfc8050 flags=3D0x1 par=3D0x809
isplay Manager...
         Starting Network Manager Script Dispatcher Service...
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v5: gvirt_to_maddr failed va=3D0xffff80003dfb105f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc8050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v5: gvirt_to_maddr failed va=3D0xffff80003dfb1050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v5: gvirt_to_maddr failed va=3D0xffff80003dfb105f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v5: gvirt_to_maddr failed va=3D0xffff80003dfb105f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf05f
flags=3D0x1 par=3D0x809
[  OK  ] Started Network Manager Script Dispatcher Service.
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc8050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v5: gvirt_to_maddr failed va=3D0xffff80003dfb1050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v5: gvirt_to_maddr failed va=3D0xffff80003dfb105f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f
flags=3D0x1 par=3D0x809
[  OK  ] Started OpenBSD Secure Shell server.
(XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed va=3D0xffff80003df8305f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc8050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed va=3D0xffff80003df83050
flags=3D0x1 par=3D0x809
[  OK  ] Started Light Display Manager.
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed va=3D0xffff80003df8305f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed va=3D0xffff80003df8305f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed va=3D0xffff80003df83050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed va=3D0xffff80003df8305f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed va=3D0xffff80003df8305f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed va=3D0xffff80003df83050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed va=3D0xffff80003df8305f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed va=3D0xffff80003df8305f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed va=3D0xffff80003df83050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed va=3D0xffff80003df8305f
flags=3D0x1 par=3D0x809
[  OK  ] Stopped Light Display Manager.
         Starting Light Display Manager...
         Starting Hostname Service...
[  OK  ] Started Light Display Manager.
[  OK  ] Started Hostname Service.
[  OK  ] Started Network Manager Wait Online.
(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc8050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf05f
flags=3D0x1 par=3D0x809
[  OK  ] Reached target Network is Online.
         Starting LSB: Advanced IEEE 802.11 management daemon...
      (XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf050
flags=3D0x1 par=3D0x809
   Starting LSB: Starts or stops the xinetd daemon....
[  OK  ] Stopped Light Display Manager.
         Starting L(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed
va=3D0xffff80003dfc8050 flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf05f
flags=3D0x1 par=3D0x809
ig(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf05f
flags=3D0x1 par=3D0x809
ht Display Manager...
[  OK  ] Started Light Display Manager.
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf050
flags=3D0x1 par=3D0x809
[  OK  ] Started LSB: Advanced IEEE 802.11 management daemon.
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050
flags=3D0x1 par=3D0x809
[  OK  ] Started LSB: Starts or stops the xinetd daemon..
(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
[  OK  ] Reached target Multi-User System.
[  OK  ] Reached target Graphical Interface.
(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f
flags=3D0x1 par=3D0x809
         Starting Update UTMP about System Runlevel Changes...
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f
flags=3D0x1 par=3D0x809
[  OK  ] Started Update UTMP about System Runlevel Changes.
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a050
flags=3D0x1 par=3D0x809
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f
flags=3D0x1 par=3D0x809


--=20
Thanks & Regards
Vikram KS

--=20






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message contains confidential information and is intended only=20
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prohibited. Please notify the
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Content-Type: text/html; charset="UTF-8"
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<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div>Hello,</div><div><b=
r></div><div>When PV DRM is enabled and Domain-U is started xen is not able=
 to converted virtual address to physical. Please provide input on resolvin=
g this issue.</div><div><br></div><div>Please find the details below.<br></=
div><ul><li>We are using 64 bit arm platform. <br></li><li>Linux 4.20 Kerne=
l in DomU with PV DRM front-end drivers. </li><li>Xen-4.12 unstable version=
. </li><li>Able to build displ_be application and also its dependencies.</l=
i></ul><div>Added below configuration in Domain-U config file.<font size=3D=
"2"><span style=3D"font-family:arial,helvetica,sans-serif"><b><code><br></c=
ode></b></span></font></div><div><span style=3D"font-family:arial black,san=
s-serif"><font size=3D"2"><b><code>vdispl =3D [ &#39;backend=3DDomD,be-allo=
c=3D0,connectors=3DHDMI-A-1:1920x1080&#39;]</code></b></font></span></div><=
div></div><div><br></div><div>Before launching the application ran the disp=
l_be application in the background.</div><div>=C2=A0$ displ_be -m DRM -v *:=
Debug</div><div><br></div><div>Started Domain-U.</div><div>$ xl create -c d=
ebian.cfg</div><div><br></div><div>Getting below logs.</div><div>Welcome to=
 Debian GNU/Linux 9 (stretch)!<br><br>(XEN) p2m.c:1456: d2v2: gvirt_to_madd=
r failed va=3D0xffff80003df6c050 flags=3D0x1 par=3D0x809<br>[=C2=A0=C2=A0=
=C2=A0 2.601162] systemd[1]: Set hostname to &lt;hikey960&gt;.<br>[=C2=A0=
=C2=A0=C2=A0 2.613526] random: systemd: uninitialized urandom read (16 byte=
s re(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f f=
lags=3D0x1 par=3D0x809<br>ad)<br>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr fai=
led va=3D0xffff80003df6c05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2=
v2: gvirt_to_maddr failed va=3D0xffff80003df6c050 flags=3D0x1 par=3D0x809<b=
r>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f fla=
gs=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D=
0xffff80003df6c05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v2: gvirt=
_to_maddr failed va=3D0xffff80003df6c050 flags=3D0x1 par=3D0x809<br>(XEN) p=
2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f flags=3D0x1 =
par=3D0x809<br>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff800=
03df6c05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr=
 failed va=3D0xffff80003df6c050 flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456=
: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f flags=3D0x1 par=3D0x8=
09<br>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f=
 flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed v=
a=3D0xffff80003df6c050 flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v2: g=
virt_to_maddr failed va=3D0xffff80003df6c05f flags=3D0x1 par=3D0x809<br>(XE=
N) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f flags=3D=
0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xfff=
f80003df6c050 flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v2: gvirt_to_m=
addr failed va=3D0xffff80003df6c05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:=
1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f flags=3D0x1 par=
=3D0x809<br>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003d=
f6c050 flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr fa=
iled va=3D0xffff80003df6c05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d=
2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f flags=3D0x1 par=3D0x809<=
br>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050 fl=
ags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=
=3D0xffff80003df6c05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v2: gv=
irt_to_maddr failed va=3D0xffff80003df6c05f flags=3D0x1 par=3D0x809<br>(XEN=
) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050 flags=3D0=
x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff=
80003df6c05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v2: gvirt_to_ma=
ddr failed va=3D0xffff80003df6c05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1=
456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050 flags=3D0x1 par=3D=
0x809<br>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c=
05f flags=3D0x1 par=3D0x809<br>[=C2=A0=C2=A0=C2=A0 3.006492] systemd[1]: Re=
ached target Remote File Systems.<br>[=C2=A0 OK=C2=A0 ] Reached target Remo=
te File Systems.<br>[=C2=A0=C2=A0=C2=A0 3.007179] systemd[1]: Started Dispa=
tch Password Requests to Console Directory Watch.<br>[=C2=A0 OK=C2=A0 ] Sta=
rted Dispatch Password Requests to Console Directory Watch.<br>[=C2=A0=C2=
=A0=C2=A0 3.007477] systemd[1]: Listening on Journal Socket.<br>[=C2=A0 OK=
=C2=A0 ] Listening on Journal Socket.<br>[=C2=A0=C2=A0=C2=A0 3.007742] syst=
emd[1]: Listening on LVM2 metadata daemon socket.<br>[=C2=A0 OK=C2=A0 ] Lis=
tening on LVM2 metadata daemon socket.<br>[=C2=A0=C2=A0=C2=A0 3.007966] sys=
temd[1]: Listening on Device-mapper event daemon FIFOs.<br>[=C2=A0 OK=C2=A0=
 ] Listening on Device-mapper event daemon FIFOs.<br>[=C2=A0=C2=A0=C2=A0 3.=
008161] systemd[1]: Listening on Syslog Socket.<br>[=C2=A0 OK=C2=A0 ] Liste=
ning on Syslog Socket.<br>[=C2=A0 OK=C2=A0 ] Listening on Journal Audit Soc=
ket.<br>[=C2=A0 OK=C2=A0 ] Listening on /dev/initctl Compatibility Named Pi=
pe.<br>[=C2=A0 OK=C2=A0 ] Created slice System Slice.<br>=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Starting Remount Root and Kernel File System=
s...<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Starting Monitorin=
g of LVM2 mirrors=E2=80=A6ng dmeventd or progress polling...<br>[(XEN) p2m.=
c:1456: d2v3: gvirt_to_maddr failed va=3D0xffff80003df8305f flags=3D0x1 par=
=3D0x809<br>=C2=A0 (XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed va=3D0xfff=
f80003df83050 flags=3D0x1 par=3D0x809<br>OK=C2=A0 ] Created slice system-se=
rial\x2dgetty.slice.<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Mo=
unting Huge Pages File System...<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 Starting Uncomplic(XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed v=
a=3D0xffff80003df8305f flags=3D0x1 par=3D0x809<br>ated firewall...<br>[=C2=
=A0 OK=C2=A0 ] Listening on LVM2 poll daemon socket.<br>=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Starting Create Static Device Nodes in /d(XE=
N) p2m.c:1456: d2v3: gvirt_to_maddr failed va=3D0xffff80003df8305f flags=3D=
0x1 par=3D0x809<br>ev(XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed va=3D0xf=
fff80003df83050 flags=3D0x1 par=3D0x809<br>...<br>[=C2=A0 OK=C2=A0 ] Create=
d slice User and Session Slice.<br>[=C2=A0 OK=C2=A0 ] Reached target Slices=
.<br>[=C2=A0 OK=C2=A0 ](XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed va=3D0=
xffff80003df8305f flags=3D0x1 par=3D0x809<br>=C2=A0Reached target Swap.<br>=
[=C2=A0 OK=C2=A0 ] Started Forward Password Requests to Wall Directory Watc=
h.<br>[=C2=A0 OK=C2=A0 ] Reac(XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed =
va=3D0xffff80003df8305f flags=3D0x1 par=3D0x809<br>he(XEN) p2m.c:1456: d2v3=
: gvirt_to_maddr failed va=3D0xffff80003df83050 flags=3D0x1 par=3D0x809<br>=
d target Paths.<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Mountin=
g Debug File System...<br>[=C2=A0 OK=C2=A0 ] Listening on udev Control Sock=
et.<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Starti(XEN) p2m.c:1=
456: d2v3: gvirt_to_maddr failed va=3D0xffff80003df8305f flags=3D0x1 par=3D=
0x809<br>ng Load Kernel Modules...<br>[=C2=A0 OK=C2=A0 ] Listening on Journ=
al Socket (/dev/log).<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 S=
tarting Journal Service...<br>[(XEN) p2m.c:1456: d2v3: gvirt_to_maddr faile=
d va=3D0xffff80003df8305f flags=3D0x1 par=3D0x809<br>[=C2=A0 266.802137] mX=
EN) p2m.c:1456: d2v3: gvirt_to_maddr failed va=3D0xffff80003df83050 flags=
=3D0x1 par=3D0x809<br>mcblk0: timed ou0;32m=C2=A0 OK=C2=A0 ] Created slice =
system-getty.slice.<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Mou=
nting POSIX Message Queue File System...<br>[=C2=A0 OK=C2=A0 ] R(XEN) p2m.c=
:1456: d2v3: gvirt_to_maddr failed va=3D0xffff80003df8305f flags=3D0x1 par=
=3D0x809<br>t sending r/w cmeached target User and Group Name Lookups.<br>[=
=C2=A0 OK=C2=A0 ] Reached target Encrypted Volumes.<br>[=C2=A0 OK=C2=A0 ] L=
istenind command, card g status 0x900<br>on udev Kernel Socket.<br>[=C2=A0 =
OK=C2=A0 ] Mounted Debug File System.<br>[=C2=A0 OK=C2=A0 ] Mounted Huge Pa=
ges File System.<br>[=C2=A0 OK=C2=A0 ] Mounted POSIX Message Queue File Sys=
tem.<br>[=C2=A0 OK=C2=A0 ] Started Remount Root and Kernel File Systems.<br=
>[=C2=A0 OK=C2=A0 ] Started Uncomplicated firewall.<br>=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Starting Load/Save Random Seed...<br>=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Starting udev Coldplug all Devic=
es...<br>[=C2=A0 OK=C2=A0 ] Started Load Kernel Modules.<br>=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Starting Apply Kernel Variables...<br>=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Mounting Configuration File S=
ystem...<br>[=C2=A0 OK=C2=A0 ] Mounted Configuration File System.<br>[=C2=
=A0 OK=C2=A0 ] Started Journal Service.<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 Starting Flush Journal to Persistent Storage...<br>[=C2=
=A0 OK=C2=A0 ] Started Apply Kernel Variables.<br>[=C2=A0 OK=C2=A0 ] Starte=
d LVM2 metadata daemon.<br>[=C2=A0 OK=C2=A0 ] Started Load/Save Random Seed=
.<br>[=C2=A0 OK=C2=A0 ] Started udev Cold[=C2=A0 266.934658] mplug all Devi=
ces.<br>mc_host mmc0: Bus speed (slot 0) =3D 400000Hz (slot req 400000Hz, a=
ctual 400000HZ div =3D 0)<br>[=C2=A0 267.276187] dwmmc_k3 ff37f000.dwmmc1: =
Unexpected command timeout, state 7<br>[=C2=A0 267.288881] mmc_host mmc0: B=
us speed (slot 0) =3D 200000000Hz (slot req 200000000Hz, actual 200000000HZ=
 div =3D 0)<br>[=C2=A0 267.679850] dwmmc_k3 ff37f000.dwmmc1: tuning ok best=
_clksmpl 18 tuning_sample_flag cdfff9ff<br>[=C2=A0=C2=A0=C2=A0 4.249292] sy=
stemd-journald[1503]: Received request to flush runtime journal from PID 1<=
br>[=C2=A0 OK=C2=A0 ] Started Create Static Device Nodes in /dev.<br>=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Starting udev Kernel Device Mana=
ger...<br>[=C2=A0 OK=C2=A0 ] Started Flush Journal to Persistent Storage.<b=
r>[=C2=A0 OK=C2=A0 ] Started udev Kernel Device Manager.<br>(XEN) p2m.c:145=
6: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f flags=3D0x1 par=3D0x=
809<br>(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05=
0 flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed =
va=3D0xffff80003df9a05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v4: =
gvirt_to_maddr failed va=3D0xffff80003df9a05f flags=3D0x1 par=3D0x809<br>(X=
EN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a050 flags=
=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0x=
ffff80003df9a05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v4: gvirt_t=
o_maddr failed va=3D0xffff80003df9a05f flags=3D0x1 par=3D0x809<br>(XEN) p2m=
.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a050 flags=3D0x1 pa=
r=3D0x809<br>(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003=
df9a05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v4: gvirt_to_maddr f=
ailed va=3D0xffff80003df9a05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: =
d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a050 flags=3D0x1 par=3D0x809=
<br>(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f f=
lags=3D0x1 par=3D0x809<br>[=C2=A0 OK=C2=A0 ] Started Monitoring of LVM2 mir=
rors,=E2=80=A6sing dmeventd or progress polling.<br>(XEN) p2m.c:1456: d2v4:=
 gvirt_to_maddr failed va=3D0xffff80003df9a05f flags=3D0x1 par=3D0x809<br>[=
=C2=A0 OK=C2=A0 ] Reached target Local File Systems (Pre).<br>[=C2=A0 OK=C2=
=A0 ] Reached target Local File Systems.<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 (XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xfff=
f80003df9a050 flags=3D0x1 par=3D0x809<br>Starting Create Volatile Files and=
 Directories...<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Startin=
g ebtables ruleset management...<br>(XEN) p2m.c:1456: d2v4: gvirt_to_maddr =
failed va=3D0xffff80003df9a05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456:=
 d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f flags=3D0x1 par=3D0x80=
9<br>(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a050 =
flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=
=3D0xffff80003df9a05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v4: gv=
irt_to_maddr failed va=3D0xffff80003df9a05f flags=3D0x1 par=3D0x809<br>[=C2=
=A0 OK=C2=A0 ] Found device /dev/hvc0.<br>(XEN) p2m.c:1456: d2v4: gvirt_to_=
maddr failed va=3D0xffff80003df9a050 flags=3D0x1 par=3D0x809<br>(XEN) p2m.c=
:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f flags=3D0x1 par=
=3D0x809<br>(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003d=
f9a05f flags=3D0x1 par=3D0x809<br>[=C2=A0 268.122975] m(XEN) p2m.c:1456: d2=
v4: gvirt_to_maddr failed va=3D0xffff80003df9a050 flags=3D0x1 par=3D0x809<b=
r>mcblk0: timed ou(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff=
80003df9a05f flags=3D0x1 par=3D0x809<br>t sending r/w cmd command, card sta=
tus 0x900<br>[=C2=A0 268.222656] mmc_host mmc0: Bus speed (slot 0) =3D 4000=
00Hz (slot req 400000Hz, actual 400000HZ div =3D 0)<br>[=C2=A0 268.452176] =
dwmmc_k3 ff37f000.dwmmc1: Unexpected command timeout, state 7<br>[=C2=A0 26=
8.464809] mmc_host mmc0: Bus speed (slot 0) =3D 200000000Hz (slot req 20000=
0000Hz, actual 200000000HZ div =3D 0)<br>[=C2=A0 268.855781] dwmmc_k3 ff37f=
000.dwmmc1: tuning ok best_clksmpl 18 tuning_sample_flag c9fff9ff<br>[=C2=
=A0 OK=C2=A0 ] Started Create Volatile Files and Directories.<br>=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Starting Update UTMP about System B=
oot/Shutdown...<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Startin=
g Network Time Synchronization...<br>[=C2=A0 OK=C2=A0 ] Started Update UTMP=
 about System Boot/Shutdown.<br>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr fail=
ed va=3D0xffff80003df6c05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v=
2: gvirt_to_maddr failed va=3D0xffff80003df6c050 flags=3D0x1 par=3D0x809<br=
>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f flag=
s=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0=
xffff80003df6c05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v2: gvirt_=
to_maddr failed va=3D0xffff80003df6c050 flags=3D0x1 par=3D0x809<br>(XEN) p2=
m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f flags=3D0x1 p=
ar=3D0x809<br>[=C2=A0 OK=C2=A0 ] Started ebtables ruleset management.<br>[=
=C2=A0 OK=C2=A0 ] Reached target Network (Pre).<br>=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 Starting Raise network interfaces...<br>[FAILED] F=
ailed to start Raise network interfaces.<br>See &#39;systemctl status netwo=
rking.service&#39; for details.<br>[=C2=A0 OK=C2=A0 ] Started Network Time =
Synchronization.<br>[=C2=A0 OK=C2=A0 ] Reached target System Initialization=
.<br>[=C2=A0 OK=C2=A0 ] Listening on Avahi mDNS/DNS-SD Stack Activation Soc=
ket.<br>[=C2=A0 OK=C2=A0 ] Listening on D-Bus System Message Bus Socket.<br=
>[=C2=A0 OK=C2=A0 ] Reached target Sockets.<br>[XEN) p2m.c:1456: d2v2: gvir=
t_to_maddr failed va=3D0xffff80003df6c05f flags=3D0x1 par=3D0x809<br>(XEN) =
p2m.c:1456: d2v5: gvirt_to_maddr failed va=3D0xffff80003dfb105f flags=3D0x1=
 par=3D0x809<br>2m(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff=
80003df6c050 flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v5: gvirt_to_ma=
ddr failed va=3D0xffff80003dfb1050 flags=3D0x1 par=3D0x809<br>=C2=A0 OK=C2=
=A0 ] Started Daily Cleanup of Temporary Directories.<br>[=C2=A0 OK=C2=A0 ]=
 Reached target Basic System.<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 Startin(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff8000=
3df6c05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v5: gvirt_to_maddr =
failed va=3D0xffff80003dfb105f flags=3D0x1 par=3D0x809<br>g xendeamon.servi=
ce...<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Starting Login Se=
rvice...<br>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003d=
f6c05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v5: gvirt_to_maddr fa=
iled va=3D0xffff80003dfb105f flags=3D0x1 par=3D0x809<br>[=C2=A0 OK=C2=A0 ] =
Started Regular background program processing daemon.<br>=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Starting Accounts Service...<br>=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Star(XEN) p2m.c:1456: d2v2: gvirt_to_m=
addr failed va=3D0xffff80003df6c050 flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:=
1456: d2v5: gvirt_to_maddr failed va=3D0xffff80003dfb1050 flags=3D0x1 par=
=3D0x809<br>ting LSB: Speech Dispatcher...<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 Starting LSB: Start/stop xen-watchdog...<br>=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Starting LSB: Start/stop xenstored =
(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f flags=
=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v5: gvirt_to_maddr failed va=3D0x=
ffff80003dfb105f flags=3D0x1 par=3D0x809<br>an(XEN) p2m.c:1456: d2v2: gvirt=
_to_maddr failed va=3D0xffff80003df6c05f flags=3D0x1 par=3D0x809<br>d xenco=
nsoled...<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Starting Syst=
em Logging Service...<br>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=
=3D0xffff80003df6c050 flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v2: gv=
irt_to_maddr failed va=3D0xffff80003df6c05f flags=3D0x1 par=3D0x809<br>(XEN=
) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f flags=3D0=
x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff=
80003df6c050 flags=3D0x1 par=3D0x809<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 Starting Avahi mDNS/DNS-SD Stack...<br>[=C2=A0 OK=C2=A0 ] S=
tarted D-Bus System Message Bus.<br>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr =
failed va=3D0xffff80003df6c05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456:=
 d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f flags=3D0x1 par=3D0x80=
9<br>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050 =
flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=
=3D0xffff80003df6c05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v2: gv=
irt_to_maddr failed va=3D0xffff80003df6c05f flags=3D0x1 par=3D0x809<br>(XEN=
) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050 flags=3D0=
x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff=
80003df6c05f flags=3D0x1 par=3D0x809<br>[=C2=A0 OK=C2=A0 ] Started Avahi mD=
NS/DNS-SD Stack.<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Starti=
ng Network Manager...<br>[=C2=A0 OK=C2=A0 ] Reached target System Time Sync=
hronized.<br>[=C2=A0 OK=C2=A0 ] Started Daily apt download activities.<br>[=
=C2=A0 OK=C2=A0 ] Started Daily apt upgrade and clean activities.(XEN) p2m.=
c:1456: d2v1: gvirt_to_maddr failed va=3D0xffff80003df5505f flags=3D0x1 par=
=3D0x809<br><br>[=C2=A0 OK=C2=A0 ] Started Trigger anacron every hour.<br>[=
=C2=A0 OK=C2=A0 ] Reached target Timers.<br>[=C2=A0 OK=C2=A0 ] Star(XEN) p2=
m.c:1456: d2v1: gvirt_to_maddr failed va=3D0xffff80003df55050 flags=3D0x1 p=
ar=3D0x809<br>te(XEN) p2m.c:1456: d2v1: gvirt_to_maddr failed va=3D0xffff80=
003df5505f flags=3D0x1 par=3D0x809<br>d Run anacron jobs.<br>(XEN) p2m.c:14=
56: d2v1: gvirt_to_maddr failed va=3D0xffff80003df5505f flags=3D0x1 par=3D0=
x809<br>[=C2=A0 269.705640] m[=C2=A0 OK=C2=A0 ] Started System Logging Serv=
ice.<br>(XEN) p2m.c:1456: d2v1: gvirt_to_maddr failed va=3D0xffff80003df550=
50 flags=3D0x1 par=3D0x809<br>mcblk0: timed ou(XEN) p2m.c:1456: d2v1: gvirt=
_to_maddr failed va=3D0xffff80003df5505f flags=3D0x1 par=3D0x809<br>t sendi=
ng r/w cm[FAILED] Failed to start xendeamon.service.<br>See &#39;systemctl =
status xendeamon.service&#39; for details.<br>d command, card [=C2=A0 OK=C2=
=A0 ] Started LSB: Start/stop xenstored and xenconsoled.<br>status 0x900<br=
>(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f flag=
s=3D0x1 par=3D0x809<br>[=C2=A0 OK=C2=A0 ] Started Login Service.<br>(XEN) p=
2m.c:1456: d2v5: gvirt_to_maddr failed va=3D0xffff80003dfb105f flags=3D0x1 =
par=3D0x809<br>(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff800=
03dfc8050 flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v5: gvirt_to_maddr=
 failed va=3D0xffff80003dfb1050 flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456=
: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f flags=3D0x1 par=3D0x8=
09<br>(XEN) p2m.c:1456: d2v5: gvirt_to_maddr failed va=3D0xffff80003dfb105f=
 flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed v=
a=3D0xffff80003dfc805f flags=3D0x1 par=3D0x809<br>=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 Starting LSB: Wrapper to start/stop secondary xen =
domains...<br>(XEN) p2m.c:1456: d2v5: gvirt_to_maddr failed va=3D0xffff8000=
3dfb105f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v6: gvirt_to_maddr =
failed va=3D0xffff80003dfc8050 flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456:=
 d2v5: gvirt_to_maddr failed va=3D0xffff80003dfb1050 flags=3D0x1 par=3D0x80=
9<br>(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f =
flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v5: gvirt_to_maddr failed va=
=3D0xffff80003dfb105f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v6: gv=
irt_to_maddr failed va=3D0xffff80003dfc805f flags=3D0x1 par=3D0x809<br>[=C2=
=A0 269.863692] m(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff8=
0003dfc8050 flags=3D0x1 par=3D0x809<br>mc_host mmc0: Bu(XEN) p2m.c:1456: d2=
v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f flags=3D0x1 par=3D0x809<b=
r>s speed (slot 0)(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff=
80003dfc805f flags=3D0x1 par=3D0x809<br>=C2=A0=3D 400000Hz (slo(XEN) p2m.c:=
1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc8050 flags=3D0x1 par=
=3D0x809<br>t req 400000Hz, (XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed v=
a=3D0xffff80003dfc805f flags=3D0x1 par=3D0x809<br>actual 400000HZ div =3D 0=
)<br>[=C2=A0 270.140189] dwmmc_k3 ff37f000.dwmmc1: Unexpected command timeo=
ut, state 7<br>[=C2=A0 270.152889] mmc_host mmc0: Bus speed (slot 0) =3D 20=
0000000Hz (slot req 200000000Hz, actual 200000000HZ div =3D 0)<br>[=C2=A0 2=
70.543959] dwmmc_k3 ff37f000.dwmmc1: tuning ok best_clksmpl 18 tuning_sampl=
e_flag c9fff9ff<br>[=C2=A0 OK=C2=A0 ] Started LSB: Speech Dispatcher.<br>(X=
EN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f flags=
=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0x=
ffff80003dfc8050 flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v6: gvirt_t=
o_maddr failed va=3D0xffff80003dfc805f flags=3D0x1 par=3D0x809<br>(XEN) p2m=
.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f flags=3D0x1 pa=
r=3D0x809<br>(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003=
dfc8050 flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v6: gvirt_to_maddr f=
ailed va=3D0xffff80003dfc805f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: =
d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f flags=3D0x1 par=3D0x809=
<br>(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc8050 f=
lags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=
=3D0xffff80003dfc805f flags=3D0x1 par=3D0x809<br>[=C2=A0 OK=C2=A0 ] Started=
 LSB: Start/stop xen-watchdog.<br>(XEN) p2m.c:1456: d2v6: gvirt_to_maddr fa=
iled va=3D0xffff80003dfc805f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d=
2v6: gvirt_to_maddr failed va=3D0xffff80003dfc8050 flags=3D0x1 par=3D0x809<=
br>(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f fl=
ags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=
=3D0xffff80003dfc805f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v6: gv=
irt_to_maddr failed va=3D0xffff80003dfc8050 flags=3D0x1 par=3D0x809<br>(XEN=
) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f flags=3D0=
x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff=
80003dfc805f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v6: gvirt_to_ma=
ddr failed va=3D0xffff80003dfc8050 flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1=
456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f flags=3D0x1 par=3D=
0x809<br>[=C2=A0 OK=C2=A0 ] Started LSB: Wrapper to start/stop secondary xe=
n domains.<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Starting Aut=
horization Manager...<br>(XEN) p2m.c:1456: d2v0: gvirt_to_maddr failed va=
=3D0xffff80003df3e05f flags=3D0x1 par=3D0x809<br>[=C2=A0 OK=C2=A0 ] Started=
 Authorization Manager.<br>(XEN) p2m.c:1456: d2v0: gvirt_to_maddr failed va=
=3D0xffff80003df3e050 flags=3D0x1 par=3D0x809<br>[=C2=A0 OK=C2=A0 ] Started=
 Accounts Service.<br>(XEN) p2m.c:1456: d2v0: gvirt_to_maddr failed va=3D0x=
ffff80003df3e05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v0: gvirt_t=
o_maddr failed va=3D0xffff80003df3e05f flags=3D0x1 par=3D0x809<br>[=C2=A0 2=
71.237540] m(XEN) p2m.c:1456: d2v0: gvirt_to_maddr failed va=3D0xffff80003d=
f3e050 flags=3D0x1 par=3D0x809<br>mcblk0: timed ou(XEN) p2m.c:1456: d2v0: g=
virt_to_maddr failed va=3D0xffff80003df3e05f flags=3D0x1 par=3D0x809<br>t s=
ending r/w cmd command, card status 0x900<br>[=C2=A0 271.334639] mmc_host m=
mc0: Bus speed (slot 0) =3D 400000Hz (slot req 400000Hz, actual 400000HZ di=
v =3D 0)<br>[=C2=A0 271.564175] dwmmc_k3 ff37f000.dwmmc1: Unexpected comman=
d timeout, state 7<br>[=C2=A0 271.576795] mmc_host mmc0: Bus speed (slot 0)=
 =3D 200000000Hz (slot req 200000000Hz, actual 200000000HZ div =3D 0)<br>[=
=C2=A0 271.967997] dwmmc_k3 ff37f000.dwmmc1: tuning ok best_clksmpl 18 tuni=
ng_sample_flag c9fff9ff<br>[=C2=A0 OK=C2=A0 ] Started Network Manager.<br>=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Starting Network Manager W=
ait Online...<br>[=C2=A0 OK=C2=A0 ] Reached target Network.<br>[=C2=A0 OK=
=C2=A0 ] Started Unattended Upgrades Shutdown.<br>=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 Starting Permit User Sessions...<br>=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Starting OpenBSD Secure Shell server..=
.<br>[=C2=A0 OK=C2=A0 ] Started Permit User Sessions.<br>[=C2=A0 OK=C2=A0 ]=
 Started Getty on tty1.<br>(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=
=3D0xffff80003dfc805f flags=3D0x1 par=3D0x809<br>[=C2=A0 OK=C2=A0 ] Started=
 Serial Getty on hvc0.<br>[=C2=A0 OK=C2=A0 ] Reached target Login Prompts.<=
br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Starting Light D(XEN) p=
2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc8050 flags=3D0x1 =
par=3D0x809<br>isplay Manager...<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 Starting Network Manager Script Dispatcher Service...<br>(XEN) p2=
m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f flags=3D0x1 p=
ar=3D0x809<br>(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff8000=
3dfc805f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v5: gvirt_to_maddr =
failed va=3D0xffff80003dfb105f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456:=
 d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf05f flags=3D0x1 par=3D0x80=
9<br>(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc8050 =
flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v5: gvirt_to_maddr failed va=
=3D0xffff80003dfb1050 flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v7: gv=
irt_to_maddr failed va=3D0xffff80003dfdf050 flags=3D0x1 par=3D0x809<br>(XEN=
) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f flags=3D0=
x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v5: gvirt_to_maddr failed va=3D0xffff=
80003dfb105f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v7: gvirt_to_ma=
ddr failed va=3D0xffff80003dfdf05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1=
456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f flags=3D0x1 par=3D=
0x809<br>(XEN) p2m.c:1456: d2v5: gvirt_to_maddr failed va=3D0xffff80003dfb1=
05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v7: gvirt_to_maddr faile=
d va=3D0xffff80003dfdf05f flags=3D0x1 par=3D0x809<br>[=C2=A0 OK=C2=A0 ] Sta=
rted Network Manager Script Dispatcher Service.<br>(XEN) p2m.c:1456: d2v6: =
gvirt_to_maddr failed va=3D0xffff80003dfc8050 flags=3D0x1 par=3D0x809<br>(X=
EN) p2m.c:1456: d2v5: gvirt_to_maddr failed va=3D0xffff80003dfb1050 flags=
=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0x=
ffff80003dfdf050 flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v6: gvirt_t=
o_maddr failed va=3D0xffff80003dfc805f flags=3D0x1 par=3D0x809<br>(XEN) p2m=
.c:1456: d2v5: gvirt_to_maddr failed va=3D0xffff80003dfb105f flags=3D0x1 pa=
r=3D0x809<br>(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003=
dfdf05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v6: gvirt_to_maddr f=
ailed va=3D0xffff80003dfc805f flags=3D0x1 par=3D0x809<br>[=C2=A0 OK=C2=A0 ]=
 Started OpenBSD Secure Shell server.<br>(XEN) p2m.c:1456: d2v3: gvirt_to_m=
addr failed va=3D0xffff80003df8305f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:=
1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc8050 flags=3D0x1 par=
=3D0x809<br>(XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed va=3D0xffff80003d=
f83050 flags=3D0x1 par=3D0x809<br>[=C2=A0 OK=C2=A0 ] Started Light Display =
Manager.<br>(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003d=
fc805f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v3: gvirt_to_maddr fa=
iled va=3D0xffff80003df8305f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d=
2v3: gvirt_to_maddr failed va=3D0xffff80003df8305f flags=3D0x1 par=3D0x809<=
br>(XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed va=3D0xffff80003df83050 fl=
ags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed va=
=3D0xffff80003df8305f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v3: gv=
irt_to_maddr failed va=3D0xffff80003df8305f flags=3D0x1 par=3D0x809<br>(XEN=
) p2m.c:1456: d2v3: gvirt_to_maddr failed va=3D0xffff80003df83050 flags=3D0=
x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed va=3D0xffff=
80003df8305f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v3: gvirt_to_ma=
ddr failed va=3D0xffff80003df8305f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1=
456: d2v3: gvirt_to_maddr failed va=3D0xffff80003df83050 flags=3D0x1 par=3D=
0x809<br>(XEN) p2m.c:1456: d2v3: gvirt_to_maddr failed va=3D0xffff80003df83=
05f flags=3D0x1 par=3D0x809<br>[=C2=A0 OK=C2=A0 ] Stopped Light Display Man=
ager.<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Starting Light Di=
splay Manager...<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Starti=
ng Hostname Service...<br>[=C2=A0 OK=C2=A0 ] Started Light Display Manager.=
<br>[=C2=A0 OK=C2=A0 ] Started Hostname Service.<br>[=C2=A0 OK=C2=A0 ] Star=
ted Network Manager Wait Online.<br>(XEN) p2m.c:1456: d2v7: gvirt_to_maddr =
failed va=3D0xffff80003dfdf05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456:=
 d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f flags=3D0x1 par=3D0x80=
9<br>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f =
flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=
=3D0xffff80003dfdf050 flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v6: gv=
irt_to_maddr failed va=3D0xffff80003dfc8050 flags=3D0x1 par=3D0x809<br>(XEN=
) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050 flags=3D0=
x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff=
80003dfdf05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v6: gvirt_to_ma=
ddr failed va=3D0xffff80003dfc805f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1=
456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f flags=3D0x1 par=3D=
0x809<br>(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf=
05f flags=3D0x1 par=3D0x809<br>[=C2=A0 OK=C2=A0 ] Reached target Network is=
 Online.<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Starting LSB: =
Advanced IEEE 802.11 management daemon...<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
 (XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xffff80003dfc805f flag=
s=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0=
xffff80003df6c05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v7: gvirt_=
to_maddr failed va=3D0xffff80003dfdf050 flags=3D0x1 par=3D0x809<br>=C2=A0=
=C2=A0 Starting LSB: Starts or stops the xinetd daemon....<br>[=C2=A0 OK=C2=
=A0 ] Stopped Light Display Manager.<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 Starting L(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=
=3D0xffff80003dfc8050 flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v2: gv=
irt_to_maddr failed va=3D0xffff80003df6c050 flags=3D0x1 par=3D0x809<br>(XEN=
) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf05f flags=3D0=
x1 par=3D0x809<br>ig(XEN) p2m.c:1456: d2v6: gvirt_to_maddr failed va=3D0xff=
ff80003dfc805f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v2: gvirt_to_=
maddr failed va=3D0xffff80003df6c05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c=
:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf05f flags=3D0x1 par=
=3D0x809<br>ht Display Manager...<br>[=C2=A0 OK=C2=A0 ] Started Light Displ=
ay Manager.<br>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff800=
03df6c05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v7: gvirt_to_maddr=
 failed va=3D0xffff80003dfdf050 flags=3D0x1 par=3D0x809<br>[=C2=A0 OK=C2=A0=
 ] Started LSB: Advanced IEEE 802.11 management daemon.<br>(XEN) p2m.c:1456=
: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050 flags=3D0x1 par=3D0x8=
09<br>(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf05f=
 flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed v=
a=3D0xffff80003df6c05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v7: g=
virt_to_maddr failed va=3D0xffff80003dfdf05f flags=3D0x1 par=3D0x809<br>(XE=
N) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f flags=3D=
0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xfff=
f80003dfdf050 flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v2: gvirt_to_m=
addr failed va=3D0xffff80003df6c050 flags=3D0x1 par=3D0x809<br>[=C2=A0 OK=
=C2=A0 ] Started LSB: Starts or stops the xinetd daemon..<br>(XEN) p2m.c:14=
56: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf05f flags=3D0x1 par=3D0=
x809<br>(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a0=
5f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed=
 va=3D0xffff80003df6c05f flags=3D0x1 par=3D0x809<br>[=C2=A0 OK=C2=A0 ] Reac=
hed target Multi-User System.<br>[=C2=A0 OK=C2=A0 ] Reached target Graphica=
l Interface.<br>(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80=
003dfdf05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v4: gvirt_to_madd=
r failed va=3D0xffff80003df9a050 flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:145=
6: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f flags=3D0x1 par=3D0x=
809<br>(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf05=
0 flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed =
va=3D0xffff80003df9a05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v2: =
gvirt_to_maddr failed va=3D0xffff80003df6c050 flags=3D0x1 par=3D0x809<br>(X=
EN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf05f flags=
=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0x=
ffff80003df9a05f flags=3D0x1 par=3D0x809<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 Starting Update UTMP about System Runlevel Changes...<br=
>(XEN) p2m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f flag=
s=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0=
xffff80003dfdf05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v4: gvirt_=
to_maddr failed va=3D0xffff80003df9a050 flags=3D0x1 par=3D0x809<br>(XEN) p2=
m.c:1456: d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c05f flags=3D0x1 p=
ar=3D0x809<br>(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff8000=
3dfdf050 flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v4: gvirt_to_maddr =
failed va=3D0xffff80003df9a05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456:=
 d2v2: gvirt_to_maddr failed va=3D0xffff80003df6c050 flags=3D0x1 par=3D0x80=
9<br>(XEN) p2m.c:1456: d2v7: gvirt_to_maddr failed va=3D0xffff80003dfdf05f =
flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=
=3D0xffff80003df9a05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v2: gv=
irt_to_maddr failed va=3D0xffff80003df6c05f flags=3D0x1 par=3D0x809<br>(XEN=
) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a050 flags=3D0=
x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff=
80003df9a05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v4: gvirt_to_ma=
ddr failed va=3D0xffff80003df9a05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1=
456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a050 flags=3D0x1 par=3D=
0x809<br>(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a=
05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v4: gvirt_to_maddr faile=
d va=3D0xffff80003df9a05f flags=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v4=
: gvirt_to_maddr failed va=3D0xffff80003df9a050 flags=3D0x1 par=3D0x809<br>=
(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f flags=
=3D0x1 par=3D0x809<br>(XEN) p2m.c:1456: d2v4: gvirt_to_maddr failed va=3D0x=
ffff80003df9a05f flags=3D0x1 par=3D0x809<br>[=C2=A0 OK=C2=A0 ] Started Upda=
te UTMP about System Runlevel Changes.<br>(XEN) p2m.c:1456: d2v4: gvirt_to_=
maddr failed va=3D0xffff80003df9a050 flags=3D0x1 par=3D0x809<br>(XEN) p2m.c=
:1456: d2v4: gvirt_to_maddr failed va=3D0xffff80003df9a05f flags=3D0x1 par=
=3D0x809<br><br></div><div><br>-- <br><div dir=3D"ltr" class=3D"gmail_signa=
ture"><div dir=3D"ltr"><div><div dir=3D"ltr"><span>Thanks &amp; Regards<br>=
Vikram KS<br></span><span style=3D"color:rgb(19,79,92)"></span></div></div>=
</div></div></div></div></div></div>

<br>




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To: Vikram K <vikram.k@pathpartnertech.com>, xen-devel@lists.xenproject.org,
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From: Oleksandr Andrushchenko <andr2000@gmail.com>
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Subject: Re: [Xen-users] [Xen-devel] [XEN][ARM64] PV DRM failing to convert
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From: "Roalt Zijlstra | webpower" <roalt.zijlstra@webpower.nl>
Date: Tue, 18 Dec 2018 16:11:49 +0100
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To: =?UTF-8?Q?H=C3=A5kon_Alstadheim?= <hakon@alstadheim.priv.no>
Subject: Re: [Xen-users] Disk performance on guest incredibly low.
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Hi,

You are definitely running newer kernels then I do.. But I tested that with
a setting in the grub.cfg I can enable the multi-queue block mode by adding
 'scsi_mod.use_blk_mq=3D1'.
I would think that if you use 'scsi_mod.use_blk_mq=3D0' you can disable the
multi-queue block mode.
In general the multi-queue block modes should be better, but it is worth a
try in combination with Xen to test the single queue block mode.

Best regards,

  Roalt Zijlstra
    Teamleader Infra & Deliverability

  roalt.zijlstra@webpower.nl
  +31 342 423 262
  roalt.zijlstra
  https://www.webpower-group.com

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Op ma 17 dec. 2018 om 19:54 schreef H=C3=A5kon Alstadheim <
hakon@alstadheim.priv.no>:

>
> Den 17.12.2018 10:32, skrev Roalt Zijlstra | webpower:
> > Hey H=C3=A5kon,
> >
> > One little tip on disk IO in Virtual hosts, is changing the FS
> > scheduler from cfq to noop. In our Xen PV configs we add this to the
> > xen.cfg files at the end:
> >
> > extra=3D"clocksource=3Dtsc elevator=3Dnoop"
> >
> > Especially the "elevator=3Dnoop" parameter is forcing all FS-es to the
> > noop scheduler. In my experience that gave our Xenservers a pretty
> > nice boost.
> > Red Hat does recoomend this for all Virtual servers (see the link
> > below). To test this you don't need to reboot at all.
> >
> > For example from the link below there is a code snippet about getting
> > and setting the scheduler for /dev/hda. (Replace hda with sdb or any
> > other block device)
> >
> > # cat /sys/block/hda/queue/scheduler
> > noop anticipatory deadline [cfq]
> >
> > # echo 'noop' > /sys/block/hda/queue/scheduler
> > # cat /sys/block/hda/queue/scheduler
> > [noop] anticipatory deadline cfq
> >
> > More info: https://access.redhat.com/solutions/5427
>
> Yes, found that resource some time ago. Tried again now, no
> break-through. I've got 'none' available as scheduler, rather than noop,
> but they should be equal. No matter what I do (in dom0 and/or domu) I
> get at least 10 x higher speed in the dom0. :-/ .
>
> Example:
>
> ###
>
> ###In dom0, md-raid on drives f j g h i k. echo-and-cat does the obvious.
>
> ### (I usually run with mq-deadline as scheduler. seems to give
> marginally better performance)
>
> # for f in f j g h i k ; do echo-and-cat
> /sys/block/sd${f}/queue/scheduler;done
> /sys/block/sdf/queue/scheduler
> [none] mq-deadline kyber bfq
> /sys/block/sdj/queue/scheduler
> [none] mq-deadline kyber bfq
> /sys/block/sdg/queue/scheduler
> [none] mq-deadline kyber bfq
> /sys/block/sdh/queue/scheduler
> [none] mq-deadline kyber bfq
> /sys/block/sdi/queue/scheduler
> [none] mq-deadline kyber bfq
> /sys/block/sdk/queue/scheduler
> [none] mq-deadline kyber bfq
> # mount /dev/disk/by-label/SAS-STEAM /mnt/tull
> # cd /mnt/tull/tmp
> # df -hT ./
> Filesystem     Type  Size  Used Avail Use% Mounted on
> /dev/md2p8     ext4  196G  164G   23G  88% /mnt/tull
> # dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 conv=3Dfsync oflag=
=3Ddirect
> 1024+0 records in
> 1024+0 records out
> 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 4.56845 s, 235 MB/s
> 0:root@gentoo tmp # dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024
> conv=3Dfsync oflag=3Ddirect
> 1024+0 records in
> 1024+0 records out
> 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 7.52557 s, 143 MB/s
> ###
>
> ### Booting domu with root and /tmp on SAS-STEAM, ssh into domu
>
> ###
>
> # cd /tmp
> # df -hT ./
> Filsystem      Type St=C3=B8rrelse Brukt Tilgj. Bruk% Montert p=C3=A5
> /dev/xvdb      ext4      196G  163G    24G   88% /
> # cat /sys/block/xvdb/
> alignment_offset   device/            holders/ power/
> ro                 subsystem/
> bdi/               discard_alignment  inflight queue/
> size               trace/
> capability         ext_range          integrity/ range
> slaves/            uevent
> dev                hidden             mq/ removable          stat
> # cat /sys/block/xvdb/queue/scheduler
> [none] mq-deadline
> # cd /tmp
> # df -hT ./
> Filsystem      Type St=C3=B8rrelse Brukt Tilgj. Bruk% Montert p=C3=A5
> /dev/xvdb      ext4      196G  163G    24G   88% /
> # cat /sys/block/xvdb/
> alignment_offset   device/            holders/ power/
> ro                 subsystem/
> bdi/               discard_alignment  inflight queue/
> size               trace/
> capability         ext_range          integrity/ range
> slaves/            uevent
> dev                hidden             mq/ removable          stat
> # cat /sys/block/xvdb/queue/scheduler
> [none] mq-deadline
> # dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 conv=3Dfsync oflag=
=3Ddirect
> 1024+0 oppf=C3=B8ringer inn
> 1024+0 oppf=C3=B8ringer ut
> 1073741824 byte (1,1 GB, 1,0 GiB) kopiert, 64,2402 s, 16,7 MB/s
> # dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 conv=3Dfsync oflag=
=3Ddirect
> 1024+0 oppf=C3=B8ringer inn
> 1024+0 oppf=C3=B8ringer ut
> 1073741824 byte (1,1 GB, 1,0 GiB) kopiert, 59,7517 s, 18,0 MB/s
> #
>
>
>
>
>

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif;font-size:small">Hi,</div><div class=3D"gmail_default" s=
tyle=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br></div><=
div class=3D"gmail_default" style=3D""><font face=3D"arial, helvetica, sans=
-serif">You are definitely running newer kernels then I do.. But I tested t=
hat with a setting in the grub.cfg I can enable the multi-queue block mode =
by adding</font>=C2=A0&#39;scsi_mod.use_blk_mq=3D1&#39;.</div><div class=3D=
"gmail_default" style=3D"">I would think that if you use &#39;scsi_mod.use_=
blk_mq=3D0&#39; you can disable the multi-queue block mode.</div><div class=
=3D"gmail_default" style=3D"">In general the multi-queue block modes should=
 be better, but it is worth a try in combination with Xen to test the singl=
e queue block mode.</div><div class=3D"gmail_default" style=3D"font-family:=
arial,helvetica,sans-serif;font-size:small"><span style=3D"background-color=
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 style=3D"color:rgb(88,89,91);font-size:13px;line-height:16px"><font face=
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 style=3D"color:rgb(102,44,138);font-size:18px;font-weight:bold;line-height=
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ma 17 dec. 2018 om 19:54 schreef H=C3=A5kon Alstadheim &lt;<a href=3D"mailt=
o:hakon@alstadheim.priv.no">hakon@alstadheim.priv.no</a>&gt;:<br></div><blo=
ckquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left=
:1px solid rgb(204,204,204);padding-left:1ex"><br>
Den 17.12.2018 10:32, skrev Roalt Zijlstra | webpower:<br>
&gt; Hey H=C3=A5kon,<br>
&gt;<br>
&gt; One little tip on disk IO in Virtual hosts, is changing the FS <br>
&gt; scheduler from cfq to noop. In our Xen PV configs we add this to the <=
br>
&gt; xen.cfg files at the end:<br>
&gt;<br>
&gt; extra=3D&quot;clocksource=3Dtsc elevator=3Dnoop&quot;<br>
&gt;<br>
&gt; Especially the &quot;elevator=3Dnoop&quot; parameter is forcing all FS=
-es to the <br>
&gt; noop scheduler. In my experience that gave our Xenservers a pretty <br=
>
&gt; nice boost.<br>
&gt; Red Hat does recoomend this for all Virtual servers (see the link <br>
&gt; below). To test this you don&#39;t need to reboot at all.<br>
&gt;<br>
&gt; For example from the link below there is a code snippet about getting =
<br>
&gt; and setting the scheduler for /dev/hda. (Replace hda with sdb or any <=
br>
&gt; other block device)<br>
&gt;<br>
&gt; # cat /sys/block/hda/queue/scheduler<br>
&gt; noop anticipatory deadline [cfq]<br>
&gt;<br>
&gt; # echo &#39;noop&#39; &gt; /sys/block/hda/queue/scheduler<br>
&gt; # cat /sys/block/hda/queue/scheduler<br>
&gt; [noop] anticipatory deadline cfq<br>
&gt;<br>
&gt; More info: <a href=3D"https://access.redhat.com/solutions/5427" rel=3D=
"noreferrer" target=3D"_blank">https://access.redhat.com/solutions/5427</a>=
<br>
<br>
Yes, found that resource some time ago. Tried again now, no <br>
break-through. I&#39;ve got &#39;none&#39; available as scheduler, rather t=
han noop, <br>
but they should be equal. No matter what I do (in dom0 and/or domu) I <br>
get at least 10 x higher speed in the dom0. :-/ .<br>
<br>
Example:<br>
<br>
###<br>
<br>
###In dom0, md-raid on drives f j g h i k. echo-and-cat does the obvious.<b=
r>
<br>
### (I usually run with mq-deadline as scheduler. seems to give <br>
marginally better performance)<br>
<br>
# for f in f j g h i k ; do echo-and-cat <br>
/sys/block/sd${f}/queue/scheduler;done<br>
/sys/block/sdf/queue/scheduler<br>
[none] mq-deadline kyber bfq<br>
/sys/block/sdj/queue/scheduler<br>
[none] mq-deadline kyber bfq<br>
/sys/block/sdg/queue/scheduler<br>
[none] mq-deadline kyber bfq<br>
/sys/block/sdh/queue/scheduler<br>
[none] mq-deadline kyber bfq<br>
/sys/block/sdi/queue/scheduler<br>
[none] mq-deadline kyber bfq<br>
/sys/block/sdk/queue/scheduler<br>
[none] mq-deadline kyber bfq<br>
# mount /dev/disk/by-label/SAS-STEAM /mnt/tull<br>
# cd /mnt/tull/tmp<br>
# df -hT ./<br>
Filesystem=C2=A0=C2=A0=C2=A0=C2=A0 Type=C2=A0 Size=C2=A0 Used Avail Use% Mo=
unted on<br>
/dev/md2p8=C2=A0=C2=A0=C2=A0=C2=A0 ext4=C2=A0 196G=C2=A0 164G=C2=A0=C2=A0 2=
3G=C2=A0 88% /mnt/tull<br>
# dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 conv=3Dfsync oflag=3Dd=
irect<br>
1024+0 records in<br>
1024+0 records out<br>
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 4.56845 s, 235 MB/s<br>
0:root@gentoo tmp # dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 <br>
conv=3Dfsync oflag=3Ddirect<br>
1024+0 records in<br>
1024+0 records out<br>
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 7.52557 s, 143 MB/s<br>
###<br>
<br>
### Booting domu with root and /tmp on SAS-STEAM, ssh into domu<br>
<br>
###<br>
<br>
# cd /tmp<br>
# df -hT ./<br>
Filsystem=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Type St=C3=B8rrelse Brukt Tilgj. Br=
uk% Montert p=C3=A5<br>
/dev/xvdb=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ext4=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
196G=C2=A0 163G=C2=A0=C2=A0=C2=A0 24G=C2=A0=C2=A0 88% /<br>
# cat /sys/block/xvdb/<br>
alignment_offset=C2=A0=C2=A0 device/=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 holders/ power/=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 <br>
ro=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 subsystem/<br>
bdi/=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 discard_alignment=C2=A0 inflight queue/=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 <br>
size=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 trace/<br>
capability=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ext_range=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 integrity/ range=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 <br>
slaves/=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 u=
event<br>
dev=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 hidden=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 mq/ removable=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 stat<br>
# cat /sys/block/xvdb/queue/scheduler<br>
[none] mq-deadline<br>
# cd /tmp<br>
# df -hT ./<br>
Filsystem=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Type St=C3=B8rrelse Brukt Tilgj. Br=
uk% Montert p=C3=A5<br>
/dev/xvdb=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ext4=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
196G=C2=A0 163G=C2=A0=C2=A0=C2=A0 24G=C2=A0=C2=A0 88% /<br>
# cat /sys/block/xvdb/<br>
alignment_offset=C2=A0=C2=A0 device/=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 holders/ power/=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 <br>
ro=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 subsystem/<br>
bdi/=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 discard_alignment=C2=A0 inflight queue/=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 <br>
size=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 trace/<br>
capability=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ext_range=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 integrity/ range=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 <br>
slaves/=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 u=
event<br>
dev=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 hidden=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 mq/ removable=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 stat<br>
# cat /sys/block/xvdb/queue/scheduler<br>
[none] mq-deadline<br>
# dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 conv=3Dfsync oflag=3Dd=
irect<br>
1024+0 oppf=C3=B8ringer inn<br>
1024+0 oppf=C3=B8ringer ut<br>
1073741824 byte (1,1 GB, 1,0 GiB) kopiert, 64,2402 s, 16,7 MB/s<br>
# dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 conv=3Dfsync oflag=3Dd=
irect<br>
1024+0 oppf=C3=B8ringer inn<br>
1024+0 oppf=C3=B8ringer ut<br>
1073741824 byte (1,1 GB, 1,0 GiB) kopiert, 59,7517 s, 18,0 MB/s<br>
#<br>
<br>
<br>
<br>
<br>
</blockquote></div>

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Subject: Re: [Xen-users] Disk performance on guest incredibly low.
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Hi,

=20

I just run newer kernels because I hoped it would improve the IO =
performance, which apparently is not the case.

Which kernel versions are you running? Then I can try those, to see if =
that solves the problem.

=20

Best,

=20

-- Jaap

=20

Van: Xen-users <xen-users-bounces@lists.xenproject.org> Namens Roalt =
Zijlstra | webpower
Verzonden: Tuesday, 18 December 2018 16:12
Aan: H=C3=A5kon Alstadheim <hakon@alstadheim.priv.no>
CC: xen-users@lists.xenproject.org
Onderwerp: Re: [Xen-users] Disk performance on guest incredibly low.

=20

Hi,

=20

You are definitely running newer kernels then I do.. But I tested that =
with a setting in the grub.cfg I can enable the multi-queue block mode =
by adding 'scsi_mod.use_blk_mq=3D1'.

I would think that if you use 'scsi_mod.use_blk_mq=3D0' you can disable =
the multi-queue block mode.

In general the multi-queue block modes should be better, but it is worth =
a try in combination with Xen to test the single queue block mode.

=20



Best regards,


=20

=20


  <https://www.webpower.nl/signature/images/icon_user.jpg>=20

=20

Roalt Zijlstra


=20

=20

Teamleader Infra & Deliverability


=20

=20

=20


  <https://www.webpower.nl/signature/images/icon_email.jpg>=20

=20

 <mailto:roalt.zijlstra@webpower.nl> roalt.zijlstra@webpower.nl


  <https://www.webpower.nl/signature/images/icon_phone.jpg>=20

=20

+31 342 423 262


  <https://www.webpower.nl/signature/images/icon_skype.jpg>=20

=20

roalt.zijlstra


  <https://www.webpower.nl/signature/images/icon_url.jpg>=20

=20

 <https://www.webpower-group.com/> https://www.webpower-group.com


=20

	=09

=20


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=20

Op ma 17 dec. 2018 om 19:54 schreef H=C3=A5kon Alstadheim =
<hakon@alstadheim.priv.no <mailto:hakon@alstadheim.priv.no> >:


Den 17.12.2018 10:32, skrev Roalt Zijlstra | webpower:
> Hey H=C3=A5kon,
>
> One little tip on disk IO in Virtual hosts, is changing the FS=20
> scheduler from cfq to noop. In our Xen PV configs we add this to the=20
> xen.cfg files at the end:
>
> extra=3D"clocksource=3Dtsc elevator=3Dnoop"
>
> Especially the "elevator=3Dnoop" parameter is forcing all FS-es to the =

> noop scheduler. In my experience that gave our Xenservers a pretty=20
> nice boost.
> Red Hat does recoomend this for all Virtual servers (see the link=20
> below). To test this you don't need to reboot at all.
>
> For example from the link below there is a code snippet about getting=20
> and setting the scheduler for /dev/hda. (Replace hda with sdb or any=20
> other block device)
>
> # cat /sys/block/hda/queue/scheduler
> noop anticipatory deadline [cfq]
>
> # echo 'noop' > /sys/block/hda/queue/scheduler
> # cat /sys/block/hda/queue/scheduler
> [noop] anticipatory deadline cfq
>
> More info: https://access.redhat.com/solutions/5427

Yes, found that resource some time ago. Tried again now, no=20
break-through. I've got 'none' available as scheduler, rather than noop, =

but they should be equal. No matter what I do (in dom0 and/or domu) I=20
get at least 10 x higher speed in the dom0. :-/ .

Example:

###

###In dom0, md-raid on drives f j g h i k. echo-and-cat does the =
obvious.

### (I usually run with mq-deadline as scheduler. seems to give=20
marginally better performance)

# for f in f j g h i k ; do echo-and-cat=20
/sys/block/sd${f}/queue/scheduler;done
/sys/block/sdf/queue/scheduler
[none] mq-deadline kyber bfq
/sys/block/sdj/queue/scheduler
[none] mq-deadline kyber bfq
/sys/block/sdg/queue/scheduler
[none] mq-deadline kyber bfq
/sys/block/sdh/queue/scheduler
[none] mq-deadline kyber bfq
/sys/block/sdi/queue/scheduler
[none] mq-deadline kyber bfq
/sys/block/sdk/queue/scheduler
[none] mq-deadline kyber bfq
# mount /dev/disk/by-label/SAS-STEAM /mnt/tull
# cd /mnt/tull/tmp
# df -hT ./
Filesystem     Type  Size  Used Avail Use% Mounted on
/dev/md2p8     ext4  196G  164G   23G  88% /mnt/tull
# dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 conv=3Dfsync =
oflag=3Ddirect
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 4.56845 s, 235 MB/s
0:root@gentoo tmp # dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024=20
conv=3Dfsync oflag=3Ddirect
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 7.52557 s, 143 MB/s
###

### Booting domu with root and /tmp on SAS-STEAM, ssh into domu

###

# cd /tmp
# df -hT ./
Filsystem      Type St=C3=B8rrelse Brukt Tilgj. Bruk% Montert p=C3=A5
/dev/xvdb      ext4      196G  163G    24G   88% /
# cat /sys/block/xvdb/
alignment_offset   device/            holders/ power/            =20
ro                 subsystem/
bdi/               discard_alignment  inflight queue/            =20
size               trace/
capability         ext_range          integrity/ range             =20
slaves/            uevent
dev                hidden             mq/ removable          stat
# cat /sys/block/xvdb/queue/scheduler
[none] mq-deadline
# cd /tmp
# df -hT ./
Filsystem      Type St=C3=B8rrelse Brukt Tilgj. Bruk% Montert p=C3=A5
/dev/xvdb      ext4      196G  163G    24G   88% /
# cat /sys/block/xvdb/
alignment_offset   device/            holders/ power/            =20
ro                 subsystem/
bdi/               discard_alignment  inflight queue/            =20
size               trace/
capability         ext_range          integrity/ range             =20
slaves/            uevent
dev                hidden             mq/ removable          stat
# cat /sys/block/xvdb/queue/scheduler
[none] mq-deadline
# dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 conv=3Dfsync =
oflag=3Ddirect
1024+0 oppf=C3=B8ringer inn
1024+0 oppf=C3=B8ringer ut
1073741824 byte (1,1 GB, 1,0 GiB) kopiert, 64,2402 s, 16,7 MB/s
# dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 conv=3Dfsync =
oflag=3Ddirect
1024+0 oppf=C3=B8ringer inn
1024+0 oppf=C3=B8ringer ut
1073741824 byte (1,1 GB, 1,0 GiB) kopiert, 59,7517 s, 18,0 MB/s
#






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<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body lang=3Den-NL link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>Hi,<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>I just run newer kernels because I =
hoped it would improve the IO performance, which apparently is not the =
case.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>Which kernel versions are you =
running? Then I can try those, to see if that solves the =
problem.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>Best,<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>-- Jaap<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><b><span lang=3DNL>Van:</span></b><span lang=3DNL> =
Xen-users &lt;xen-users-bounces@lists.xenproject.org&gt; <b>Namens =
</b>Roalt Zijlstra | webpower<br><b>Verzonden:</b> Tuesday, 18 December =
2018 16:12<br><b>Aan:</b> H=C3=A5kon Alstadheim =
&lt;hakon@alstadheim.priv.no&gt;<br><b>CC:</b> =
xen-users@lists.xenproject.org<br><b>Onderwerp:</b> Re: [Xen-users] Disk =
performance on guest incredibly low.<o:p></o:p></span></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'>Hi,<o:p></o:p><=
/span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'><o:p>&nbsp;</o:=
p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-family:"Arial",sans-serif'>You are definitely running =
newer kernels then I do.. But I tested that with a setting in the =
grub.cfg I can enable the multi-queue block mode by =
adding</span>&nbsp;'scsi_mod.use_blk_mq=3D1'.<o:p></o:p></p></div><div><p=
 class=3DMsoNormal>I would think that if you use =
'scsi_mod.use_blk_mq=3D0' you can disable the multi-queue block =
mode.<o:p></o:p></p></div><div><p class=3DMsoNormal>In general the =
multi-queue block modes should be better, but it is worth a try in =
combination with Xen to test the single queue block =
mode.<o:p></o:p></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'><o:p>&nbsp;</o:=
p></span></p></div><div><div><div><div><div><div><div><div><div><div><div=
><div><div><div><div><div><table class=3DMsoNormalTable border=3D0 =
cellspacing=3D0 cellpadding=3D0 width=3D"100%" =
style=3D'width:100.0%'><tr><td valign=3Dtop style=3D'padding:0cm 0cm 0cm =
0cm'><table class=3DMsoNormalTable border=3D0 cellspacing=3D0 =
cellpadding=3D0 width=3D"100%" style=3D'width:100.0%'><tr><td =
valign=3Dtop style=3D'padding:0cm 0cm 0cm 0cm'><p class=3DMsoNormal =
style=3D'line-height:12.0pt'><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:#58595B'=
>Best regards,</span><span style=3D'font-size:10.0pt;font-family:"Times =
New Roman",serif;color:#58595B'><o:p></o:p></span></p></td></tr><tr><td =
width=3D20 valign=3Dtop style=3D'width:15.0pt;padding:0cm 0cm 0cm =
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nbsp;</span><span style=3D'font-size:13.5pt;font-family:"Times New =
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style=3D'padding:0cm 0cm 0cm 0cm'><p class=3DMsoNormal =
style=3D'mso-line-height-alt:12.0pt'><b><span =
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>Roalt Zijlstra</span></b><b><span =
style=3D'font-size:13.5pt;color:#662C8A'><o:p></o:p></span></b></p></td><=
/tr><tr><td width=3D20 valign=3Dtop style=3D'width:15.0pt;padding:0cm =
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ble><p class=3DMsoNormal style=3D'line-height:12.0pt'><span =
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le class=3DMsoNormalTable border=3D0 cellspacing=3D0 cellpadding=3D0 =
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3.75pt 0cm'><p class=3DMsoNormal style=3D'line-height:9.75pt'><span =
style=3D'font-size:7.0pt;font-family:"Verdana",sans-serif;color:#58595B'>=
Barcelona | Barneveld | Beijing | Chengdu | Guangzhou<br>Hamburg | =
Shanghai | Shenzhen | Stockholm<o:p></o:p></span></p></td><td width=3D5 =
valign=3Dtop style=3D'width:3.75pt;padding:0cm 0cm 0cm 0cm'><p =
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3.75pt 0cm'><p class=3DMsoNormal style=3D'line-height:9.75pt'><span =
style=3D'font-size:7.0pt;font-family:"Verdana",sans-serif;color:#58595B'>=
<a =
href=3D"https://webpower.nl/event/kennissessies/?utm_source=3DGML&amp;utm=
_medium=3DEMAIL&amp;utm_campaign=3DEVENT&amp;utm_term=3DKNOWLDGS&amp;utm_=
content=3DNL" target=3D"_blank" title=3D"Webpower Food for =
Thought-kennissessies"><span =
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</a><o:p></o:p></span></p></td></tr></table></div></div></div></div></div=
></div></div></div></div></div></div></div></div></div></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p class=3DMsoNormal>Op =
ma 17 dec. 2018 om 19:54 schreef H=C3=A5kon Alstadheim &lt;<a =
href=3D"mailto:hakon@alstadheim.priv.no">hakon@alstadheim.priv.no</a>&gt;=
:<o:p></o:p></p></div><blockquote style=3D'border:none;border-left:solid =
#CCCCCC 1.0pt;padding:0cm 0cm 0cm =
6.0pt;margin-left:4.8pt;margin-right:0cm'><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><br>Den 17.12.2018 10:32, skrev Roalt =
Zijlstra | webpower:<br>&gt; Hey H=C3=A5kon,<br>&gt;<br>&gt; One little =
tip on disk IO in Virtual hosts, is changing the FS <br>&gt; scheduler =
from cfq to noop. In our Xen PV configs we add this to the <br>&gt; =
xen.cfg files at the end:<br>&gt;<br>&gt; =
extra=3D&quot;clocksource=3Dtsc elevator=3Dnoop&quot;<br>&gt;<br>&gt; =
Especially the &quot;elevator=3Dnoop&quot; parameter is forcing all =
FS-es to the <br>&gt; noop scheduler. In my experience that gave our =
Xenservers a pretty <br>&gt; nice boost.<br>&gt; Red Hat does recoomend =
this for all Virtual servers (see the link <br>&gt; below). To test this =
you don't need to reboot at all.<br>&gt;<br>&gt; For example from the =
link below there is a code snippet about getting <br>&gt; and setting =
the scheduler for /dev/hda. (Replace hda with sdb or any <br>&gt; other =
block device)<br>&gt;<br>&gt; # cat =
/sys/block/hda/queue/scheduler<br>&gt; noop anticipatory deadline =
[cfq]<br>&gt;<br>&gt; # echo 'noop' &gt; =
/sys/block/hda/queue/scheduler<br>&gt; # cat =
/sys/block/hda/queue/scheduler<br>&gt; [noop] anticipatory deadline =
cfq<br>&gt;<br>&gt; More info: <a =
href=3D"https://access.redhat.com/solutions/5427" =
target=3D"_blank">https://access.redhat.com/solutions/5427</a><br><br>Yes=
, found that resource some time ago. Tried again now, no =
<br>break-through. I've got 'none' available as scheduler, rather than =
noop, <br>but they should be equal. No matter what I do (in dom0 and/or =
domu) I <br>get at least 10 x higher speed in the dom0. :-/ =
.<br><br>Example:<br><br>###<br><br>###In dom0, md-raid on drives f j g =
h i k. echo-and-cat does the obvious.<br><br>### (I usually run with =
mq-deadline as scheduler. seems to give <br>marginally better =
performance)<br><br># for f in f j g h i k ; do echo-and-cat =
<br>/sys/block/sd${f}/queue/scheduler;done<br>/sys/block/sdf/queue/schedu=
ler<br>[none] mq-deadline kyber =
bfq<br>/sys/block/sdj/queue/scheduler<br>[none] mq-deadline kyber =
bfq<br>/sys/block/sdg/queue/scheduler<br>[none] mq-deadline kyber =
bfq<br>/sys/block/sdh/queue/scheduler<br>[none] mq-deadline kyber =
bfq<br>/sys/block/sdi/queue/scheduler<br>[none] mq-deadline kyber =
bfq<br>/sys/block/sdk/queue/scheduler<br>[none] mq-deadline kyber =
bfq<br># mount /dev/disk/by-label/SAS-STEAM /mnt/tull<br># cd =
/mnt/tull/tmp<br># df -hT ./<br>Filesystem&nbsp;&nbsp;&nbsp;&nbsp; =
Type&nbsp; Size&nbsp; Used Avail Use% Mounted =
on<br>/dev/md2p8&nbsp;&nbsp;&nbsp;&nbsp; ext4&nbsp; 196G&nbsp; =
164G&nbsp;&nbsp; 23G&nbsp; 88% /mnt/tull<br># dd if=3D/dev/zero =
of=3Da_file bs=3D1M count=3D1024 conv=3Dfsync oflag=3Ddirect<br>1024+0 =
records in<br>1024+0 records out<br>1073741824 bytes (1.1 GB, 1.0 GiB) =
copied, 4.56845 s, 235 MB/s<br>0:root@gentoo tmp # dd if=3D/dev/zero =
of=3Da_file bs=3D1M count=3D1024 <br>conv=3Dfsync =
oflag=3Ddirect<br>1024+0 records in<br>1024+0 records out<br>1073741824 =
bytes (1.1 GB, 1.0 GiB) copied, 7.52557 s, 143 MB/s<br>###<br><br>### =
Booting domu with root and /tmp on SAS-STEAM, ssh into =
domu<br><br>###<br><br># cd /tmp<br># df -hT =
./<br>Filsystem&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Type St=C3=B8rrelse Brukt =
Tilgj. Bruk% Montert p=C3=A5<br>/dev/xvdb&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
ext4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 196G&nbsp; 163G&nbsp;&nbsp;&nbsp; =
24G&nbsp;&nbsp; 88% /<br># cat =
/sys/block/xvdb/<br>alignment_offset&nbsp;&nbsp; =
device/&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 holders/ =
power/&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp; =
<br>ro&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
subsystem/<br>bdi/&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp; discard_alignment&nbsp; inflight =
queue/&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp; =
<br>size&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp; =
trace/<br>capability&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
ext_range&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
integrity/ =
range&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; =
<br>slaves/&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp; =
uevent<br>dev&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
hidden&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp; mq/ =
removable&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
stat<br># cat /sys/block/xvdb/queue/scheduler<br>[none] mq-deadline<br># =
cd /tmp<br># df -hT ./<br>Filsystem&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Type =
St=C3=B8rrelse Brukt Tilgj. Bruk% Montert =
p=C3=A5<br>/dev/xvdb&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
ext4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 196G&nbsp; 163G&nbsp;&nbsp;&nbsp; =
24G&nbsp;&nbsp; 88% /<br># cat =
/sys/block/xvdb/<br>alignment_offset&nbsp;&nbsp; =
device/&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 holders/ =
power/&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp; =
<br>ro&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
subsystem/<br>bdi/&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp; discard_alignment&nbsp; inflight =
queue/&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp; =
<br>size&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp; =
trace/<br>capability&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
ext_range&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
integrity/ =
range&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; =
<br>slaves/&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp; =
uevent<br>dev&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
hidden&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp; mq/ =
removable&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
stat<br># cat /sys/block/xvdb/queue/scheduler<br>[none] mq-deadline<br># =
dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 conv=3Dfsync =
oflag=3Ddirect<br>1024+0 oppf=C3=B8ringer inn<br>1024+0 oppf=C3=B8ringer =
ut<br>1073741824 byte (1,1 GB, 1,0 GiB) kopiert, 64,2402 s, 16,7 =
MB/s<br># dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 =
conv=3Dfsync oflag=3Ddirect<br>1024+0 oppf=C3=B8ringer inn<br>1024+0 =
oppf=C3=B8ringer ut<br>1073741824 byte (1,1 GB, 1,0 GiB) kopiert, =
59,7517 s, 18,0 =
MB/s<br>#<br><br><br><br><o:p></o:p></p></blockquote></div></div></body><=
/html>
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From: Vikram K <vikram.k@pathpartnertech.com>
Date: Wed, 19 Dec 2018 11:15:50 +0530
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To: Oleksandr Andrushchenko <andr2000@gmail.com>
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Subject: Re: [Xen-users] [Xen-devel] [XEN][ARM64] PV DRM failing to convert
 virtual to physical address
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Hello Oleksandr,

Please find the attached log file.

Could please provide some pointers on how test DomU display.

On Tue, Dec 18, 2018 at 12:06 PM Oleksandr Andrushchenko <andr2000@gmail.com>
wrote:
Hello, Vikram!
>   * We are using 64 bit arm platform.
>   * Linux 4.20 Kernel in DomU with PV DRM front-end drivers.
>
>> Do you have [1] enabled in your DomD kernel?
     Earlier this configuration was not enabled. Enabled it now.

>
>   * Xen-4.12 unstable version.
>
>> We never tested PV DRM with 4.12 so far, did you try with 4.10 for
example?
     Xen-4.8 is working on our platform. Xen-4.9 to Xen-4.11 version fails
while initializing CPU on our platform. Recently
     we received patch from Julien for Xen-4.12 unstable version, which has
fix. Tried to apply patch on Xen-4.10 stable facing build issue.

      This is where we are at the moment and have all PV drivers running
smoothly

>   * Able to build displ_be application and also its dependencies.
>
> Added below configuration in Domain-U config file.*|
> |*
> *|vdispl = [
'backend=Domain-0,be-alloc=0,connectors=HDMI-A-1:1920x1080']|*
>
>> Do you really have DomD as your configuration says?
     Sorry it not DomD it is Domain-0.

>> Not Dom0 running the backend?
     Domain-0 is running in Dom0 and debian is running as DomU.

> Before launching the DomU ran the displ_be application in the
> background.
>  $ displ_be -m DRM -v *:Debug &
Please add display back-end logs

>
> Started Domain-U.
> $ xl create -c debian.cfg
>
>> Could you please build the PV DRM driver as module,
>> Built as module.

then run the following commands:

echo 0xff > /sys/module/drm/parameters/debug
echo 8 > /proc/sys/kernel/printk

>> and get back with DRM logs in DomU?
Please find the attached log file
-- 
Thanks & Regards
Vikram KS

-- 






This
message contains confidential information and is intended only 
for the
individual(s) named. If you are not the intended
recipient, you are 
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action in 
reliance on the contents of this mail and attached file/s is strictly

prohibited. Please notify the
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--0000000000007d644d057d598739
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div><div dir=3D"ltr"><div>Hello Oleksandr,</div><div><br>=
</div><div>Please find the attached log file.</div><div><br></div><div>Coul=
d please provide some pointers on how test DomU display.</div><div><br></di=
v><div dir=3D"ltr">On Tue, Dec 18, 2018 at 12:06 PM Oleksandr Andrushchenko=
 &lt;<a href=3D"mailto:andr2000@gmail.com" target=3D"_blank">andr2000@gmail=
.com</a>&gt; wrote:<br></div><div dir=3D"ltr">Hello, Vikram!</div></div>&gt=
;=C2=A0 =C2=A0* We are using 64 bit arm platform.<br>
&gt;=C2=A0 =C2=A0* Linux 4.20 Kernel in DomU with PV DRM front-end drivers.=
<br>
&gt;<br><div>
&gt;&gt; Do you have [1] enabled in your DomD kernel?</div><div>=C2=A0=C2=
=A0=C2=A0=C2=A0 Earlier this configuration was not enabled. Enabled it now.=
</div><div><br></div>
&gt;<br>
&gt;=C2=A0 =C2=A0* Xen-4.12 unstable version.<br>
&gt;<br>
&gt;&gt; We never tested PV DRM with 4.12 so far, did you try with 4.10 for=
 example?<br></div><div>=C2=A0=C2=A0=C2=A0=C2=A0 Xen-4.8 is working on our =
platform. Xen-4.9 to Xen-4.11 version fails while initializing CPU on our p=
latform. Recently</div><div>=C2=A0=C2=A0=C2=A0=C2=A0 we received patch from=
 Julien for Xen-4.12 unstable version, which has fix. Tried to apply patch =
on Xen-4.10 stable facing build issue.<br></div><div><br></div><div>=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 This is where we are at the moment and have all PV=
 drivers running smoothly<br>
<br>
&gt;=C2=A0 =C2=A0* Able to build displ_be application and also its dependen=
cies.<br>
&gt;<br>
&gt; Added below configuration in Domain-U config file.*|<br>
&gt; |*<br>
&gt; *|vdispl =3D [ &#39;backend=3DDomain-0,be-alloc=3D0,connectors=3DHDMI-=
A-1:1920x1080&#39;]|*<br>
&gt;<br>
&gt;&gt; Do you really have DomD as your configuration says?<br>=C2=A0=C2=
=A0=C2=A0=C2=A0
Sorry it not DomD it is Domain-0.=C2=A0</div><div><br>
&gt;&gt; Not Dom0 running the backend?<br>=C2=A0=C2=A0=C2=A0=C2=A0 Domain-0=
 is running in Dom0 and debian is running as DomU.</div><div><br></div><div=
>
&gt; Before launching the DomU ran the displ_be application in the <br>
&gt; background.<br>
&gt; =C2=A0$ displ_be -m DRM -v *:Debug &amp;<br>
Please add display back-end logs</div><div><br>
&gt;<br>
&gt; Started Domain-U.<br>
&gt; $ xl create -c debian.cfg<br>
&gt;<br>
&gt;&gt; Could you please build the PV DRM driver as module,</div><div>&gt;=
&gt; Built as module.</div><div><br></div><div>
then run the following commands:<br>
<br>
echo 0xff &gt; /sys/module/drm/parameters/debug<br>
echo 8 &gt; /proc/sys/kernel/printk<br>
<br>
&gt;&gt; and get back with DRM logs in DomU?<br></div><div>Please find the =
attached log file<br></div><div>-- <br><div dir=3D"ltr" class=3D"m_87294904=
15642103177gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><span>Th=
anks &amp; Regards<br>Vikram KS<br></span><span style=3D"color:rgb(19,79,92=
)"></span></div></div></div></div></div></div>

<br>




<p><span lang=3D"EN-IN">This
message contains confidential information and is intended only for the
individual(s) named.</span><span lang=3D"EN-IN"> </span>If you are not the =
intended
recipient, you are notified that disclosing, copying, distributing or takin=
g any
action in reliance on the contents of this mail and attached file/s is stri=
ctly
prohibited<span lang=3D"EN-IN">. Please notify the
sender immediately and delete this e-mail from your system. E-mail transmis=
sion
cannot be guaranteed to be secured or error-free as information could be
intercepted, corrupted, lost, destroyed, arrive late or incomplete, or cont=
ain
viruses. The sender therefore does not accept liability for any errors or
omissions in the contents of this message, which arise as a result of e-mai=
l
transmission.</span></p>
--0000000000007d644d057d598739--

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From: "Roalt Zijlstra | webpower" <roalt.zijlstra@webpower.nl>
Date: Wed, 19 Dec 2018 09:43:55 +0100
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To: Jaap Gordijn <jaap@gordijn.org>
Subject: Re: [Xen-users] Disk performance on guest incredibly low.
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Hi Jaap,

We mostly use the stock 4.9 kernels for Stretch. We currently do have two
new Dell PE R740 servers which require at least 4.11 kernel and they now
run on a 4.16 kernel of backports.
But I think you need to disable the Multi queue block mode at boot time of
Dom0  and DomU using the kernel boot setting:
scsi_mod.use_blk_mq=3D0

I am not sure (have not tested anything about that) if multi-queue block
mode propagates from Dom0 to DomU automatically.

Best regards,

  Roalt Zijlstra
    Teamleader Infra & Deliverability

  roalt.zijlstra@webpower.nl
  +31 342 423 262
  roalt.zijlstra
  https://www.webpower-group.com

<https://www.webpower-group.com/>

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Op di 18 dec. 2018 om 16:43 schreef Jaap Gordijn <jaap@gordijn.org>:

> Hi,
>
>
>
> I just run newer kernels because I hoped it would improve the IO
> performance, which apparently is not the case.
>
> Which kernel versions are you running? Then I can try those, to see if
> that solves the problem.
>
>
>
> Best,
>
>
>
> -- Jaap
>
>
>
> *Van:* Xen-users <xen-users-bounces@lists.xenproject.org> *Namens *Roalt
> Zijlstra | webpower
> *Verzonden:* Tuesday, 18 December 2018 16:12
> *Aan:* H=C3=A5kon Alstadheim <hakon@alstadheim.priv.no>
> *CC:* xen-users@lists.xenproject.org
> *Onderwerp:* Re: [Xen-users] Disk performance on guest incredibly low.
>
>
>
> Hi,
>
>
>
> You are definitely running newer kernels then I do.. But I tested that
> with a setting in the grub.cfg I can enable the multi-queue block mode by
> adding 'scsi_mod.use_blk_mq=3D1'.
>
> I would think that if you use 'scsi_mod.use_blk_mq=3D0' you can disable t=
he
> multi-queue block mode.
>
> In general the multi-queue block modes should be better, but it is worth =
a
> try in combination with Xen to test the single queue block mode.
>
>
>
> Best regards,
>
>
>
>
>
>
>
> *Roalt Zijlstra*
>
>
>
>
>
> *Teamleader Infra & Deliverability*
>
>
>
>
>
>
>
>
>
> roalt.zijlstra@webpower.nl
>
>
>
> +31 342 423 262
>
>
>
> roalt.zijlstra
>
>
>
> https://www.webpower-group.com
>
>
>
>
>
> <https://www.webpower-group.com/>
>
>
>
> [image: Facebook] <https://www.facebook.com/webpower.marketingautomation/=
>
>
>
>
> [image: Twitter] <https://twitter.com/webpower>
>
>
>
> [image: Linkedin] <https://www.linkedin.com/company/36782/>
>
>
>
> Barcelona | Barneveld | Beijing | Chengdu | Guangzhou
> Hamburg | Shanghai | Shenzhen | Stockholm
>
>
>
>
>
>
> <https://webpower.nl/event/kennissessies/?utm_source=3DGML&utm_medium=3DE=
MAIL&utm_campaign=3DEVENT&utm_term=3DKNOWLDGS&utm_content=3DNL>
>
>
>
>
>
> Op ma 17 dec. 2018 om 19:54 schreef H=C3=A5kon Alstadheim <
> hakon@alstadheim.priv.no>:
>
>
> Den 17.12.2018 10:32, skrev Roalt Zijlstra | webpower:
> > Hey H=C3=A5kon,
> >
> > One little tip on disk IO in Virtual hosts, is changing the FS
> > scheduler from cfq to noop. In our Xen PV configs we add this to the
> > xen.cfg files at the end:
> >
> > extra=3D"clocksource=3Dtsc elevator=3Dnoop"
> >
> > Especially the "elevator=3Dnoop" parameter is forcing all FS-es to the
> > noop scheduler. In my experience that gave our Xenservers a pretty
> > nice boost.
> > Red Hat does recoomend this for all Virtual servers (see the link
> > below). To test this you don't need to reboot at all.
> >
> > For example from the link below there is a code snippet about getting
> > and setting the scheduler for /dev/hda. (Replace hda with sdb or any
> > other block device)
> >
> > # cat /sys/block/hda/queue/scheduler
> > noop anticipatory deadline [cfq]
> >
> > # echo 'noop' > /sys/block/hda/queue/scheduler
> > # cat /sys/block/hda/queue/scheduler
> > [noop] anticipatory deadline cfq
> >
> > More info: https://access.redhat.com/solutions/5427
>
> Yes, found that resource some time ago. Tried again now, no
> break-through. I've got 'none' available as scheduler, rather than noop,
> but they should be equal. No matter what I do (in dom0 and/or domu) I
> get at least 10 x higher speed in the dom0. :-/ .
>
> Example:
>
> ###
>
> ###In dom0, md-raid on drives f j g h i k. echo-and-cat does the obvious.
>
> ### (I usually run with mq-deadline as scheduler. seems to give
> marginally better performance)
>
> # for f in f j g h i k ; do echo-and-cat
> /sys/block/sd${f}/queue/scheduler;done
> /sys/block/sdf/queue/scheduler
> [none] mq-deadline kyber bfq
> /sys/block/sdj/queue/scheduler
> [none] mq-deadline kyber bfq
> /sys/block/sdg/queue/scheduler
> [none] mq-deadline kyber bfq
> /sys/block/sdh/queue/scheduler
> [none] mq-deadline kyber bfq
> /sys/block/sdi/queue/scheduler
> [none] mq-deadline kyber bfq
> /sys/block/sdk/queue/scheduler
> [none] mq-deadline kyber bfq
> # mount /dev/disk/by-label/SAS-STEAM /mnt/tull
> # cd /mnt/tull/tmp
> # df -hT ./
> Filesystem     Type  Size  Used Avail Use% Mounted on
> /dev/md2p8     ext4  196G  164G   23G  88% /mnt/tull
> # dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 conv=3Dfsync oflag=
=3Ddirect
> 1024+0 records in
> 1024+0 records out
> 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 4.56845 s, 235 MB/s
> 0:root@gentoo tmp # dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024
> conv=3Dfsync oflag=3Ddirect
> 1024+0 records in
> 1024+0 records out
> 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 7.52557 s, 143 MB/s
> ###
>
> ### Booting domu with root and /tmp on SAS-STEAM, ssh into domu
>
> ###
>
> # cd /tmp
> # df -hT ./
> Filsystem      Type St=C3=B8rrelse Brukt Tilgj. Bruk% Montert p=C3=A5
> /dev/xvdb      ext4      196G  163G    24G   88% /
> # cat /sys/block/xvdb/
> alignment_offset   device/            holders/ power/
> ro                 subsystem/
> bdi/               discard_alignment  inflight queue/
> size               trace/
> capability         ext_range          integrity/ range
> slaves/            uevent
> dev                hidden             mq/ removable          stat
> # cat /sys/block/xvdb/queue/scheduler
> [none] mq-deadline
> # cd /tmp
> # df -hT ./
> Filsystem      Type St=C3=B8rrelse Brukt Tilgj. Bruk% Montert p=C3=A5
> /dev/xvdb      ext4      196G  163G    24G   88% /
> # cat /sys/block/xvdb/
> alignment_offset   device/            holders/ power/
> ro                 subsystem/
> bdi/               discard_alignment  inflight queue/
> size               trace/
> capability         ext_range          integrity/ range
> slaves/            uevent
> dev                hidden             mq/ removable          stat
> # cat /sys/block/xvdb/queue/scheduler
> [none] mq-deadline
> # dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 conv=3Dfsync oflag=
=3Ddirect
> 1024+0 oppf=C3=B8ringer inn
> 1024+0 oppf=C3=B8ringer ut
> 1073741824 byte (1,1 GB, 1,0 GiB) kopiert, 64,2402 s, 16,7 MB/s
> # dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 conv=3Dfsync oflag=
=3Ddirect
> 1024+0 oppf=C3=B8ringer inn
> 1024+0 oppf=C3=B8ringer ut
> 1073741824 byte (1,1 GB, 1,0 GiB) kopiert, 59,7517 s, 18,0 MB/s
> #
>
>
>
>

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif;font-size:small">Hi Jaap,</div><div class=3D"gmail_defau=
lt" style=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br></=
div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-=
serif;font-size:small">We mostly use the stock 4.9 kernels for Stretch. We =
currently do have two new Dell PE R740 servers which require at least 4.11 =
kernel and they now run on a 4.16 kernel of backports.</div><div class=3D"g=
mail_default" style=3D"font-family:arial,helvetica,sans-serif;font-size:sma=
ll">But I think you need to disable the Multi queue block mode at boot time=
 of Dom0=C2=A0 and DomU using the kernel boot setting:</div><div class=3D"g=
mail_default" style=3D"font-family:arial,helvetica,sans-serif;font-size:sma=
ll"><span style=3D"font-family:Arial,Helvetica,sans-serif">scsi_mod.use_blk=
_mq=3D0</span></div><div class=3D"gmail_default" style=3D"font-family:arial=
,helvetica,sans-serif;font-size:small"><span style=3D"font-family:Arial,Hel=
vetica,sans-serif"><br></span></div><div class=3D"gmail_default" style=3D"f=
ont-family:arial,helvetica,sans-serif;font-size:small"><span style=3D"font-=
family:Arial,Helvetica,sans-serif">I am not sure (have not tested anything =
about that) if multi-queue block mode propagates from Dom0 to DomU automati=
cally.</span></div><div class=3D"gmail_default" style=3D"font-family:arial,=
helvetica,sans-serif;font-size:small">=C2=A0<br></div><div><div dir=3D"ltr"=
 class=3D"gmail_signature" data-smartmail=3D"gmail_signature"><div dir=3D"l=
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ont-size:12.8px;color:rgb(34,34,34);font-family:arial,sans-serif"><table wi=
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9,91);font-size:13px;line-height:16px"><font face=3D"verdana, sans-serif">B=
est regards,</font></td></tr><tr><td valign=3D"top" align=3D"left" width=3D=
"20"><font face=3D"verdana, sans-serif">=C2=A0</font></td></tr></tbody></ta=
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44,138);font-size:18px;font-weight:bold;line-height:16px"><font face=3D"ver=
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middle" align=3D"left" style=3D"color:rgb(88,89,91);font-size:13px;line-hei=
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ns-serif">roalt.zijlstra@webpower.nl</font></a></td></tr><tr><td valign=3D"=
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dy></table><table width=3D"320" cellpadding=3D"0" cellspacing=3D"0" style=
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=3D"left" width=3D"5"></td><td valign=3D"top" align=3D"left" style=3D"paddi=
ng-top:5px;padding-bottom:5px;font-family:Verdana,sans-serif,&quot;Lucida G=
rande&quot;;border-top:1px solid rgb(221,221,221);font-size:9px;line-height=
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arneveld | Beijing | Chengdu | Guangzhou<br>Hamburg | Shanghai | Shenzhen |=
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r></tbody></table><table width=3D"320" cellpadding=3D"0" cellspacing=3D"0" =
style=3D"color:rgb(0,0,0);font-family:&quot;Times New Roman&quot;;font-size=
:medium"><tbody><tr><td valign=3D"top" align=3D"left" width=3D"5"></td><td =
valign=3D"top" align=3D"left" style=3D"padding-top:5px;padding-bottom:5px;f=
ont-family:Verdana,sans-serif,&quot;Lucida Grande&quot;;border-top:1px soli=
d rgb(221,221,221);font-size:9px;line-height:13px;color:rgb(88,89,91)"><a h=
ref=3D"https://webpower.nl/event/kennissessies/?utm_source=3DGML&amp;utm_me=
dium=3DEMAIL&amp;utm_campaign=3DEVENT&amp;utm_term=3DKNOWLDGS&amp;utm_conte=
nt=3DNL" title=3D"Webpower Food for Thought-kennissessies" style=3D"font-fa=
mily:&quot;Times New Roman&quot;;font-size:medium" target=3D"_blank"><img s=
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0" style=3D"display:block"></a></td></tr></tbody></table></div></div></div>=
</div></div></div></div></div></div></div></div></div></div></div></div></d=
iv><br></div><br><div class=3D"gmail_quote"><div dir=3D"ltr">Op di 18 dec. =
2018 om 16:43 schreef Jaap Gordijn &lt;<a href=3D"mailto:jaap@gordijn.org">=
jaap@gordijn.org</a>&gt;:<br></div><blockquote class=3D"gmail_quote" style=
=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding=
-left:1ex"><div lang=3D"en-NL"><div class=3D"gmail-m_-8601659734818629330Wo=
rdSection1"><p class=3D"MsoNormal"><span lang=3D"EN-US">Hi,<u></u><u></u></=
span></p><p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></=
span></p><p class=3D"MsoNormal"><span lang=3D"EN-US">I just run newer kerne=
ls because I hoped it would improve the IO performance, which apparently is=
 not the case.<u></u><u></u></span></p><p class=3D"MsoNormal"><span lang=3D=
"EN-US">Which kernel versions are you running? Then I can try those, to see=
 if that solves the problem.<u></u><u></u></span></p><p class=3D"MsoNormal"=
><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p><p class=3D"MsoNormal"=
><span lang=3D"EN-US">Best,<u></u><u></u></span></p><p class=3D"MsoNormal">=
<span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p><p class=3D"MsoNormal">=
<span lang=3D"EN-US">-- Jaap<u></u><u></u></span></p><p class=3D"MsoNormal"=
><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p><p class=3D"MsoNormal"=
><b><span lang=3D"NL">Van:</span></b><span lang=3D"NL"> Xen-users &lt;<a hr=
ef=3D"mailto:xen-users-bounces@lists.xenproject.org" target=3D"_blank">xen-=
users-bounces@lists.xenproject.org</a>&gt; <b>Namens </b>Roalt Zijlstra | w=
ebpower<br><b>Verzonden:</b> Tuesday, 18 December 2018 16:12<br><b>Aan:</b>=
 H=C3=A5kon Alstadheim &lt;<a href=3D"mailto:hakon@alstadheim.priv.no" targ=
et=3D"_blank">hakon@alstadheim.priv.no</a>&gt;<br><b>CC:</b> <a href=3D"mai=
lto:xen-users@lists.xenproject.org" target=3D"_blank">xen-users@lists.xenpr=
oject.org</a><br><b>Onderwerp:</b> Re: [Xen-users] Disk performance on gues=
t incredibly low.<u></u><u></u></span></p><p class=3D"MsoNormal"><u></u>=C2=
=A0<u></u></p><div><div><p class=3D"MsoNormal"><span style=3D"font-size:12p=
t;font-family:Arial,sans-serif">Hi,<u></u><u></u></span></p></div><div><p c=
lass=3D"MsoNormal"><span style=3D"font-size:12pt;font-family:Arial,sans-ser=
if"><u></u>=C2=A0<u></u></span></p></div><div><p class=3D"MsoNormal"><span =
style=3D"font-family:Arial,sans-serif">You are definitely running newer ker=
nels then I do.. But I tested that with a setting in the grub.cfg I can ena=
ble the multi-queue block mode by adding</span>=C2=A0&#39;scsi_mod.use_blk_=
mq=3D1&#39;.<u></u><u></u></p></div><div><p class=3D"MsoNormal">I would thi=
nk that if you use &#39;scsi_mod.use_blk_mq=3D0&#39; you can disable the mu=
lti-queue block mode.<u></u><u></u></p></div><div><p class=3D"MsoNormal">In=
 general the multi-queue block modes should be better, but it is worth a tr=
y in combination with Xen to test the single queue block mode.<u></u><u></u=
></p></div><div><p class=3D"MsoNormal"><span style=3D"font-size:12pt;font-f=
amily:Arial,sans-serif"><u></u>=C2=A0<u></u></span></p></div><div><div><div=
><div><div><div><div><div><div><div><div><div><div><div><div><div><table cl=
ass=3D"gmail-m_-8601659734818629330MsoNormalTable" border=3D"0" cellspacing=
=3D"0" cellpadding=3D"0" width=3D"100%" style=3D"width:100%"><tbody><tr><td=
 valign=3D"top" style=3D"padding:0cm"><table class=3D"gmail-m_-860165973481=
8629330MsoNormalTable" border=3D"0" cellspacing=3D"0" cellpadding=3D"0" wid=
th=3D"100%" style=3D"width:100%"><tbody><tr><td valign=3D"top" style=3D"pad=
ding:0cm"><p class=3D"MsoNormal" style=3D"line-height:12pt"><span style=3D"=
font-size:10pt;font-family:Verdana,sans-serif;color:rgb(88,89,91)">Best reg=
ards,</span><span style=3D"font-size:10pt;font-family:&quot;Times New Roman=
&quot;,serif;color:rgb(88,89,91)"><u></u><u></u></span></p></td></tr><tr><t=
d width=3D"20" valign=3D"top" style=3D"width:15pt;padding:0cm"><p class=3D"=
MsoNormal"><span style=3D"font-size:13.5pt;font-family:Verdana,sans-serif;c=
olor:black">=C2=A0</span><span style=3D"font-size:13.5pt;font-family:&quot;=
Times New Roman&quot;,serif;color:black"><u></u><u></u></span></p></td></tr=
></tbody></table><p class=3D"MsoNormal" style=3D"line-height:12pt"><span st=
yle=3D"font-size:10pt;font-family:&quot;Times New Roman&quot;,serif;color:r=
gb(88,89,91);display:none"><u></u>=C2=A0<u></u></span></p><table class=3D"g=
mail-m_-8601659734818629330MsoNormalTable" border=3D"0" cellspacing=3D"0" c=
ellpadding=3D"0" width=3D"320" style=3D"width:240pt"><tbody><tr><td width=
=3D"20" valign=3D"top" style=3D"width:15pt;padding:0cm"><p class=3D"MsoNorm=
al"><span style=3D"font-size:13.5pt;color:black"><img width=3D"20" style=3D=
"width: 0.2083in;" id=3D"gmail-m_-8601659734818629330_x0000_i1025" src=3D"h=
ttps://www.webpower.nl/signature/images/icon_user.jpg"><u></u><u></u></span=
></p></td><td width=3D"20" valign=3D"top" style=3D"width:15pt;padding:0cm">=
<p class=3D"MsoNormal"><span style=3D"font-size:13.5pt;font-family:Verdana,=
sans-serif;color:black">=C2=A0</span><span style=3D"font-size:13.5pt;color:=
black"><u></u><u></u></span></p></td><td style=3D"padding:0cm"><p class=3D"=
MsoNormal"><b><span style=3D"font-size:13.5pt;font-family:Verdana,sans-seri=
f;color:rgb(102,44,138)">Roalt Zijlstra</span></b><b><span style=3D"font-si=
ze:13.5pt;color:rgb(102,44,138)"><u></u><u></u></span></b></p></td></tr><tr=
><td width=3D"20" valign=3D"top" style=3D"width:15pt;padding:0cm"><p class=
=3D"MsoNormal"><span style=3D"font-size:13.5pt;font-family:Verdana,sans-ser=
if;color:black">=C2=A0</span><span style=3D"font-size:13.5pt;color:black"><=
u></u><u></u></span></p></td><td width=3D"20" valign=3D"top" style=3D"width=
:15pt;padding:0cm"><p class=3D"MsoNormal"><span style=3D"font-size:13.5pt;f=
ont-family:Verdana,sans-serif;color:black">=C2=A0</span><span style=3D"font=
-size:13.5pt;color:black"><u></u><u></u></span></p></td><td style=3D"paddin=
g:0cm"><p class=3D"MsoNormal" style=3D"line-height:12pt"><i><span style=3D"=
font-size:10pt;font-family:Verdana,sans-serif;color:rgb(88,89,91)">Teamlead=
er Infra &amp; Deliverability</span></i><i><span style=3D"font-size:10pt;co=
lor:rgb(88,89,91)"><u></u><u></u></span></i></p></td></tr><tr><td width=3D"=
20" valign=3D"top" style=3D"width:15pt;padding:0cm"><p class=3D"MsoNormal">=
<span style=3D"font-size:13.5pt;font-family:Verdana,sans-serif;color:black"=
>=C2=A0</span><span style=3D"font-size:13.5pt;color:black"><u></u><u></u></=
span></p></td><td width=3D"20" valign=3D"top" style=3D"width:15pt;padding:0=
cm"><p class=3D"MsoNormal"><span style=3D"font-size:13.5pt;font-family:Verd=
ana,sans-serif;color:black">=C2=A0</span><span style=3D"font-size:13.5pt;co=
lor:black"><u></u><u></u></span></p></td><td valign=3D"top" style=3D"paddin=
g:0cm"><p class=3D"MsoNormal" style=3D"line-height:12pt"><span style=3D"fon=
t-size:10pt;font-family:Verdana,sans-serif;color:rgb(88,89,91)">=C2=A0</spa=
n><span style=3D"font-size:10pt;color:rgb(88,89,91)"><u></u><u></u></span><=
/p></td></tr><tr><td width=3D"20" valign=3D"top" style=3D"width:15pt;paddin=
g:0cm"><p class=3D"MsoNormal"><span style=3D"font-size:13.5pt;color:black">=
<img width=3D"20" style=3D"width: 0.2083in;" id=3D"gmail-m_-860165973481862=
9330_x0000_i1026" src=3D"https://www.webpower.nl/signature/images/icon_emai=
l.jpg"><u></u><u></u></span></p></td><td width=3D"20" valign=3D"top" style=
=3D"width:15pt;padding:0cm"><p class=3D"MsoNormal"><span style=3D"font-size=
:13.5pt;font-family:Verdana,sans-serif;color:black">=C2=A0</span><span styl=
e=3D"font-size:13.5pt;color:black"><u></u><u></u></span></p></td><td style=
=3D"padding:0cm"><p class=3D"MsoNormal" style=3D"line-height:12pt"><span st=
yle=3D"font-size:10pt;color:rgb(88,89,91)"><a href=3D"mailto:roalt.zijlstra=
@webpower.nl" title=3D"webpower" target=3D"_blank"><span style=3D"font-fami=
ly:Verdana,sans-serif;color:rgb(245,126,55)">roalt.zijlstra@webpower.nl</sp=
an></a><u></u><u></u></span></p></td></tr><tr><td width=3D"20" valign=3D"to=
p" style=3D"width:15pt;padding:0cm"><p class=3D"MsoNormal"><span style=3D"f=
ont-size:13.5pt;color:black"><img border=3D"0" width=3D"20" style=3D"width:=
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/td><td width=3D"20" valign=3D"top" style=3D"width:15pt;padding:0cm"><p cla=
ss=3D"MsoNormal"><span style=3D"font-size:13.5pt;font-family:Verdana,sans-s=
erif;color:black">=C2=A0</span><span style=3D"font-size:13.5pt;color:black"=
><u></u><u></u></span></p></td><td style=3D"padding:0cm"><p class=3D"MsoNor=
mal" style=3D"line-height:12pt"><span style=3D"font-size:10pt;font-family:V=
erdana,sans-serif;color:rgb(88,89,91)">+31 342 423 262</span><span style=3D=
"font-size:10pt;color:rgb(88,89,91)"><u></u><u></u></span></p></td></tr><tr=
><td width=3D"20" valign=3D"top" style=3D"width:15pt;padding:0cm"><p class=
=3D"MsoNormal"><span style=3D"font-size:13.5pt;color:black"><img border=3D"=
0" width=3D"20" style=3D"width: 0.2083in;" id=3D"gmail-m_-86016597348186293=
30_x0000_i1028" src=3D"https://www.webpower.nl/signature/images/icon_skype.=
jpg"><u></u><u></u></span></p></td><td width=3D"20" valign=3D"top" style=3D=
"width:15pt;padding:0cm"><p class=3D"MsoNormal"><span style=3D"font-size:13=
.5pt;font-family:Verdana,sans-serif;color:black">=C2=A0</span><span style=
=3D"font-size:13.5pt;color:black"><u></u><u></u></span></p></td><td style=
=3D"padding:0cm"><p class=3D"MsoNormal" style=3D"line-height:12pt"><span st=
yle=3D"font-size:10pt;font-family:Verdana,sans-serif;color:rgb(88,89,91)">r=
oalt.zijlstra</span><span style=3D"font-size:10pt;color:rgb(88,89,91)"><u><=
/u><u></u></span></p></td></tr><tr><td width=3D"20" valign=3D"top" style=3D=
"width:15pt;padding:0cm"><p class=3D"MsoNormal"><span style=3D"font-size:13=
.5pt;color:black"><img border=3D"0" width=3D"20" style=3D"width: 0.2083in;"=
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r.nl/signature/images/icon_url.jpg"><u></u><u></u></span></p></td><td width=
=3D"20" valign=3D"top" style=3D"width:15pt;padding:0cm"><p class=3D"MsoNorm=
al"><span style=3D"font-size:13.5pt;font-family:Verdana,sans-serif;color:bl=
ack">=C2=A0</span><span style=3D"font-size:13.5pt;color:black"><u></u><u></=
u></span></p></td><td style=3D"padding:0cm"><p class=3D"MsoNormal" style=3D=
"line-height:12pt"><span style=3D"font-size:10pt;color:rgb(88,89,91)"><a hr=
ef=3D"https://www.webpower-group.com/" title=3D"webpower" target=3D"_blank"=
><span style=3D"font-family:Verdana,sans-serif;color:rgb(245,126,55)">https=
://www.webpower-group.com</span></a><u></u><u></u></span></p></td></tr><tr>=
<td width=3D"20" valign=3D"top" style=3D"width:15pt;padding:0cm"><p class=
=3D"MsoNormal"><span style=3D"font-size:13.5pt;font-family:Verdana,sans-ser=
if;color:black">=C2=A0</span><span style=3D"font-size:13.5pt;color:black"><=
u></u><u></u></span></p></td><td width=3D"20" valign=3D"top" style=3D"width=
:15pt;padding:0cm"></td><td valign=3D"top" style=3D"padding:0cm"></td></tr>=
</tbody></table><p class=3D"MsoNormal" style=3D"line-height:12pt"><span sty=
le=3D"font-size:10pt;font-family:&quot;Times New Roman&quot;,serif;color:rg=
b(88,89,91);display:none"><u></u>=C2=A0<u></u></span></p><table class=3D"gm=
ail-m_-8601659734818629330MsoNormalTable" border=3D"0" cellspacing=3D"0" ce=
llpadding=3D"0" width=3D"320" style=3D"width:240pt"><tbody><tr><td valign=
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ize:13.5pt;color:black"><a href=3D"https://www.webpower-group.com/" title=
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n style=3D"font-family:Verdana,sans-serif">=C2=A0</span><u></u><u></u></p><=
/td><td width=3D"24" valign=3D"top" style=3D"width:18pt;padding:0cm"><p cla=
ss=3D"MsoNormal"><a href=3D"https://www.linkedin.com/company/36782/" title=
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if;text-decoration:none"><img border=3D"0" width=3D"24" style=3D"width: 0.2=
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</u><u></u></p></td></tr></tbody></table></td></tr></tbody></table><p class=
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t-family:&quot;Times New Roman&quot;,serif;color:rgb(88,89,91);display:none=
"><u></u>=C2=A0<u></u></span></p><table class=3D"gmail-m_-86016597348186293=
30MsoNormalTable" border=3D"0" cellspacing=3D"0" cellpadding=3D"0" width=3D=
"320" style=3D"width:240pt"><tbody><tr><td width=3D"5" valign=3D"top" style=
=3D"width:3.75pt;padding:0cm"></td><td valign=3D"top" style=3D"border-right=
:none;border-bottom:none;border-left:none;border-top:1pt solid rgb(221,221,=
221);padding:3.75pt 0cm"><p class=3D"MsoNormal" style=3D"line-height:9.75pt=
"><span style=3D"font-size:7pt;font-family:Verdana,sans-serif;color:rgb(88,=
89,91)">Barcelona | Barneveld | Beijing | Chengdu | Guangzhou<br>Hamburg | =
Shanghai | Shenzhen | Stockholm<u></u><u></u></span></p></td><td width=3D"5=
" valign=3D"top" style=3D"width:3.75pt;padding:0cm"><p class=3D"MsoNormal">=
<span style=3D"font-size:13.5pt;font-family:Verdana,sans-serif;color:black"=
>=C2=A0</span><span style=3D"font-size:13.5pt;color:black"><u></u><u></u></=
span></p></td></tr></tbody></table></td></tr></tbody></table><p class=3D"Ms=
oNormal"><span style=3D"font-size:9.5pt;font-family:Arial,sans-serif;color:=
rgb(34,34,34);display:none"><u></u>=C2=A0<u></u></span></p><table class=3D"=
gmail-m_-8601659734818629330MsoNormalTable" border=3D"0" cellspacing=3D"0" =
cellpadding=3D"0" width=3D"320" style=3D"width:240pt"><tbody><tr><td width=
=3D"5" valign=3D"top" style=3D"width:3.75pt;padding:0cm"></td><td valign=3D=
"top" style=3D"border-right:none;border-bottom:none;border-left:none;border=
-top:1pt solid rgb(221,221,221);padding:3.75pt 0cm"><p class=3D"MsoNormal" =
style=3D"line-height:9.75pt"><span style=3D"font-size:7pt;font-family:Verda=
na,sans-serif;color:rgb(88,89,91)"><a href=3D"https://webpower.nl/event/ken=
nissessies/?utm_source=3DGML&amp;utm_medium=3DEMAIL&amp;utm_campaign=3DEVEN=
T&amp;utm_term=3DKNOWLDGS&amp;utm_content=3DNL" title=3D"Webpower Food for =
Thought-kennissessies" target=3D"_blank"><span style=3D"font-size:13.5pt;fo=
nt-family:&quot;Times New Roman&quot;,serif;text-decoration:none"><img bord=
er=3D"0" id=3D"gmail-m_-8601659734818629330_x0000_i1034" src=3D"https://web=
power.nl/signature/images/wp_footer_banner.jpg"></span></a><u></u><u></u></=
span></p></td></tr></tbody></table></div></div></div></div></div></div></di=
v></div></div></div></div></div></div></div></div></div><p class=3D"MsoNorm=
al"><u></u>=C2=A0<u></u></p></div><p class=3D"MsoNormal"><u></u>=C2=A0<u></=
u></p><div><div><p class=3D"MsoNormal">Op ma 17 dec. 2018 om 19:54 schreef =
H=C3=A5kon Alstadheim &lt;<a href=3D"mailto:hakon@alstadheim.priv.no" targe=
t=3D"_blank">hakon@alstadheim.priv.no</a>&gt;:<u></u><u></u></p></div><bloc=
kquote style=3D"border-top:none;border-right:none;border-bottom:none;border=
-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin-left:4.8pt;=
margin-right:0cm"><p class=3D"MsoNormal" style=3D"margin-bottom:12pt"><br>D=
en 17.12.2018 10:32, skrev Roalt Zijlstra | webpower:<br>&gt; Hey H=C3=A5ko=
n,<br>&gt;<br>&gt; One little tip on disk IO in Virtual hosts, is changing =
the FS <br>&gt; scheduler from cfq to noop. In our Xen PV configs we add th=
is to the <br>&gt; xen.cfg files at the end:<br>&gt;<br>&gt; extra=3D&quot;=
clocksource=3Dtsc elevator=3Dnoop&quot;<br>&gt;<br>&gt; Especially the &quo=
t;elevator=3Dnoop&quot; parameter is forcing all FS-es to the <br>&gt; noop=
 scheduler. In my experience that gave our Xenservers a pretty <br>&gt; nic=
e boost.<br>&gt; Red Hat does recoomend this for all Virtual servers (see t=
he link <br>&gt; below). To test this you don&#39;t need to reboot at all.<=
br>&gt;<br>&gt; For example from the link below there is a code snippet abo=
ut getting <br>&gt; and setting the scheduler for /dev/hda. (Replace hda wi=
th sdb or any <br>&gt; other block device)<br>&gt;<br>&gt; # cat /sys/block=
/hda/queue/scheduler<br>&gt; noop anticipatory deadline [cfq]<br>&gt;<br>&g=
t; # echo &#39;noop&#39; &gt; /sys/block/hda/queue/scheduler<br>&gt; # cat =
/sys/block/hda/queue/scheduler<br>&gt; [noop] anticipatory deadline cfq<br>=
&gt;<br>&gt; More info: <a href=3D"https://access.redhat.com/solutions/5427=
" target=3D"_blank">https://access.redhat.com/solutions/5427</a><br><br>Yes=
, found that resource some time ago. Tried again now, no <br>break-through.=
 I&#39;ve got &#39;none&#39; available as scheduler, rather than noop, <br>=
but they should be equal. No matter what I do (in dom0 and/or domu) I <br>g=
et at least 10 x higher speed in the dom0. :-/ .<br><br>Example:<br><br>###=
<br><br>###In dom0, md-raid on drives f j g h i k. echo-and-cat does the ob=
vious.<br><br>### (I usually run with mq-deadline as scheduler. seems to gi=
ve <br>marginally better performance)<br><br># for f in f j g h i k ; do ec=
ho-and-cat <br>/sys/block/sd${f}/queue/scheduler;done<br>/sys/block/sdf/que=
ue/scheduler<br>[none] mq-deadline kyber bfq<br>/sys/block/sdj/queue/schedu=
ler<br>[none] mq-deadline kyber bfq<br>/sys/block/sdg/queue/scheduler<br>[n=
one] mq-deadline kyber bfq<br>/sys/block/sdh/queue/scheduler<br>[none] mq-d=
eadline kyber bfq<br>/sys/block/sdi/queue/scheduler<br>[none] mq-deadline k=
yber bfq<br>/sys/block/sdk/queue/scheduler<br>[none] mq-deadline kyber bfq<=
br># mount /dev/disk/by-label/SAS-STEAM /mnt/tull<br># cd /mnt/tull/tmp<br>=
# df -hT ./<br>Filesystem=C2=A0=C2=A0=C2=A0=C2=A0 Type=C2=A0 Size=C2=A0 Use=
d Avail Use% Mounted on<br>/dev/md2p8=C2=A0=C2=A0=C2=A0=C2=A0 ext4=C2=A0 19=
6G=C2=A0 164G=C2=A0=C2=A0 23G=C2=A0 88% /mnt/tull<br># dd if=3D/dev/zero of=
=3Da_file bs=3D1M count=3D1024 conv=3Dfsync oflag=3Ddirect<br>1024+0 record=
s in<br>1024+0 records out<br>1073741824 bytes (1.1 GB, 1.0 GiB) copied, 4.=
56845 s, 235 MB/s<br>0:root@gentoo tmp # dd if=3D/dev/zero of=3Da_file bs=
=3D1M count=3D1024 <br>conv=3Dfsync oflag=3Ddirect<br>1024+0 records in<br>=
1024+0 records out<br>1073741824 bytes (1.1 GB, 1.0 GiB) copied, 7.52557 s,=
 143 MB/s<br>###<br><br>### Booting domu with root and /tmp on SAS-STEAM, s=
sh into domu<br><br>###<br><br># cd /tmp<br># df -hT ./<br>Filsystem=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 Type St=C3=B8rrelse Brukt Tilgj. Bruk% Montert p=
=C3=A5<br>/dev/xvdb=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ext4=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 196G=C2=A0 163G=C2=A0=C2=A0=C2=A0 24G=C2=A0=C2=A0 88% /<br># cat =
/sys/block/xvdb/<br>alignment_offset=C2=A0=C2=A0 device/=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 holders/ power/=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 <br>ro=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 subsystem/<br>bdi/=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 discard_alignment=C2=A0 in=
flight queue/=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 <br>size=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 trace/<br>capability=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 ext_range=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 integrity/ range=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 <br>slaves/=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 uevent<br>dev=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 hidde=
n=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 m=
q/ removable=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 stat<br>=
# cat /sys/block/xvdb/queue/scheduler<br>[none] mq-deadline<br># cd /tmp<br=
># df -hT ./<br>Filsystem=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Type St=C3=B8rrelse=
 Brukt Tilgj. Bruk% Montert p=C3=A5<br>/dev/xvdb=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 ext4=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 196G=C2=A0 163G=C2=A0=C2=A0=C2=A0 24=
G=C2=A0=C2=A0 88% /<br># cat /sys/block/xvdb/<br>alignment_offset=C2=A0=C2=
=A0 device/=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 holders/ power/=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 <br>ro=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 subsystem/<br>bdi/=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 discard_alignment=C2=A0 inflight queue/=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 <br>size=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 trace/<br>capa=
bility=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ext_range=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 integrity/ range=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 <br>slav=
es/=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ueven=
t<br>dev=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 hidden=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 mq/ removable=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 stat<br># cat /sys/block/xvdb/queue/scheduler<br>[=
none] mq-deadline<br># dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 c=
onv=3Dfsync oflag=3Ddirect<br>1024+0 oppf=C3=B8ringer inn<br>1024+0 oppf=C3=
=B8ringer ut<br>1073741824 byte (1,1 GB, 1,0 GiB) kopiert, 64,2402 s, 16,7 =
MB/s<br># dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 conv=3Dfsync o=
flag=3Ddirect<br>1024+0 oppf=C3=B8ringer inn<br>1024+0 oppf=C3=B8ringer ut<=
br>1073741824 byte (1,1 GB, 1,0 GiB) kopiert, 59,7517 s, 18,0 MB/s<br>#<br>=
<br><br><br><u></u><u></u></p></blockquote></div></div></div></blockquote><=
/div>

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Subject: Re: [Xen-users] Disk performance on guest incredibly low.
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I used another disk benchmark tests:

dd if=3D/dev/zero of=3Da_file bs=3D1G count=3D1 oflag=3Ddsync
dd if=3D/dev/zero of=3Da_file bs=3D512 count=3D1000 oflag=3Ddsync

=20

Then the results between dom0 and domU are much closer related.

=20

Van: Xen-users <xen-users-bounces@lists.xenproject.org> Namens Roalt =
Zijlstra | webpower
Verzonden: Tuesday, 18 December 2018 16:12
Aan: H=C3=A5kon Alstadheim <hakon@alstadheim.priv.no>
CC: xen-users@lists.xenproject.org
Onderwerp: Re: [Xen-users] Disk performance on guest incredibly low.

=20

Hi,

=20

You are definitely running newer kernels then I do.. But I tested that =
with a setting in the grub.cfg I can enable the multi-queue block mode =
by adding 'scsi_mod.use_blk_mq=3D1'.

I would think that if you use 'scsi_mod.use_blk_mq=3D0' you can disable =
the multi-queue block mode.

In general the multi-queue block modes should be better, but it is worth =
a try in combination with Xen to test the single queue block mode.

=20



Best regards,


=20

=20


  <https://www.webpower.nl/signature/images/icon_user.jpg>=20

=20

Roalt Zijlstra


=20

=20

Teamleader Infra & Deliverability


=20

=20

=20


  <https://www.webpower.nl/signature/images/icon_email.jpg>=20

=20

 <mailto:roalt.zijlstra@webpower.nl> roalt.zijlstra@webpower.nl


  <https://www.webpower.nl/signature/images/icon_phone.jpg>=20

=20

+31 342 423 262


  <https://www.webpower.nl/signature/images/icon_skype.jpg>=20

=20

roalt.zijlstra


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Op ma 17 dec. 2018 om 19:54 schreef H=C3=A5kon Alstadheim =
<hakon@alstadheim.priv.no <mailto:hakon@alstadheim.priv.no> >:


Den 17.12.2018 10:32, skrev Roalt Zijlstra | webpower:
> Hey H=C3=A5kon,
>
> One little tip on disk IO in Virtual hosts, is changing the FS=20
> scheduler from cfq to noop. In our Xen PV configs we add this to the=20
> xen.cfg files at the end:
>
> extra=3D"clocksource=3Dtsc elevator=3Dnoop"
>
> Especially the "elevator=3Dnoop" parameter is forcing all FS-es to the =

> noop scheduler. In my experience that gave our Xenservers a pretty=20
> nice boost.
> Red Hat does recoomend this for all Virtual servers (see the link=20
> below). To test this you don't need to reboot at all.
>
> For example from the link below there is a code snippet about getting=20
> and setting the scheduler for /dev/hda. (Replace hda with sdb or any=20
> other block device)
>
> # cat /sys/block/hda/queue/scheduler
> noop anticipatory deadline [cfq]
>
> # echo 'noop' > /sys/block/hda/queue/scheduler
> # cat /sys/block/hda/queue/scheduler
> [noop] anticipatory deadline cfq
>
> More info: https://access.redhat.com/solutions/5427

Yes, found that resource some time ago. Tried again now, no=20
break-through. I've got 'none' available as scheduler, rather than noop, =

but they should be equal. No matter what I do (in dom0 and/or domu) I=20
get at least 10 x higher speed in the dom0. :-/ .

Example:

###

###In dom0, md-raid on drives f j g h i k. echo-and-cat does the =
obvious.

### (I usually run with mq-deadline as scheduler. seems to give=20
marginally better performance)

# for f in f j g h i k ; do echo-and-cat=20
/sys/block/sd${f}/queue/scheduler;done
/sys/block/sdf/queue/scheduler
[none] mq-deadline kyber bfq
/sys/block/sdj/queue/scheduler
[none] mq-deadline kyber bfq
/sys/block/sdg/queue/scheduler
[none] mq-deadline kyber bfq
/sys/block/sdh/queue/scheduler
[none] mq-deadline kyber bfq
/sys/block/sdi/queue/scheduler
[none] mq-deadline kyber bfq
/sys/block/sdk/queue/scheduler
[none] mq-deadline kyber bfq
# mount /dev/disk/by-label/SAS-STEAM /mnt/tull
# cd /mnt/tull/tmp
# df -hT ./
Filesystem     Type  Size  Used Avail Use% Mounted on
/dev/md2p8     ext4  196G  164G   23G  88% /mnt/tull
# dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 conv=3Dfsync =
oflag=3Ddirect
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 4.56845 s, 235 MB/s
0:root@gentoo tmp # dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024=20
conv=3Dfsync oflag=3Ddirect
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 7.52557 s, 143 MB/s
###

### Booting domu with root and /tmp on SAS-STEAM, ssh into domu

###

# cd /tmp
# df -hT ./
Filsystem      Type St=C3=B8rrelse Brukt Tilgj. Bruk% Montert p=C3=A5
/dev/xvdb      ext4      196G  163G    24G   88% /
# cat /sys/block/xvdb/
alignment_offset   device/            holders/ power/            =20
ro                 subsystem/
bdi/               discard_alignment  inflight queue/            =20
size               trace/
capability         ext_range          integrity/ range             =20
slaves/            uevent
dev                hidden             mq/ removable          stat
# cat /sys/block/xvdb/queue/scheduler
[none] mq-deadline
# cd /tmp
# df -hT ./
Filsystem      Type St=C3=B8rrelse Brukt Tilgj. Bruk% Montert p=C3=A5
/dev/xvdb      ext4      196G  163G    24G   88% /
# cat /sys/block/xvdb/
alignment_offset   device/            holders/ power/            =20
ro                 subsystem/
bdi/               discard_alignment  inflight queue/            =20
size               trace/
capability         ext_range          integrity/ range             =20
slaves/            uevent
dev                hidden             mq/ removable          stat
# cat /sys/block/xvdb/queue/scheduler
[none] mq-deadline
# dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 conv=3Dfsync =
oflag=3Ddirect
1024+0 oppf=C3=B8ringer inn
1024+0 oppf=C3=B8ringer ut
1073741824 byte (1,1 GB, 1,0 GiB) kopiert, 64,2402 s, 16,7 MB/s
# dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 conv=3Dfsync =
oflag=3Ddirect
1024+0 oppf=C3=B8ringer inn
1024+0 oppf=C3=B8ringer ut
1073741824 byte (1,1 GB, 1,0 GiB) kopiert, 59,7517 s, 18,0 MB/s
#






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</o:shapelayout></xml><![endif]--></head><body lang=3Den-NL link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'mso-fareast-language:EN-US'>I used another disk =
benchmark tests:<o:p></o:p></span></p><pre =
style=3D'background:#EFF0F1;vertical-align:baseline'><code><span =
lang=3Den-NL style=3D'font-family:Consolas;color:#242729;border:none =
windowtext 1.0pt;padding:0cm;background:#EFF0F1'>dd if=3D/dev/zero =
of=3Da_file bs=3D1G count=3D1 =
oflag=3Ddsync<o:p></o:p></span></code></pre><pre =
style=3D'background:#EFF0F1;vertical-align:baseline'><code><span =
lang=3Den-NL style=3D'font-family:Consolas;color:#242729;border:none =
windowtext 1.0pt;padding:0cm;background:#EFF0F1'>dd if=3D/dev/zero =
of=3Da_file bs=3D512 count=3D1000 =
oflag=3Ddsync<o:p></o:p></span></code></pre><p class=3DMsoNormal><span =
lang=3Den-NL =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-GB =
style=3D'mso-fareast-language:EN-US'>Then the results between dom0 and =
domU are much closer related.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><b><span lang=3DNL>Van:</span></b><span lang=3DNL> =
Xen-users &lt;xen-users-bounces@lists.xenproject.org&gt; <b>Namens =
</b>Roalt Zijlstra | webpower<br><b>Verzonden:</b> Tuesday, 18 December =
2018 16:12<br><b>Aan:</b> H=C3=A5kon Alstadheim =
&lt;hakon@alstadheim.priv.no&gt;<br><b>CC:</b> =
xen-users@lists.xenproject.org<br><b>Onderwerp:</b> Re: [Xen-users] Disk =
performance on guest incredibly low.<o:p></o:p></span></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'>Hi,<o:p></o:p><=
/span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'><o:p>&nbsp;</o:=
p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-family:"Arial",sans-serif'>You are definitely running =
newer kernels then I do.. But I tested that with a setting in the =
grub.cfg I can enable the multi-queue block mode by =
adding</span>&nbsp;'scsi_mod.use_blk_mq=3D1'.<o:p></o:p></p></div><div><p=
 class=3DMsoNormal>I would think that if you use =
'scsi_mod.use_blk_mq=3D0' you can disable the multi-queue block =
mode.<o:p></o:p></p></div><div><p class=3DMsoNormal>In general the =
multi-queue block modes should be better, but it is worth a try in =
combination with Xen to test the single queue block =
mode.<o:p></o:p></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'><o:p>&nbsp;</o:=
p></span></p></div><div><div><div><div><div><div><div><div><div><div><div=
><div><div><div><div><div><table class=3DMsoNormalTable border=3D0 =
cellspacing=3D0 cellpadding=3D0 width=3D"100%" =
style=3D'width:100.0%'><tr><td valign=3Dtop style=3D'padding:0cm 0cm 0cm =
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style=3D'line-height:12.0pt'><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:#58595B'=
>Best regards,</span><span style=3D'font-size:10.0pt;font-family:"Times =
New Roman",serif;color:#58595B'><span =
style=3D'color:white'><o:p></o:p></span></span></p></td></tr><tr><td =
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class=3DMsoNormal><span =
style=3D'font-size:13.5pt;font-family:"Verdana",sans-serif;color:black'>&=
nbsp;</span><span =
style=3D'font-size:13.5pt;color:black'><o:p></o:p></span></p></td><td =
style=3D'padding:0cm 0cm 0cm 0cm'><p class=3DMsoNormal =
style=3D'line-height:12.0pt'><span =
style=3D'font-size:10.0pt;color:#58595B'><a =
href=3D"https://www.webpower-group.com/" target=3D"_blank" =
title=3Dwebpower><span =
style=3D'font-family:"Verdana",sans-serif;color:#F57E37'>https://www.webp=
ower-group.com</span></a><o:p></o:p></span></p></td></tr><tr><td =
width=3D20 valign=3Dtop style=3D'width:15.0pt;padding:0cm 0cm 0cm =
0cm'><p class=3DMsoNormal><span =
style=3D'font-size:13.5pt;font-family:"Verdana",sans-serif;color:black'>&=
nbsp;</span><span =
style=3D'font-size:13.5pt;color:black'><o:p></o:p></span></p></td><td =
width=3D20 valign=3Dtop style=3D'width:15.0pt;padding:0cm 0cm 0cm =
0cm'></td><td valign=3Dtop style=3D'padding:0cm 0cm 0cm =
0cm'></td></tr></table><p class=3DMsoNormal =
style=3D'line-height:12.0pt'><span =
style=3D'font-size:10.0pt;font-family:"Times New =
Roman",serif;color:#58595B;display:none'><o:p>&nbsp;</o:p></span></p><tab=
le class=3DMsoNormalTable border=3D0 cellspacing=3D0 cellpadding=3D0 =
width=3D320 style=3D'width:240.0pt'><tr><td valign=3Dtop =
style=3D'padding:0cm 0cm 0cm 0cm'><p class=3DMsoNormal><span =
style=3D'font-size:13.5pt;color:black'><a =
href=3D"https://www.webpower-group.com/" target=3D"_blank" =
title=3DWebpower><span =
style=3D'font-family:"Verdana",sans-serif;text-decoration:none'><img =
border=3D0 width=3D202 style=3D'width:2.1041in' id=3D"_x0000_i1030" =
src=3D"https://www.webpower.nl/signature/images/webpower.jpg"></span></a>=
<o:p></o:p></span></p></td></tr><tr style=3D'height:7.5pt'><td =
valign=3Dtop style=3D'padding:0cm 0cm 0cm 0cm;height:7.5pt'><p =
class=3DMsoNormal style=3D'mso-line-height-alt:7.5pt'><span =
style=3D'font-size:13.5pt;font-family:"Verdana",sans-serif;color:black'>&=
nbsp;</span><span =
style=3D'font-size:13.5pt;color:black'><o:p></o:p></span></p></td></tr><t=
r><td valign=3Dtop style=3D'padding:0cm 0cm 0cm 0cm'><table =
class=3DMsoNormalTable border=3D0 cellspacing=3D0 =
cellpadding=3D0><tr><td width=3D24 valign=3Dtop =
style=3D'width:18.0pt;padding:0cm 0cm 0cm 0cm'><p class=3DMsoNormal><a =
href=3D"https://www.facebook.com/webpower.marketingautomation/" =
target=3D"_blank" title=3DFacebook><span =
style=3D'font-family:"Verdana",sans-serif;text-decoration:none'><img =
border=3D0 width=3D24 style=3D'width:.25in' id=3D"_x0000_i1031" =
src=3D"https://www.webpower.nl/signature/images/wp_facebook.jpg" =
alt=3DFacebook></span></a><o:p></o:p></p></td><td width=3D10 =
valign=3Dtop style=3D'width:7.5pt;padding:0cm 0cm 0cm 0cm'><p =
class=3DMsoNormal><span =
style=3D'font-family:"Verdana",sans-serif'>&nbsp;</span><o:p></o:p></p></=
td><td width=3D24 valign=3Dtop style=3D'width:18.0pt;padding:0cm 0cm 0cm =
0cm'><p class=3DMsoNormal><a href=3D"https://twitter.com/webpower" =
target=3D"_blank" title=3DTwitter><span =
style=3D'font-family:"Verdana",sans-serif;text-decoration:none'><img =
border=3D0 width=3D24 style=3D'width:.25in' id=3D"_x0000_i1032" =
src=3D"https://www.webpower.nl/signature/images/wp_twitter.jpg" =
alt=3DTwitter></span></a><o:p></o:p></p></td><td width=3D10 valign=3Dtop =
style=3D'width:7.5pt;padding:0cm 0cm 0cm 0cm'><p class=3DMsoNormal><span =
style=3D'font-family:"Verdana",sans-serif'>&nbsp;</span><o:p></o:p></p></=
td><td width=3D24 valign=3Dtop style=3D'width:18.0pt;padding:0cm 0cm 0cm =
0cm'><p class=3DMsoNormal><a =
href=3D"https://www.linkedin.com/company/36782/" target=3D"_blank" =
title=3DLinkedin><span =
style=3D'font-family:"Verdana",sans-serif;text-decoration:none'><img =
border=3D0 width=3D24 style=3D'width:.25in' id=3D"_x0000_i1033" =
src=3D"https://www.webpower.nl/signature/images/wp_linkedin.jpg" =
alt=3DLinkedin></span></a><o:p></o:p></p></td></tr></table></td></tr></ta=
ble><p class=3DMsoNormal style=3D'line-height:12.0pt'><span =
style=3D'font-size:10.0pt;font-family:"Times New =
Roman",serif;color:#58595B;display:none'><o:p>&nbsp;</o:p></span></p><tab=
le class=3DMsoNormalTable border=3D0 cellspacing=3D0 cellpadding=3D0 =
width=3D320 style=3D'width:240.0pt'><tr><td width=3D5 valign=3Dtop =
style=3D'width:3.75pt;padding:0cm 0cm 0cm 0cm'></td><td valign=3Dtop =
style=3D'border:none;border-top:solid #DDDDDD 1.0pt;padding:3.75pt 0cm =
3.75pt 0cm'><p class=3DMsoNormal style=3D'line-height:9.75pt'><span =
style=3D'font-size:7.0pt;font-family:"Verdana",sans-serif;color:#58595B'>=
Barcelona | Barneveld | Beijing | Chengdu | Guangzhou<br>Hamburg | =
Shanghai | Shenzhen | Stockholm<o:p></o:p></span></p></td><td width=3D5 =
valign=3Dtop style=3D'width:3.75pt;padding:0cm 0cm 0cm 0cm'><p =
class=3DMsoNormal><span =
style=3D'font-size:13.5pt;font-family:"Verdana",sans-serif;color:black'>&=
nbsp;</span><span =
style=3D'font-size:13.5pt;color:black'><o:p></o:p></span></p></td></tr></=
table></td></tr></table><p class=3DMsoNormal><span =
style=3D'font-size:9.5pt;font-family:"Arial",sans-serif;color:#222222;dis=
play:none'><o:p>&nbsp;</o:p></span></p><table class=3DMsoNormalTable =
border=3D0 cellspacing=3D0 cellpadding=3D0 width=3D320 =
style=3D'width:240.0pt'><tr><td width=3D5 valign=3Dtop =
style=3D'width:3.75pt;padding:0cm 0cm 0cm 0cm'></td><td valign=3Dtop =
style=3D'border:none;border-top:solid #DDDDDD 1.0pt;padding:3.75pt 0cm =
3.75pt 0cm'><p class=3DMsoNormal style=3D'line-height:9.75pt'><span =
style=3D'font-size:7.0pt;font-family:"Verdana",sans-serif;color:#58595B'>=
<a =
href=3D"https://webpower.nl/event/kennissessies/?utm_source=3DGML&amp;utm=
_medium=3DEMAIL&amp;utm_campaign=3DEVENT&amp;utm_term=3DKNOWLDGS&amp;utm_=
content=3DNL" target=3D"_blank" title=3D"Webpower Food for =
Thought-kennissessies"><span =
style=3D'font-size:13.5pt;font-family:"Times New =
Roman",serif;text-decoration:none'><img border=3D0 id=3D"_x0000_i1034" =
src=3D"https://webpower.nl/signature/images/wp_footer_banner.jpg"></span>=
</a><o:p></o:p></span></p></td></tr></table></div></div></div></div></div=
></div></div></div></div></div></div></div></div></div></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p class=3DMsoNormal>Op =
ma 17 dec. 2018 om 19:54 schreef H=C3=A5kon Alstadheim &lt;<a =
href=3D"mailto:hakon@alstadheim.priv.no">hakon@alstadheim.priv.no</a>&gt;=
:<o:p></o:p></p></div><blockquote style=3D'border:none;border-left:solid =
#CCCCCC 1.0pt;padding:0cm 0cm 0cm =
6.0pt;margin-left:4.8pt;margin-right:0cm'><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><br>Den 17.12.2018 10:32, skrev Roalt =
Zijlstra | webpower:<br>&gt; Hey H=C3=A5kon,<br>&gt;<br>&gt; One little =
tip on disk IO in Virtual hosts, is changing the FS <br>&gt; scheduler =
from cfq to noop. In our Xen PV configs we add this to the <br>&gt; =
xen.cfg files at the end:<br>&gt;<br>&gt; =
extra=3D&quot;clocksource=3Dtsc elevator=3Dnoop&quot;<br>&gt;<br>&gt; =
Especially the &quot;elevator=3Dnoop&quot; parameter is forcing all =
FS-es to the <br>&gt; noop scheduler. In my experience that gave our =
Xenservers a pretty <br>&gt; nice boost.<br>&gt; Red Hat does recoomend =
this for all Virtual servers (see the link <br>&gt; below). To test this =
you don't need to reboot at all.<br>&gt;<br>&gt; For example from the =
link below there is a code snippet about getting <br>&gt; and setting =
the scheduler for /dev/hda. (Replace hda with sdb or any <br>&gt; other =
block device)<br>&gt;<br>&gt; # cat =
/sys/block/hda/queue/scheduler<br>&gt; noop anticipatory deadline =
[cfq]<br>&gt;<br>&gt; # echo 'noop' &gt; =
/sys/block/hda/queue/scheduler<br>&gt; # cat =
/sys/block/hda/queue/scheduler<br>&gt; [noop] anticipatory deadline =
cfq<br>&gt;<br>&gt; More info: <a =
href=3D"https://access.redhat.com/solutions/5427" =
target=3D"_blank">https://access.redhat.com/solutions/5427</a><br><br>Yes=
, found that resource some time ago. Tried again now, no =
<br>break-through. I've got 'none' available as scheduler, rather than =
noop, <br>but they should be equal. No matter what I do (in dom0 and/or =
domu) I <br>get at least 10 x higher speed in the dom0. :-/ =
.<br><br>Example:<br><br>###<br><br>###In dom0, md-raid on drives f j g =
h i k. echo-and-cat does the obvious.<br><br>### (I usually run with =
mq-deadline as scheduler. seems to give <br>marginally better =
performance)<br><br># for f in f j g h i k ; do echo-and-cat =
<br>/sys/block/sd${f}/queue/scheduler;done<br>/sys/block/sdf/queue/schedu=
ler<br>[none] mq-deadline kyber =
bfq<br>/sys/block/sdj/queue/scheduler<br>[none] mq-deadline kyber =
bfq<br>/sys/block/sdg/queue/scheduler<br>[none] mq-deadline kyber =
bfq<br>/sys/block/sdh/queue/scheduler<br>[none] mq-deadline kyber =
bfq<br>/sys/block/sdi/queue/scheduler<br>[none] mq-deadline kyber =
bfq<br>/sys/block/sdk/queue/scheduler<br>[none] mq-deadline kyber =
bfq<br># mount /dev/disk/by-label/SAS-STEAM /mnt/tull<br># cd =
/mnt/tull/tmp<br># df -hT ./<br>Filesystem&nbsp;&nbsp;&nbsp;&nbsp; =
Type&nbsp; Size&nbsp; Used Avail Use% Mounted =
on<br>/dev/md2p8&nbsp;&nbsp;&nbsp;&nbsp; ext4&nbsp; 196G&nbsp; =
164G&nbsp;&nbsp; 23G&nbsp; 88% /mnt/tull<br># dd if=3D/dev/zero =
of=3Da_file bs=3D1M count=3D1024 conv=3Dfsync oflag=3Ddirect<br>1024+0 =
records in<br>1024+0 records out<br>1073741824 bytes (1.1 GB, 1.0 GiB) =
copied, 4.56845 s, 235 MB/s<br>0:root@gentoo tmp # dd if=3D/dev/zero =
of=3Da_file bs=3D1M count=3D1024 <br>conv=3Dfsync =
oflag=3Ddirect<br>1024+0 records in<br>1024+0 records out<br>1073741824 =
bytes (1.1 GB, 1.0 GiB) copied, 7.52557 s, 143 MB/s<br>###<br><br>### =
Booting domu with root and /tmp on SAS-STEAM, ssh into =
domu<br><br>###<br><br># cd /tmp<br># df -hT =
./<br>Filsystem&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Type St=C3=B8rrelse Brukt =
Tilgj. Bruk% Montert p=C3=A5<br>/dev/xvdb&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
ext4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 196G&nbsp; 163G&nbsp;&nbsp;&nbsp; =
24G&nbsp;&nbsp; 88% /<br># cat =
/sys/block/xvdb/<br>alignment_offset&nbsp;&nbsp; =
device/&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 holders/ =
power/&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp; =
<br>ro&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
subsystem/<br>bdi/&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp; discard_alignment&nbsp; inflight =
queue/&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp; =
<br>size&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp; =
trace/<br>capability&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
ext_range&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
integrity/ =
range&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; =
<br>slaves/&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp; =
uevent<br>dev&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
hidden&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp; mq/ =
removable&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
stat<br># cat /sys/block/xvdb/queue/scheduler<br>[none] mq-deadline<br># =
cd /tmp<br># df -hT ./<br>Filsystem&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Type =
St=C3=B8rrelse Brukt Tilgj. Bruk% Montert =
p=C3=A5<br>/dev/xvdb&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
ext4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 196G&nbsp; 163G&nbsp;&nbsp;&nbsp; =
24G&nbsp;&nbsp; 88% /<br># cat =
/sys/block/xvdb/<br>alignment_offset&nbsp;&nbsp; =
device/&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 holders/ =
power/&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp; =
<br>ro&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
subsystem/<br>bdi/&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp; discard_alignment&nbsp; inflight =
queue/&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp; =
<br>size&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp; =
trace/<br>capability&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
ext_range&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
integrity/ =
range&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; =
<br>slaves/&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp; =
uevent<br>dev&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
hidden&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp; mq/ =
removable&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
stat<br># cat /sys/block/xvdb/queue/scheduler<br>[none] mq-deadline<br># =
dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 conv=3Dfsync =
oflag=3Ddirect<br>1024+0 oppf=C3=B8ringer inn<br>1024+0 oppf=C3=B8ringer =
ut<br>1073741824 byte (1,1 GB, 1,0 GiB) kopiert, 64,2402 s, 16,7 =
MB/s<br># dd if=3D/dev/zero of=3Da_file bs=3D1M count=3D1024 =
conv=3Dfsync oflag=3Ddirect<br>1024+0 oppf=C3=B8ringer inn<br>1024+0 =
oppf=C3=B8ringer ut<br>1073741824 byte (1,1 GB, 1,0 GiB) kopiert, =
59,7517 s, 18,0 =
MB/s<br>#<br><br><br><br><o:p></o:p></p></blockquote></div></div></body><=
/html>
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Subject: Re: [Xen-users] gfx-passthrough in qubesOS
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From: Mark Pryor <tlviewer@yahoo.com>
To: xen-users@lists.xenproject.org,  <frm@gordijn.org>
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Subject: Re: [Xen-users] Xen performance on guest with LV/SSD very low.
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It appears you are on Stretch with a self-built xen-4.11.
Can you clarify if you have used `make debball` and installed from a *.deb?

and check that no remnants of a distro install are still present:
>dpkg -l | grep -P '^ii|^hi' | grep -P 'qemu|xen'
=20
thanks,
PryMar56
##xen-packaging on Freenode IRC

    On Sunday, December 23, 2018, 12:09:55 PM PST, <frm@gordijn.org> wrote:=
 =20
=20
 Hi,

The past few days, I have scratched my head regarding very disk IO
performance on Xen.
I have installed KVM on the same machine, same result: very low disk IO.

With iozone on Dom0 I easily 180 MB/s, in a pv guest only 2MB/s. The Dom0 i=
s
90 times faster.
I tried many things, but I can not find the solution:

OS dom0: 4.18.0-0.bpo.1-amd64
Xen: 4.11.1

Command line: loglvl=3Dall dom0_mem=3D2048M dom0_max_vcpus=3D2 dom0_vcpus_p=
in
iommu=3D1 ucode=3Dscan gnttab_max_frames=3D256

Guest:
OS: 4.18.0-0.bpo.1-amd64
lsmod | grep blk
xen_blkfront=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 40960=C2=A0 1

What am Ii missing here?

Thanks,

-- Jaap


_______________________________________________
Xen-users mailing list
Xen-users@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo/xen-users =20
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<html><head></head><body><div class=3D"ydp340b9a5byahoo-style-wrap" style=
=3D"font-family: Helvetica Neue,Helvetica,Arial,sans-serif; font-size: 13px=
;"><div>It appears you are on Stretch with a self-built xen-4.11.<br><div>C=
an you clarify if you have used `make debball` and installed from a *.deb?<=
br><div><br><div>and check that no remnants of a distro install are still p=
resent:<br><span>&gt;dpkg -l | grep -P '^ii|^hi' | grep -P 'qemu|xen'</span=
><br></div></div></div></div><div></div>
        <div><br><div>thanks,<br><div>PryMar56<br>##xen-packaging on Freeno=
de IRC<br></div></div></div><div><br></div>
       =20
        </div><div id=3D"yahoo_quoted_5651228723" class=3D"yahoo_quoted">
            <div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
               =20
                <div>
                    On Sunday, December 23, 2018, 12:09:55 PM PST,  &lt;frm=
@gordijn.org&gt; wrote:
                </div>
                <div><br></div>
                <div><br></div>
                <div><div dir=3D"ltr">Hi,<br></div><div dir=3D"ltr"><br></d=
iv><div dir=3D"ltr">The past few days, I have scratched my head regarding v=
ery disk IO<br></div><div dir=3D"ltr">performance on Xen.<br></div><div dir=
=3D"ltr">I have installed KVM on the same machine, same result: very low di=
sk IO.<br></div><div dir=3D"ltr"><br></div><div dir=3D"ltr">With iozone on =
Dom0 I easily 180 MB/s, in a pv guest only 2MB/s. The Dom0 is<br></div><div=
 dir=3D"ltr">90 times faster.<br></div><div dir=3D"ltr">I tried many things=
, but I can not find the solution:<br></div><div dir=3D"ltr"><br></div><div=
 dir=3D"ltr">OS dom0: 4.18.0-0.bpo.1-amd64<br></div><div dir=3D"ltr">Xen: 4=
.11.1<br></div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Command line: lo=
glvl=3Dall dom0_mem=3D2048M dom0_max_vcpus=3D2 dom0_vcpus_pin<br></div><div=
 dir=3D"ltr">iommu=3D1 ucode=3Dscan gnttab_max_frames=3D256<br></div><div d=
ir=3D"ltr"><br></div><div dir=3D"ltr">Guest:<br></div><div dir=3D"ltr">OS: =
4.18.0-0.bpo.1-amd64<br></div><div dir=3D"ltr">lsmod | grep blk<br></div><d=
iv dir=3D"ltr">xen_blkfront&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;  40960&nbsp; =
1<br></div><div dir=3D"ltr"><br></div><div dir=3D"ltr">What am Ii missing h=
ere?<br></div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Thanks,<br></div>=
<div dir=3D"ltr"><br></div><div dir=3D"ltr">-- Jaap<br></div><div dir=3D"lt=
r"><br></div><div dir=3D"ltr"><br></div><div dir=3D"ltr">__________________=
_____________________________<br></div><div dir=3D"ltr">Xen-users mailing l=
ist<br></div><div dir=3D"ltr"><a ymailto=3D"mailto:Xen-users@lists.xenproje=
ct.org" href=3D"mailto:Xen-users@lists.xenproject.org">Xen-users@lists.xenp=
roject.org</a><br></div><div dir=3D"ltr"><a href=3D"https://lists.xenprojec=
t.org/mailman/listinfo/xen-users" target=3D"_blank">https://lists.xenprojec=
t.org/mailman/listinfo/xen-users</a></div></div>
            </div>
        </div></body></html>
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Subject: Re: [Xen-users] Xen performance on guest with LV/SSD very low.
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I am on stretch with a self compiled Xen to try to solve the problem.

Did

Make debball

And installed from the generated deb

=20

>dpkg -l | grep -P '^ii|^hi' | grep -P 'qemu|xen'  results in

ii  grub-xen-bin                       2.02~beta3-5+deb9u1            =
amd64        GRand Unified Bootloader, version 2 (Xen binaries)

ii  grub-xen-host                      2.02~beta3-5+deb9u1            =
amd64        GRand Unified Bootloader, version 2 (Xen host version)

ii  ipxe-qemu                          1.0.0+git-20161027.b991c67-1   =
all          PXE boot firmware - ROM images for qemu

ii  qemu-system-common                 1:2.8+dfsg-6+deb9u5            =
amd64        QEMU full system emulation binaries (common files)

ii  qemu-utils                         1:2.8+dfsg-6+deb9u5            =
amd64        QEMU utilities

ii  xen-upstream                       4.11.1                         =
amd64        Xen upstream testing build snapshot

=20

=20

Van: Mark Pryor <tlviewer@yahoo.com>=20
Verzonden: Sunday, 23 December 2018 22:38
Aan: xen-users@lists.xenproject.org; frm@gordijn.org
Onderwerp: Re: [Xen-users] Xen performance on guest with LV/SSD very =
low.

=20

It appears you are on Stretch with a self-built xen-4.11.

Can you clarify if you have used `make debball` and installed from a =
*.deb?

=20

and check that no remnants of a distro install are still present:
>dpkg -l | grep -P '^ii|^hi' | grep -P 'qemu|xen'

=20

thanks,

PryMar56
##xen-packaging on Freenode IRC

=20

On Sunday, December 23, 2018, 12:09:55 PM PST, <frm@gordijn.org =
<mailto:frm@gordijn.org> > wrote:=20

=20

=20

Hi,

=20

The past few days, I have scratched my head regarding very disk IO

performance on Xen.

I have installed KVM on the same machine, same result: very low disk IO.

=20

With iozone on Dom0 I easily 180 MB/s, in a pv guest only 2MB/s. The =
Dom0 is

90 times faster.

I tried many things, but I can not find the solution:

=20

OS dom0: 4.18.0-0.bpo.1-amd64

Xen: 4.11.1

=20

Command line: loglvl=3Dall dom0_mem=3D2048M dom0_max_vcpus=3D2 =
dom0_vcpus_pin

iommu=3D1 ucode=3Dscan gnttab_max_frames=3D256

=20

Guest:

OS: 4.18.0-0.bpo.1-amd64

lsmod | grep blk

xen_blkfront          40960  1

=20

What am Ii missing here?

=20

Thanks,

=20

-- Jaap

=20

=20

_______________________________________________

Xen-users mailing list

Xen-users@lists.xenproject.org <mailto:Xen-users@lists.xenproject.org>=20

https://lists.xenproject.org/mailman/listinfo/xen-users


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<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body lang=3Den-NL link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'mso-fareast-language:EN-US'>I am on stretch with a =
self compiled Xen to try to solve the problem.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>Did<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>Make =
debball<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>And installed from the generated =
deb<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica Neue"'>&gt;dpkg -l | =
grep -P '^ii|^hi' | grep -P 'qemu|xen'</span><span lang=3DEN-GB =
style=3D'font-size:10.0pt;font-family:"Helvetica Neue"'>&nbsp; results =
in</span><span lang=3DEN-GB =
style=3D'mso-fareast-language:EN-US'><o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>ii&nbsp; =
grub-xen-bin&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
2.02~beta3-5+deb9u1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; amd64&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; GRand =
Unified Bootloader, version 2 (Xen binaries)<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>ii&nbsp; =
grub-xen-host&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
2.02~beta3-5+deb9u1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; amd64&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; GRand =
Unified Bootloader, version 2 (Xen host version)<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>ii&nbsp; =
ipxe-qemu&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;1.0.0+git-20161027.b991c67-1&nbsp;&nbsp; =
all&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; PXE boot =
firmware - ROM images for qemu<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>ii&nbsp; =
qemu-system-common&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
1:2.8+dfsg-6+deb9u5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; amd64&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; QEMU full =
system emulation binaries (common files)<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>ii&nbsp; =
qemu-utils&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1:2.8+dfsg-6+deb9u5&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
amd64&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; QEMU =
utilities<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>ii&nbsp; =
xen-upstream&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
4.11.1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp; amd64&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Xen upstream =
testing build snapshot<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><div><di=
v style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span lang=3DNL>Van:</span></b><span =
lang=3DNL> Mark Pryor &lt;tlviewer@yahoo.com&gt; <br><b>Verzonden:</b> =
Sunday, 23 December 2018 22:38<br><b>Aan:</b> =
xen-users@lists.xenproject.org; frm@gordijn.org<br><b>Onderwerp:</b> Re: =
[Xen-users] Xen performance on guest with LV/SSD very =
low.<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue"'>It appears you are on Stretch with a self-built =
xen-4.11.<o:p></o:p></span></p><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Helvetica Neue"'>Can you clarify =
if you have used `make debball` and installed from a =
*.deb?<o:p></o:p></span></p><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue"'><o:p>&nbsp;</o:p></span></p><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Helvetica Neue"'>and check that =
no remnants of a distro install are still present:<br>&gt;dpkg -l | grep =
-P '^ii|^hi' | grep -P =
'qemu|xen'<o:p></o:p></span></p></div></div></div></div><div><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue"'><o:p>&nbsp;</o:p></span></p><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue"'>thanks,<o:p></o:p></span></p><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue"'>PryMar56<br>##xen-packaging on Freenode =
IRC<o:p></o:p></span></p></div></div></div><div><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue"'><o:p>&nbsp;</o:p></span></p></div></div><div =
id=3D"yahoo_quoted_5651228723"><div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Helvetica Neue";color:#26282A'>On =
Sunday, December 23, 2018, 12:09:55 PM PST, &lt;<a =
href=3D"mailto:frm@gordijn.org">frm@gordijn.org</a>&gt; wrote: =
<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'><o:p>&nbsp;</o:p></span></p></div><div><div><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>Hi,<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>The past few days, I have scratched my head =
regarding very disk IO<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>performance on =
Xen.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Helvetica Neue";color:#26282A'>I =
have installed KVM on the same machine, same result: very low disk =
IO.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>With iozone on Dom0 I easily 180 MB/s, in a pv =
guest only 2MB/s. The Dom0 is<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>90 times faster.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>I tried many things, but I can not find the =
solution:<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>OS dom0: =
4.18.0-0.bpo.1-amd64<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>Xen: 4.11.1<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>Command line: loglvl=3Dall dom0_mem=3D2048M =
dom0_max_vcpus=3D2 dom0_vcpus_pin<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>iommu=3D1 ucode=3Dscan =
gnttab_max_frames=3D256<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>Guest:<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>OS: =
4.18.0-0.bpo.1-amd64<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>lsmod | grep blk<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>xen_blkfront&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
40960&nbsp; 1<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>What am Ii missing =
here?<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>Thanks,<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>-- Jaap<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>_______________________________________________<o:p>=
</o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>Xen-users mailing =
list<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Helvetica Neue";color:#26282A'><a =
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.org</a><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
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Subject: Re: [Xen-users] Xen performance on guest with LV/SSD very low.
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Problem solved.

=20

Using the mount option sync in /etc/fstab on guests is not good for =
performance if you are using a SSD.

Now used async as mount option and achieving near native performance.

=20

Van: Xen-users <xen-users-bounces@lists.xenproject.org> Namens =
frm@gordijn.org
Verzonden: Sunday, 23 December 2018 23:30
Aan: 'Mark Pryor' <tlviewer@yahoo.com>; xen-users@lists.xenproject.org; =
frm@gordijn.org
Onderwerp: Re: [Xen-users] Xen performance on guest with LV/SSD very =
low.

=20

I am on stretch with a self compiled Xen to try to solve the problem.

Did

Make debball

And installed from the generated deb

=20

>dpkg -l | grep -P '^ii|^hi' | grep -P 'qemu|xen'  results in

ii  grub-xen-bin                       2.02~beta3-5+deb9u1            =
amd64        GRand Unified Bootloader, version 2 (Xen binaries)

ii  grub-xen-host                      2.02~beta3-5+deb9u1            =
amd64        GRand Unified Bootloader, version 2 (Xen host version)

ii  ipxe-qemu                          1.0.0+git-20161027.b991c67-1   =
all          PXE boot firmware - ROM images for qemu

ii  qemu-system-common                 1:2.8+dfsg-6+deb9u5            =
amd64        QEMU full system emulation binaries (common files)

ii  qemu-utils                         1:2.8+dfsg-6+deb9u5            =
amd64        QEMU utilities

ii  xen-upstream                       4.11.1                         =
amd64        Xen upstream testing build snapshot

=20

=20

Van: Mark Pryor <tlviewer@yahoo.com <mailto:tlviewer@yahoo.com> >=20
Verzonden: Sunday, 23 December 2018 22:38
Aan: xen-users@lists.xenproject.org =
<mailto:xen-users@lists.xenproject.org> ; frm@gordijn.org =
<mailto:frm@gordijn.org>=20
Onderwerp: Re: [Xen-users] Xen performance on guest with LV/SSD very =
low.

=20

It appears you are on Stretch with a self-built xen-4.11.

Can you clarify if you have used `make debball` and installed from a =
*.deb?

=20

and check that no remnants of a distro install are still present:
>dpkg -l | grep -P '^ii|^hi' | grep -P 'qemu|xen'

=20

thanks,

PryMar56
##xen-packaging on Freenode IRC

=20

On Sunday, December 23, 2018, 12:09:55 PM PST, <frm@gordijn.org =
<mailto:frm@gordijn.org> > wrote:=20

=20

=20

Hi,

=20

The past few days, I have scratched my head regarding very disk IO

performance on Xen.

I have installed KVM on the same machine, same result: very low disk IO.

=20

With iozone on Dom0 I easily 180 MB/s, in a pv guest only 2MB/s. The =
Dom0 is

90 times faster.

I tried many things, but I can not find the solution:

=20

OS dom0: 4.18.0-0.bpo.1-amd64

Xen: 4.11.1

=20

Command line: loglvl=3Dall dom0_mem=3D2048M dom0_max_vcpus=3D2 =
dom0_vcpus_pin

iommu=3D1 ucode=3Dscan gnttab_max_frames=3D256

=20

Guest:

OS: 4.18.0-0.bpo.1-amd64

lsmod | grep blk

xen_blkfront          40960  1

=20

What am Ii missing here?

=20

Thanks,

=20

-- Jaap

=20

=20

_______________________________________________

Xen-users mailing list

Xen-users@lists.xenproject.org <mailto:Xen-users@lists.xenproject.org>=20

https://lists.xenproject.org/mailman/listinfo/xen-users


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<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body lang=3Den-NL link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'mso-fareast-language:EN-US'>Problem =
solved.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>Using the mount option sync in =
/etc/fstab on guests is not good for performance if you are using a =
SSD.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>Now used async as mount option and =
achieving near native performance.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><div><di=
v style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span lang=3DNL>Van:</span></b><span =
lang=3DNL> Xen-users &lt;xen-users-bounces@lists.xenproject.org&gt; =
<b>Namens </b>frm@gordijn.org<br><b>Verzonden:</b> Sunday, 23 December =
2018 23:30<br><b>Aan:</b> 'Mark Pryor' &lt;tlviewer@yahoo.com&gt;; =
xen-users@lists.xenproject.org; frm@gordijn.org<br><b>Onderwerp:</b> Re: =
[Xen-users] Xen performance on guest with LV/SSD very =
low.<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'mso-fareast-language:EN-US'>I am on stretch with a =
self compiled Xen to try to solve the problem.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>Did<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>Make =
debball<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>And installed from the generated =
deb<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica Neue"'>&gt;dpkg -l | =
grep -P '^ii|^hi' | grep -P 'qemu|xen'</span><span lang=3DEN-GB =
style=3D'font-size:10.0pt;font-family:"Helvetica Neue"'>&nbsp; results =
in</span><span lang=3DEN-GB =
style=3D'mso-fareast-language:EN-US'><o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>ii&nbsp; =
grub-xen-bin&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
2.02~beta3-5+deb9u1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; amd64&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; GRand =
Unified Bootloader, version 2 (Xen binaries)<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>ii&nbsp; =
grub-xen-host&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
2.02~beta3-5+deb9u1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; amd64&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; GRand =
Unified Bootloader, version 2 (Xen host version)<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>ii&nbsp; =
ipxe-qemu&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;1.0.0+git-20161027.b991c67-1&nbsp;&nbsp; =
all&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; PXE boot =
firmware - ROM images for qemu<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>ii&nbsp; =
qemu-system-common&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
1:2.8+dfsg-6+deb9u5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; amd64&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; QEMU full =
system emulation binaries (common files)<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>ii&nbsp; =
qemu-utils&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1:2.8+dfsg-6+deb9u5&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
amd64&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; QEMU =
utilities<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>ii&nbsp; =
xen-upstream&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
4.11.1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp; amd64&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Xen upstream =
testing build snapshot<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><div><di=
v style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span lang=3DNL>Van:</span></b><span =
lang=3DNL> Mark Pryor &lt;<a =
href=3D"mailto:tlviewer@yahoo.com">tlviewer@yahoo.com</a>&gt; =
<br><b>Verzonden:</b> Sunday, 23 December 2018 22:38<br><b>Aan:</b> <a =
href=3D"mailto:xen-users@lists.xenproject.org">xen-users@lists.xenproject=
.org</a>; <a =
href=3D"mailto:frm@gordijn.org">frm@gordijn.org</a><br><b>Onderwerp:</b> =
Re: [Xen-users] Xen performance on guest with LV/SSD very =
low.<o:p></o:p></span></p></div></div><p class=3DMsoNormal><span =
lang=3Den-NL><o:p>&nbsp;</o:p></span></p><div><div><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica Neue"'>It appears you =
are on Stretch with a self-built xen-4.11.<o:p></o:p></span></p><div><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica Neue"'>Can you clarify =
if you have used `make debball` and installed from a =
*.deb?<o:p></o:p></span></p><div><p class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue"'><o:p>&nbsp;</o:p></span></p><div><p class=3DMsoNormal><span =
lang=3Den-NL style=3D'font-size:10.0pt;font-family:"Helvetica Neue"'>and =
check that no remnants of a distro install are still =
present:<br>&gt;dpkg -l | grep -P '^ii|^hi' | grep -P =
'qemu|xen'<o:p></o:p></span></p></div></div></div></div><div><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue"'><o:p>&nbsp;</o:p></span></p><div><p class=3DMsoNormal><span =
lang=3Den-NL style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue"'>thanks,<o:p></o:p></span></p><div><p class=3DMsoNormal><span =
lang=3Den-NL style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue"'>PryMar56<br>##xen-packaging on Freenode =
IRC<o:p></o:p></span></p></div></div></div><div><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue"'><o:p>&nbsp;</o:p></span></p></div></div><div =
id=3D"yahoo_quoted_5651228723"><div><div><p class=3DMsoNormal><span =
lang=3Den-NL style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>On Sunday, December 23, 2018, 12:09:55 PM PST, =
&lt;<a href=3D"mailto:frm@gordijn.org">frm@gordijn.org</a>&gt; wrote: =
<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'><o:p>&nbsp;</o:p></span></p></div><div><div><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>Hi,<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>The past few days, I have scratched my head =
regarding very disk IO<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>performance on =
Xen.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3Den-NL style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>I have installed KVM on the same machine, same =
result: very low disk IO.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>With iozone on Dom0 I easily 180 MB/s, in a pv =
guest only 2MB/s. The Dom0 is<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica Neue";color:#26282A'>90 =
times faster.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3Den-NL style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>I tried many things, but I can not find the =
solution:<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3Den-NL style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica Neue";color:#26282A'>OS =
dom0: 4.18.0-0.bpo.1-amd64<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>Xen: 4.11.1<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>Command line: loglvl=3Dall dom0_mem=3D2048M =
dom0_max_vcpus=3D2 dom0_vcpus_pin<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>iommu=3D1 ucode=3Dscan =
gnttab_max_frames=3D256<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>Guest:<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>OS: =
4.18.0-0.bpo.1-amd64<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>lsmod | grep blk<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>xen_blkfront&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
40960&nbsp; 1<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3Den-NL style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>What am Ii missing =
here?<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3Den-NL style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>Thanks,<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica Neue";color:#26282A'>-- =
Jaap<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3Den-NL style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>_______________________________________________<o:p>=
</o:p></span></p></div><div><p class=3DMsoNormal><span lang=3Den-NL =
style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'>Xen-users mailing =
list<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3Den-NL style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'><a =
href=3D"mailto:Xen-users@lists.xenproject.org">Xen-users@lists.xenproject=
.org</a><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3Den-NL style=3D'font-size:10.0pt;font-family:"Helvetica =
Neue";color:#26282A'><a =
href=3D"https://lists.xenproject.org/mailman/listinfo/xen-users" =
target=3D"_blank">https://lists.xenproject.org/mailman/listinfo/xen-users=
</a><o:p></o:p></span></p></div></div></div></div></div></body></html>
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Subject: [Xen-users] Can't get xenconsole to work -- hangs with no output
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Xen version 4.6.5, running on Ubuntu 16.04.5 LTS.

I can't connect to the console of a domU.  I have tried *xl console
domu-name*, but it just hangs with no output, and I need to open a
separate *ssh* session to the dom0 and do a *kill -1* of the
*xenconsole* process.

The exact same thing happens if I do *xl console -c domu-config-file*.

In case it matters, the domU is running Ubuntu 16.04.4.

I'm obviously doing something wrong, but I can't find whatever how-to
document might exist to explain exactly how I'm supposed to configure
everything so the console will work.  Any help will be gratefully
appreciated.
-- 
*Rich Wales*
richw@richw.org

--------------73735452CC59BDD13A53CF46
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<html>
  <head>

    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  </head>
  <body text="#000000" bgcolor="#FFFFFF">
    Xen version 4.6.5, running on Ubuntu 16.04.5 LTS.<br>
    <br>
    I can't connect to the console of a domU.  I have tried <b>xl
      console domu-name</b>, but it just hangs with no output, and I
    need to open a separate <b>ssh</b> session to the dom0 and do a <b>kill
      -1</b> of the <b>xenconsole</b> process.<br>
    <br>
    The exact same thing happens if I do <b>xl console -c
      domu-config-file</b>.<br>
    <br>
    In case it matters, the domU is running Ubuntu 16.04.4.<br>
    <br>
    I'm obviously doing something wrong, but I can't find whatever
    how-to document might exist to explain exactly how I'm supposed to
    configure everything so the console will work.  Any help will be
    gratefully appreciated.<br>
    <div class="moz-signature"><span style="color:#FFFFFF">-- </span><br>
      <span style="color:#800000"><b>Rich Wales</b></span><br>
      <span style="color:#000000"><a class="moz-txt-link-abbreviated" href="mailto:richw@richw.org">richw@richw.org</a></span>
    </div>
  </body>
</html>

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From: Tomas Mozes <hydrapolic@gmail.com>
Date: Thu, 27 Dec 2018 11:36:23 +0100
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To: Rich Wales <richw@richw.org>
Subject: Re: [Xen-users] Can't get xenconsole to work -- hangs with no output
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https://wiki.xen.org/wiki/Xen_Common_Problems#Console

On Thursday, December 27, 2018, Rich Wales <richw@richw.org> wrote:
> Xen version 4.6.5, running on Ubuntu 16.04.5 LTS.
>
> I can't connect to the console of a domU.  I have tried xl console
domu-name, but it just hangs with no output, and I need to open a separate
ssh session to the dom0 and do a kill -1 of the xenconsole process.
>
> The exact same thing happens if I do xl console -c domu-config-file.
>
> In case it matters, the domU is running Ubuntu 16.04.4.
>
> I'm obviously doing something wrong, but I can't find whatever how-to
document might exist to explain exactly how I'm supposed to configure
everything so the console will work.  Any help will be gratefully
appreciated.
> --
> Rich Wales
> richw@richw.org

--000000000000a9944a057dfe8443
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<a href=3D"https://wiki.xen.org/wiki/Xen_Common_Problems#Console">https://w=
iki.xen.org/wiki/Xen_Common_Problems#Console</a><br><br>On Thursday, Decemb=
er 27, 2018, Rich Wales &lt;<a href=3D"mailto:richw@richw.org">richw@richw.=
org</a>&gt; wrote:<br>&gt; Xen version 4.6.5, running on Ubuntu 16.04.5 LTS=
.<br>&gt;<br>&gt; I can&#39;t connect to the console of a domU.=C2=A0 I hav=
e tried xl console domu-name, but it just hangs with no output, and I need =
to open a separate ssh session to the dom0 and do a kill -1 of the xenconso=
le process.<br>&gt;<br>&gt; The exact same thing happens if I do xl console=
 -c domu-config-file.<br>&gt;<br>&gt; In case it matters, the domU is runni=
ng Ubuntu 16.04.4.<br>&gt;<br>&gt; I&#39;m obviously doing something wrong,=
 but I can&#39;t find whatever how-to document might exist to explain exact=
ly how I&#39;m supposed to configure everything so the console will work.=
=C2=A0 Any help will be gratefully appreciated.<br>&gt; --<br>&gt; Rich Wal=
es<br>&gt; <a href=3D"mailto:richw@richw.org">richw@richw.org</a>

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Subject: [Xen-users] CORRECTION: Can't get xenconsole to work -- hangs with
 no output
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> /The exact same thing happens if I do //*xl console -c
> domu-config-file*//./

I meant, of course, *xl _create_ -c domu-config-file* in the above. 
Sorry for the mixup.

> /In case it matters, the domU is running Ubuntu 16.04.4./

And I also couldn't connect to the console when running the Ubuntu 18.04
installation ISO image.  So I'm tentatively guessing the problem has
nothing to do with Grub options in the guest OS.
-- 
*Rich Wales*
richw@richw.org

--------------799A20B8A3D65791DEE68754
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    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  </head>
  <body text="#000000" bgcolor="#FFFFFF">
    <br>
    <blockquote type="cite"
      cite="mid:43QLlQ5jYqz8066@memoryalpha.richw.org"><font
        color="#3333ff"><i> The exact same thing happens if I do </i><i><b>xl
            console -c domu-config-file</b></i><i>.</i></font><br>
    </blockquote>
    <br>
    I meant, of course, <b>xl <u>create</u> -c domu-config-file</b> in
    the above.  Sorry for the mixup.<br>
    <br>
    <blockquote type="cite"
      cite="mid:43QLlQ5jYqz8066@memoryalpha.richw.org"><font
        color="#3333ff"><i> In case it matters, the domU is running
          Ubuntu 16.04.4.</i></font><br>
    </blockquote>
    <br>
    And I also couldn't connect to the console when running the Ubuntu
    18.04 installation ISO image.  So I'm tentatively guessing the
    problem has nothing to do with Grub options in the guest OS.<br>
    <div class="moz-signature"><span style="color:#FFFFFF">-- </span><br>
      <span style="color:#800000"><b>Rich Wales</b></span><br>
      <span style="color:#000000"><a class="moz-txt-link-abbreviated" href="mailto:richw@richw.org">richw@richw.org</a></span>
    </div>
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Subject: Re: [Xen-users] Can't get xenconsole to work -- hangs with no output
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On 2018-12-27 02:36, Tomas Mozes wrote:  
https://wiki.xen.org/wiki/Xen_Common_Problems#Console

No luck.  *Xenconsoled* was running on the dom0; I killed it, but I
couldn't find any "official" way of restarting it, so I just typed the
*xenconsoled* command which had been running before I killed it.

I did an *xl create -c* command for the domU, and the domU started up,
but the console never appeared (even though there was a
*/usr/lib/xen-4.6/bin/xenconsole* process running), and I had to kill
the *xenconsole* process from a different terminal.

I'm not trying to launch more than one console session on this domU; I'm
only trying to launch one, and it won't even let me do that.

In case it matters any, I'm connecting to the dom0 from a separate
workstation, by launching a *gnome-terminal* window with an *ssh*
command as its *-x* argument.  I have *ForwardX11 yes* in my
*.ssh/config* file for the dom0 server.  Do I, perhaps, need to do
something different, or something more, in order for the console window
to show up on my workstation?

I would like to avoid rebooting the dom0 server if at all possible, but
I'm prepared to do that if necessary, since I absolutely must have
access to a console on the domU in order to do anything at all.
-- 
*Rich Wales*
richw@richw.org

--------------92B9F0C3FFBD6B93B475C31B
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<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  </head>
  <body text="#000000" bgcolor="#FFFFFF">
    On 2018-12-27 02:36, Tomas Mozes wrote:   <a
      href="https://wiki.xen.org/wiki/Xen_Common_Problems#Console"
      moz-do-not-send="true">https://wiki.xen.org/wiki/Xen_Common_Problems#Console</a><br>
    <br>
    No luck.  <b>Xenconsoled</b> was running on the dom0; I killed it,
    but I couldn't find any "official" way of restarting it, so I just
    typed the <b>xenconsoled</b> command which had been running before
    I killed it.<br>
    <br>
    I did an <b>xl create -c</b> command for the domU, and the domU
    started up, but the console never appeared (even though there was a
    <b>/usr/lib/xen-4.6/bin/xenconsole</b> process running), and I had
    to kill the <b>xenconsole</b> process from a different terminal.<br>
    <br>
    I'm not trying to launch more than one console session on this domU;
    I'm only trying to launch one, and it won't even let me do that.<br>
    <br>
    In case it matters any, I'm connecting to the dom0 from a separate
    workstation, by launching a <b>gnome-terminal</b> window with an <b>ssh</b>
    command as its <b>-x</b> argument.  I have <b>ForwardX11 yes</b>
    in my <b>.ssh/config</b> file for the dom0 server.  Do I, perhaps,
    need to do something different, or something more, in order for the
    console window to show up on my workstation?<br>
    <br>
    I would like to avoid rebooting the dom0 server if at all possible,
    but I'm prepared to do that if necessary, since I absolutely must
    have access to a console on the domU in order to do anything at all.<br>
    <div class="moz-signature"><span style="color:#FFFFFF">-- </span><br>
      <span style="color:#800000"><b>Rich Wales</b></span><br>
      <span style="color:#000000"><a class="moz-txt-link-abbreviated" href="mailto:richw@richw.org">richw@richw.org</a></span>
    </div>
  </body>
</html>

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From: Tomas Mozes <hydrapolic@gmail.com>
Date: Fri, 28 Dec 2018 02:41:32 +0100
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To: Rich Wales <richw@richw.org>
Subject: Re: [Xen-users] Can't get xenconsole to work -- hangs with no output
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Can you please share your domu-config?

On Thursday, December 27, 2018, Rich Wales <richw@richw.org> wrote:
> On 2018-12-27 02:36, Tomas Mozes wrote:
https://wiki.xen.org/wiki/Xen_Common_Problems#Console
>
> No luck.  Xenconsoled was running on the dom0; I killed it, but I
couldn't find any "official" way of restarting it, so I just typed the
xenconsoled command which had been running before I killed it.
>
> I did an xl create -c command for the domU, and the domU started up, but
the console never appeared (even though there was a
/usr/lib/xen-4.6/bin/xenconsole process running), and I had to kill the
xenconsole process from a different terminal.
>
> I'm not trying to launch more than one console session on this domU; I'm
only trying to launch one, and it won't even let me do that.
>
> In case it matters any, I'm connecting to the dom0 from a separate
workstation, by launching a gnome-terminal window with an ssh command as
its -x argument.  I have ForwardX11 yes in my .ssh/config file for the dom0
server.  Do I, perhaps, need to do something different, or something more,
in order for the console window to show up on my workstation?
>
> I would like to avoid rebooting the dom0 server if at all possible, but
I'm prepared to do that if necessary, since I absolutely must have access
to a console on the domU in order to do anything at all.
> --
> Rich Wales
> richw@richw.org

--000000000000ba8f44057e0b2993
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Can you please share your domu-config? <br><br>On Thursday, December 27, 20=
18, Rich Wales &lt;<a href=3D"mailto:richw@richw.org">richw@richw.org</a>&g=
t; wrote:<br>&gt; On 2018-12-27 02:36, Tomas Mozes wrote:=C2=A0=C2=A0 <a hr=
ef=3D"https://wiki.xen.org/wiki/Xen_Common_Problems#Console">https://wiki.x=
en.org/wiki/Xen_Common_Problems#Console</a><br>&gt;<br>&gt; No luck.=C2=A0 =
Xenconsoled was running on the dom0; I killed it, but I couldn&#39;t find a=
ny &quot;official&quot; way of restarting it, so I just typed the xenconsol=
ed command which had been running before I killed it.<br>&gt;<br>&gt; I did=
 an xl create -c command for the domU, and the domU started up, but the con=
sole never appeared (even though there was a /usr/lib/xen-4.6/bin/xenconsol=
e process running), and I had to kill the xenconsole process from a differe=
nt terminal.<br>&gt;<br>&gt; I&#39;m not trying to launch more than one con=
sole session on this domU; I&#39;m only trying to launch one, and it won&#3=
9;t even let me do that.<br>&gt;<br>&gt; In case it matters any, I&#39;m co=
nnecting to the dom0 from a separate workstation, by launching a gnome-term=
inal window with an ssh command as its -x argument.=C2=A0 I have ForwardX11=
 yes in my .ssh/config file for the dom0 server.=C2=A0 Do I, perhaps, need =
to do something different, or something more, in order for the console wind=
ow to show up on my workstation?<br>&gt;<br>&gt; I would like to avoid rebo=
oting the dom0 server if at all possible, but I&#39;m prepared to do that i=
f necessary, since I absolutely must have access to a console on the domU i=
n order to do anything at all.<br>&gt; --<br>&gt; Rich Wales<br>&gt; <a hre=
f=3D"mailto:richw@richw.org">richw@richw.org</a>

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Subject: Re: [Xen-users] Can't get xenconsole to work -- hangs with no output
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> // /Can you please share your domu-config? /

name = "shield"
builder = "hvm"
memory = 4096
vcpus = 2
device_model_version = "qemu-xen"
serial = "pty"
acpi = 1
vnc = 1
vif  = ['ip=10.0.223.149/32,mac=00:16:3e:ff:df:95,bridge=xenbr0',
        'mac=00:16:3e:fe:47:0a,bridge=xenbr1'
       ]
disk = [
        'file:/etc/xen/ubuntu-18.04.1-server-amd64.iso,sdc:cdrom,r',
        'phy:/dev/md1,xvda,w'
       ]
-- 
*Rich Wales*
richw@richw.org

--------------41C751E3B9F1ADF695AE5DFA
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<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  </head>
  <body text="#000000" bgcolor="#FFFFFF">
    <br>
    <blockquote type="cite"
cite="mid:CAG6MAzTn2Co_J11dNV4xGDGQBfNZfybnGP=GX-rhG23xRYv1XA@mail.gmail.com"><font
        color="#3333ff"><i>
        </i></font>
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      <font color="#3333ff"><i>Can you please share your domu-config? </i></font><br>
    </blockquote>
    <br>
    <tt>name = "shield"</tt><tt><br>
    </tt><tt>builder = "hvm"</tt><tt><br>
    </tt><tt>memory = 4096</tt><tt><br>
    </tt><tt>vcpus = 2</tt><tt><br>
    </tt><tt>device_model_version = "qemu-xen"</tt><tt><br>
    </tt><tt>serial = "pty"</tt><tt><br>
    </tt><tt>acpi = 1</tt><tt><br>
    </tt><tt>vnc = 1</tt><tt><br>
    </tt><tt>vif  =
      ['ip=10.0.223.149/32,mac=00:16:3e:ff:df:95,bridge=xenbr0',</tt><tt><br>
    </tt><tt>        'mac=00:16:3e:fe:47:0a,bridge=xenbr1'</tt><tt><br>
    </tt><tt>       ]</tt><tt><br>
    </tt><tt>disk = [</tt><tt><br>
    </tt><tt>       
      '<a class="moz-txt-link-freetext" href="file:/etc/xen/ubuntu-18.04.1-server-amd64.iso,sdc:cdrom,r">file:/etc/xen/ubuntu-18.04.1-server-amd64.iso,sdc:cdrom,r</a>',</tt><tt><br>
    </tt><tt>        'phy:/dev/md1,xvda,w'</tt><tt><br>
    </tt><tt>       ]</tt><br>
    <div class="moz-signature"><span style="color:#FFFFFF">-- </span><br>
      <span style="color:#800000"><b>Rich Wales</b></span><br>
      <span style="color:#000000"><a class="moz-txt-link-abbreviated" href="mailto:richw@richw.org">richw@richw.org</a></span>
    </div>
  </body>
</html>

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Subject: Re: [Xen-users] Can't get xenconsole to work -- hangs with no output
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Subject: Re: [Xen-users] Can't get xenconsole to work -- hangs with no output
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On 2018-12-27 18:37, Andy Smith wrote:

> /what you have is a HVM guest so the console inside the guest is
> ttyS0. Unless your guest has been configured to log to ttyS0 and
> present a login prompt on ttyS0, you aren't going to see anything or
> get any response when you type things./

But I have no control over how the guest is configured, because I am
running an Ubuntu installation CD-ROM image (which I cannot change in
any way).  What do I need to use in my domU configuration file in order
for me to be able to interact with the console?
-- 
*Rich Wales*
richw@richw.org

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    On 2018-12-27 18:37, Andy Smith wrote:<br>
    <br>
    <blockquote type="cite" cite="mid:20181228023742.GM4569@bitfolk.com"><font
        color="#3333ff"><i>what you have is a HVM guest so the console
          inside the guest is ttyS0. Unless your guest has been
          configured to log to ttyS0 and present a login prompt on
          ttyS0, you aren't going to see anything or get any response
          when you type things.</i></font></blockquote>
    <br>
    But I have no control over how the guest is configured, because I am
    running an Ubuntu installation CD-ROM image (which I cannot change
    in any way).  What do I need to use in my domU configuration file in
    order for me to be able to interact with the console?<br>
    <div class="moz-signature"><span style="color:#FFFFFF">-- </span><br>
      <span style="color:#800000"><b>Rich Wales</b></span><br>
      <span style="color:#000000"><a class="moz-txt-link-abbreviated" href="mailto:richw@richw.org">richw@richw.org</a></span>
    </div>
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From: Tomas Mozes <hydrapolic@gmail.com>
Date: Fri, 28 Dec 2018 05:11:27 +0100
Message-ID: <CAG6MAzR61dJ-puRm+EUc6kgiZ38nY79PLzMmS4mRUZ1h8wHaQw@mail.gmail.com>
To: Rich Wales <richw@richw.org>
Subject: Re: [Xen-users] Can't get xenconsole to work -- hangs with no output
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How about using VNC?

On Fri, Dec 28, 2018 at 4:15 AM Rich Wales <richw@richw.org> wrote:

> On 2018-12-27 18:37, Andy Smith wrote:
>
> *what you have is a HVM guest so the console inside the guest is ttyS0.
> Unless your guest has been configured to log to ttyS0 and present a login
> prompt on ttyS0, you aren't going to see anything or get any response when
> you type things.*
>
>
> But I have no control over how the guest is configured, because I am
> running an Ubuntu installation CD-ROM image (which I cannot change in any
> way).  What do I need to use in my domU configuration file in order for me
> to be able to interact with the console?
> --
> *Rich Wales*
> richw@richw.org
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xenproject.org
> https://lists.xenproject.org/mailman/listinfo/xen-users

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<div dir=3D"ltr"><div>How about using VNC?</div></div><br><div class=3D"gma=
il_quote"><div dir=3D"ltr">On Fri, Dec 28, 2018 at 4:15 AM Rich Wales &lt;<=
a href=3D"mailto:richw@richw.org">richw@richw.org</a>&gt; wrote:<br></div><=
blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l=
eft:1px solid rgb(204,204,204);padding-left:1ex">
 =20
   =20
 =20
  <div bgcolor=3D"#FFFFFF">
    On 2018-12-27 18:37, Andy Smith wrote:<br>
    <br>
    <blockquote type=3D"cite"><font color=3D"#3333ff"><i>what you have is a=
 HVM guest so the console
          inside the guest is ttyS0. Unless your guest has been
          configured to log to ttyS0 and present a login prompt on
          ttyS0, you aren&#39;t going to see anything or get any response
          when you type things.</i></font></blockquote>
    <br>
    But I have no control over how the guest is configured, because I am
    running an Ubuntu installation CD-ROM image (which I cannot change
    in any way).=C2=A0 What do I need to use in my domU configuration file =
in
    order for me to be able to interact with the console?<br>
    <div class=3D"gmail-m_1885249026636804384moz-signature"><span style=3D"=
color:rgb(255,255,255)">-- </span><br>
      <span style=3D"color:rgb(128,0,0)"><b>Rich Wales</b></span><br>
      <span style=3D"color:rgb(0,0,0)"><a class=3D"gmail-m_1885249026636804=
384moz-txt-link-abbreviated" href=3D"mailto:richw@richw.org" target=3D"_bla=
nk">richw@richw.org</a></span>
    </div>
  </div>

_______________________________________________<br>
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rs@lists.xenproject.org</a><br>
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noreferrer" target=3D"_blank">https://lists.xenproject.org/mailman/listinfo=
/xen-users</a></blockquote></div>

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Subject: Re: [Xen-users] Can't get xenconsole to work -- hangs with no output
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> /How about using VNC?/

More details, please?  I tried using *vncviewer* to connect to the domU,
but I couldn't get it to work.  Perhaps I messed up the command syntax
and/or the domU configuration.  Or is it possible that I've got
something messed up with X11 forwarding between the dom0 and my workstation?
-- 
*Rich Wales*
richw@richw.org

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    <br>
    <blockquote type="cite"
cite="mid:CAG6MAzR61dJ-puRm+EUc6kgiZ38nY79PLzMmS4mRUZ1h8wHaQw@mail.gmail.com">
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      <div dir="ltr">
        <div><font color="#3333ff"><i>How about using VNC?</i></font></div>
      </div>
    </blockquote>
    <br>
    More details, please?  I tried using <b>vncviewer</b> to connect to
    the domU, but I couldn't get it to work.  Perhaps I messed up the
    command syntax and/or the domU configuration.  Or is it possible
    that I've got something messed up with X11 forwarding between the
    dom0 and my workstation?<br>
    <div class="moz-signature"><span style="color:#FFFFFF">-- </span><br>
      <span style="color:#800000"><b>Rich Wales</b></span><br>
      <span style="color:#000000"><a class="moz-txt-link-abbreviated" href="mailto:richw@richw.org">richw@richw.org</a></span>
    </div>
  </body>
</html>

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From: Tomas Mozes <hydrapolic@gmail.com>
Date: Fri, 28 Dec 2018 08:09:48 +0100
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To: Rich Wales <richw@richw.org>
Subject: Re: [Xen-users] Can't get xenconsole to work -- hangs with no output
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Since you have vnc enabled in your domu config, you should see an open port
(probably 5900) on dom0 by which you'll see the domu screen.

On Friday, December 28, 2018, Rich Wales <richw@richw.org> wrote:
>
> How about using VNC?
>
> More details, please?  I tried using vncviewer to connect to the domU,
but I couldn't get it to work.  Perhaps I messed up the command syntax
and/or the domU configuration.  Or is it possible that I've got something
messed up with X11 forwarding between the dom0 and my workstation?
> --
> Rich Wales
> richw@richw.org

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Since you have vnc enabled in your domu config, you should see an open port=
 (probably 5900) on dom0 by which you&#39;ll see the domu screen. <br><br>O=
n Friday, December 28, 2018, Rich Wales &lt;<a href=3D"mailto:richw@richw.o=
rg">richw@richw.org</a>&gt; wrote:<br>&gt;<br>&gt; How about using VNC?<br>=
&gt;<br>&gt; More details, please?=C2=A0 I tried using vncviewer to connect=
 to the domU, but I couldn&#39;t get it to work.=C2=A0 Perhaps I messed up =
the command syntax and/or the domU configuration.=C2=A0 Or is it possible t=
hat I&#39;ve got something messed up with X11 forwarding between the dom0 a=
nd my workstation?<br>&gt; --<br>&gt; Rich Wales<br>&gt; <a href=3D"mailto:=
richw@richw.org">richw@richw.org</a>

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Subject: Re: [Xen-users] Can't get xenconsole to work -- hangs with no output
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On 2018-12-27 23:09, Tomas Mozes wrote:
> // /Since you have vnc enabled in your domu config, you should see an
> open port (probably 5900) on dom0 by which you'll see the domu screen. /

Indeed, I do see port 5900 open on the dom0.  But when I try
*vncviewer*, it gives me "Can't open display" errors.

If I do telnet localhost 5900 on the dom0, I get a one-line response
saying *RFB 003.008* -- but it doesn't respond to anything I type after
that, and it eventually disconnects.

As I said earlier, I suppose I might not have X11 forwarding set up
properly between the dom0 and my workstation.  I do have *ForwardX11
yes* specified in the *.ssh/config* stanza on my workstation for
connecting to the dom0.  But I'm wondering if I need to do something
more and/or something different w/r/t the X11 forwarding and/or the
*vncviewer* command.  Any suggestions?
-- 
*Rich Wales*
richw@richw.org

--------------43FCEFE5640C3AAAE651A00A
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<html>
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    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  </head>
  <body text="#000000" bgcolor="#FFFFFF">
    On 2018-12-27 23:09, Tomas Mozes wrote:<br>
    <blockquote type="cite"
cite="mid:CAG6MAzQFKE_d6+FRuChJ2NW_6RfXF-crGRyWwOhQX-DsH4FVqQ@mail.gmail.com"><font
        color="#3333ff"><i>
        </i></font>
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      <font color="#3333ff"><i>Since you have vnc enabled in your domu
          config, you should see an open port (probably 5900) on dom0 by
          which you'll see the domu screen. </i></font><br>
    </blockquote>
    <br>
    Indeed, I do see port 5900 open on the dom0.  But when I try <b>vncviewer</b>,
    it gives me "Can't open display" errors.<br>
    <br>
    If I do telnet localhost 5900 on the dom0, I get a one-line response
    saying <b>RFB 003.008</b> -- but it doesn't respond to anything I
    type after that, and it eventually disconnects.<br>
    <br>
    As I said earlier, I suppose I might not have X11 forwarding set up
    properly between the dom0 and my workstation.  I do have <b>ForwardX11
      yes</b> specified in the <b>.ssh/config</b> stanza on my
    workstation for connecting to the dom0.  But I'm wondering if I need
    to do something more and/or something different w/r/t the X11
    forwarding and/or the <b>vncviewer</b> command.  Any suggestions?<br>
    <div class="moz-signature"><span style="color:#FFFFFF">-- </span><br>
      <span style="color:#800000"><b>Rich Wales</b></span><br>
      <span style="color:#000000"><a class="moz-txt-link-abbreviated" href="mailto:richw@richw.org">richw@richw.org</a></span>
    </div>
  </body>
</html>

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Subject: [Xen-users] SOLVED: Re: Can't get xenconsole to work -- hangs with
 no output
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In the end, it turned out to be an SSH configuration problem, and not a
problem with Xen after all.

I added the following new line to */etc/ssh/sshd_config* on the dom0 server:
*X11UseLocalhost no*
(then restarted the SSH service on the dom0, of course)

After doing this and *ssh*'ing to the dom0, I did *vncviewer localhost*
on the dom0 and got a console window for the domU on my workstation!

*xl console* still doesn't work, but that's OK, because I can use
*vncviewer* now.

I found this solution on the *AskUbuntu* site:
https://askubuntu.com/questions/958470/how-to-open-mono-app-with-gui-in-linux-server-without-x

Thanks to Tomas Mozes and Andy Smith for their assistance with my problem.
-- 
*Rich Wales*
richw@richw.org

--------------9827961F9F2384C269F57DE0
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<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  </head>
  <body text="#000000" bgcolor="#FFFFFF">
    In the end, it turned out to be an SSH configuration problem, and
    not a problem with Xen after all.<br>
    <br>
    I added the following new line to <b>/etc/ssh/sshd_config</b> on
    the dom0 server:<br>
    <b><tt>X11UseLocalhost no</tt></b><br>
    (then restarted the SSH service on the dom0, of course)<br>
    <br>
    After doing this and <b>ssh</b>'ing to the dom0, I did <b>vncviewer
      localhost</b> on the dom0 and got a console window for the domU on
    my workstation!<br>
    <br>
    <b>xl console</b> still doesn't work, but that's OK, because I can
    use <b>vncviewer</b> now.<br>
    <br>
    I found this solution on the <b>AskUbuntu</b> site:<br>
<a class="moz-txt-link-freetext" href="https://askubuntu.com/questions/958470/how-to-open-mono-app-with-gui-in-linux-server-without-x">https://askubuntu.com/questions/958470/how-to-open-mono-app-with-gui-in-linux-server-without-x</a><br>
    <br>
    Thanks to Tomas Mozes and Andy Smith for their assistance with my
    problem.<br>
    <div class="moz-signature"><span style="color:#FFFFFF">-- </span><br>
      <span style="color:#800000"><b>Rich Wales</b></span><br>
      <span style="color:#000000"><a class="moz-txt-link-abbreviated" href="mailto:richw@richw.org">richw@richw.org</a></span>
    </div>
  </body>
</html>

--------------9827961F9F2384C269F57DE0--


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From: Tomas Mozes <hydrapolic@gmail.com>
Date: Sat, 29 Dec 2018 15:34:27 +0100
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To: Rich Wales <richw@richw.org>
Subject: Re: [Xen-users] SOLVED: Re: Can't get xenconsole to work -- hangs
 with no output
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Glad it works for you now :)

On Friday, December 28, 2018, Rich Wales <richw@richw.org> wrote:
> In the end, it turned out to be an SSH configuration problem, and not a
problem with Xen after all.
>
> I added the following new line to /etc/ssh/sshd_config on the dom0 server:
> X11UseLocalhost no
> (then restarted the SSH service on the dom0, of course)
>
> After doing this and ssh'ing to the dom0, I did vncviewer localhost on
the dom0 and got a console window for the domU on my workstation!
>
> xl console still doesn't work, but that's OK, because I can use vncviewer
now.
>
> I found this solution on the AskUbuntu site:
>
https://askubuntu.com/questions/958470/how-to-open-mono-app-with-gui-in-linux-server-without-x
>
> Thanks to Tomas Mozes and Andy Smith for their assistance with my problem.
> --
> Rich Wales
> richw@richw.org

--000000000000b8b7b6057e2a13ed
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Glad it works for you now :) <br><br>On Friday, December 28, 2018, Rich Wal=
es &lt;<a href=3D"mailto:richw@richw.org">richw@richw.org</a>&gt; wrote:<br=
>&gt; In the end, it turned out to be an SSH configuration problem, and not=
 a problem with Xen after all.<br>&gt;<br>&gt; I added the following new li=
ne to /etc/ssh/sshd_config on the dom0 server:<br>&gt; X11UseLocalhost no<b=
r>&gt; (then restarted the SSH service on the dom0, of course)<br>&gt;<br>&=
gt; After doing this and ssh&#39;ing to the dom0, I did vncviewer localhost=
 on the dom0 and got a console window for the domU on my workstation!<br>&g=
t;<br>&gt; xl console still doesn&#39;t work, but that&#39;s OK, because I =
can use vncviewer now.<br>&gt;<br>&gt; I found this solution on the AskUbun=
tu site:<br>&gt; <a href=3D"https://askubuntu.com/questions/958470/how-to-o=
pen-mono-app-with-gui-in-linux-server-without-x">https://askubuntu.com/ques=
tions/958470/how-to-open-mono-app-with-gui-in-linux-server-without-x</a><br=
>&gt;<br>&gt; Thanks to Tomas Mozes and Andy Smith for their assistance wit=
h my problem.<br>&gt; --<br>&gt; Rich Wales<br>&gt; <a href=3D"mailto:richw=
@richw.org">richw@richw.org</a>

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