RE: [Xen-users] xen 4.1 missing memory

["Ian Tobin" <itobin@xxxxxxxxxxxxx>]

Hi,

I will try and do this over the weekend.  It looks to me like another
bug and the configs are just getting ignored.

So far I have

DomUs do not shutdown when shutting down the server, they just
terminate.
DomUs do not auto startup when powering on server
VNC has to be set in DomU config to except from 0.0.0.0 even though it
is set in xend-config.sxp
And now memory usage is being eaten

All the above are set in /etc/rc"*.d scripts and in /etc/xen/auto

Xen 4.1 on debian 6 is very buggy at the minute but 4.0.1 on debian 5
worked like a charm.

Thanks

Ian


-----Original Message-----
From: Yi, Shunli [mailto:syi@xxxxxxxxxxxx] 
Sent: 18 August 2011 09:52
To: Ian Tobin
Subject: RE: [Xen-users] xen 4.1 missing memory

Yes, your config is right for Xen-4.1.1.  I have no idea yet.  

Here is a suggestion for trouble-shooting.
1. Do not start the xendomains service automatically,( by "chkconfig
xendomains off") 2. restart your box, and check the memory of Domain0. (
no domainU has been started at that time ) 3. start the domainUs by
manually, one by one. To check the memory changes after every DomU
starting.

By the way, please do check the kernel parameters didn't limit the
memory size in grub.conf. 

-Shunli


-----Original Message-----
From: Ian Tobin [mailto:itobin@xxxxxxxxxxxxx]
Sent: Thursday, August 18, 2011 3:30 PM
To: Yi, Shunli; Fajar A. Nugraha
Cc: Xen User-List
Subject: RE: [Xen-users] xen 4.1 missing memory

My config is a little different, here is what is currently set:-

# dom0-min-mem is the lowest permissible memory level (in MB) for dom0.
# This is a minimum both for auto-ballooning (as enabled by #
enable-dom0-ballooning below) and for xm mem-set when applied to dom0.
(dom0-min-mem 512)

# Whether to enable auto-ballooning of dom0 to allow domUs to be
created.
# If enable-dom0-ballooning = no, dom0 will never balloon out.
(enable-dom0-ballooning no)


Output of top

Cpu(s):  1.9%us,  5.8%sy,  0.0%ni, 91.5%id,  0.0%wa,  0.0%hi,  0.1%si,
0.7%st
Mem:    302000k total,   260088k used,    41912k free,     1020k buffers
Swap:  1501944k total,    41700k used,  1460244k free,    17460k cached



thanks




-----Original Message-----
From: Yi, Shunli [mailto:syi@xxxxxxxxxxxx]
Sent: 18 August 2011 08:14
To: Ian Tobin; Fajar A. Nugraha
Cc: Xen User-List
Subject: RE: [Xen-users] xen 4.1 missing memory

Seems there is still enough memory.
So, suggest to disable the balloon driver, and have a try.
In /etc/xen/xend-config.sxp:
# Dom0 will balloon out when needed to free memory for domU.
# dom0-min-mem is the lowest memory level (in MB) dom0 will get down to.
# If dom0-min-mem=0, dom0 will never balloon out.
(dom0-min-mem 256)

Try set (dom0-min-mem 0)  to disable the balloon function.

Temporarily, set the Domain0 memory by "xm set-mem 0 512" if  you don't
want a Domain0 reboot.

-Shunli

-----Original Message-----
From: Ian Tobin [mailto:itobin@xxxxxxxxxxxxx]
Sent: Thursday, August 18, 2011 3:01 PM
To: Yi, Shunli; Fajar A. Nugraha
Cc: Xen User-List
Subject: RE: [Xen-users] xen 4.1 missing memory

Sure, some bits changed for privacy reasons

xm root@myhost:~# xl info
host                   : myhost.domain.com
release                : 2.6.32.43
version                : #6 SMP Tue Jul 26 13:43:40 BST 2011
machine                : x86_64
nr_cpus                : 4
nr_nodes               : 1
cores_per_socket       : 4
threads_per_core       : 1
cpu_mhz                : 2800
hw_caps                :
178bf3ff:efd3fbff:00000000:00001310:00802001:00000000:000037ff:00000000
virt_caps              : hvm
total_memory           : 7935
free_memory            : 1195
free_cpus              : 0
xen_major              : 4
xen_minor              : 1
xen_extra              : .1
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32
hvm-3.0-x86_32p hvm-3.0-x86_64
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          : unavailable
xen_commandline        : placeholder dom0_mem=512Mcc_compiler
: gcc version 4.3.2 (Debian 4.3.2-1.1)
cc_compile_by          : root
cc_compile_domain      : domain.com
cc_compile_date        : Tue Jul 26 10:42:19 BST 2011
xend_config_format     : 4
root@myhost:~#


root@myhost:~# xl list
Name                                        ID   Mem VCPUs      State
Time(s)
Domain-0                                    0   294     4     r-----
1287.3
Domu1                                       1  1019     2     -b----
89.4
Domu2                                       2   251     2     -b----
226.4
Domu3                                       3   763     4     -b----
266.0
Domu4                                       4   507     2     -b----
80.4
Domu5                                       5  1019     2     -b----
65.1
Domu6                                       6   113     1     -b----
4.3
Domu7                                       7   507     2     -b----
96.0
Domu8                                       8    49     1     -b----
4.0
Domu9                                       9  1019     4     -b----
190.0
Domu10                                    10  1019     2     -b----
28.1
root@myhost:~#


thanks

-----Original Message-----
From: Yi, Shunli [mailto:syi@xxxxxxxxxxxx]
Sent: 18 August 2011 07:08
To: Ian Tobin; Fajar A. Nugraha
Cc: Xen User-List
Subject: RE: [Xen-users] xen 4.1 missing memory

Try to paste the output of "xm info" and "xm list".

-Shunli

-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Ian Tobin
Sent: Thursday, August 18, 2011 2:03 PM
To: Fajar A. Nugraha
Cc: Xen User-List
Subject: Re: [Xen-users] xen 4.1 missing memory

Hey,

I set the dom0 min men to 512m in xend-config.sxp and ballooning is
already enabled.  I rebooted and it initially shows 512m but one the vms
are booted it drops to 256 .

Any other thoughts?

Thanks

 




 


On 17 Aug 2011, at 10:44, "Fajar A. Nugraha" <list@xxxxxxxxx> wrote:

> On Wed, Aug 17, 2011 at 2:35 PM, Ian Tobin <itobin@xxxxxxxxxxxxx>
wrote:
>> Hi,
>> 
>> 
>> 
>> We have the dom0_mem=512M parameter set on boot which does show up 
>> after booting however ive noticed that it drops to roughly 256M on 
>> one of the boxes after the VMs are all started which is causing slow 
>> downs as it needs to swap.
> 
> IIRC that is expected behaviour, no matter what version the kernel is.
> 
>> The kernel is 2.6.32.43, has anyone else seen this?>
> dom0_mem only sets dom0's initial memory. If domU needs more memory,
> dom0 can still baloon down. See dom0-min-mem and 
> enable-dom0-ballooning on /etc/xen/xend-config.sxp to change this 
> behavior.
> 
> --
> Fajar
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
> 


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