Re: [Xen-users] PV networking issue in 2.6.38.6 and 2.6.39-rc7 pvops dom0 kernels

[Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>]

On Mon, 2011-05-16 at 09:56 +0100, Mario wrote:
> On 05/16/2011 09:58 AM, Ian Campbell wrote:
> > On Mon, 2011-05-16 at 07:51 +0100, Pasi KÃrkkÃinen wrote:
> >> Hello,
> >>
> >> Ian: Any idea what could cause this error message (more info below):
> >>
> >> "XENBUS: Timeout connecting to device: device/vif/0 (state 1)"
> >
> > Is this from the domU or the dom0?
> 
> This is from the domU.
> 
> >
> > Do other devices work ok?
> >
> 
> Yes, everything else seems to be working fine.
> 
> 
> >> User says replacing 2.6.38/2.6.39 pvops dom0 kernel with xenlinux one
> >> fixes the problem..
> >
> > 2.6.38 didn't have netback, only 2.6.39-rc1 did. Mario, please can you
> > supply the .config you used with the 2.6.39 kernel and the exact commit
> > id you are using. It would also be useful to see a complete log from
> > both dom0 and domU.
> >
> 
> Well, when i saw that 2.6.39-rc7 did not work, and i did not expect 
> anyone to care, i simply wiped all of the pvops stuff that i was 
> testing, and replaced it with a gentoo patched kernel wich works.
> If it will not be in vain, i will compile it again and give you more 
> details.

Yes please, we care very much about pvops to working well for everyone.
(I'm not sure why you would think otherwise, this has been the focus of
our development efforts for several years now).

Ian.

> 
> > Do the vif entries appear in XenStore? Using:
> >     xenstore-ls /local/domain/$(xl domid<name>)/devices/vif
> > you should see some entries and those entries should reference a backend
> > path which should also contains entries, please post both.
> >
> 
> Well, from what i remember, only vhd was being shown, but i will try and 
> get you exact info today.
> 
> 
> > Ian.
> >
> >>
> >> -- Pasi
> >>
> >> On Sun, May 15, 2011 at 07:24:54PM +0200, Mario wrote:
> >>>
> >>>
> >>> On 05/15/2011 07:20 PM, Pasi KÃrkkÃinen wrote:
> >>>> On Sun, May 15, 2011 at 08:03:45PM +0300, Pasi KÃrkkÃinen wrote:
> >>>>> On Sun, May 15, 2011 at 06:41:25PM +0200, Mario wrote:
> >>>>>> On 05/15/2011 06:34 PM, Pasi KÃrkkÃinen wrote:
> >>>>>>> On Sun, May 15, 2011 at 06:24:11PM +0200, Mario wrote:
> >>>>>>>>
> >>>>>>>>
> >>>>>>>> On 05/15/2011 06:12 PM, Pasi KÃrkkÃinen wrote:
> >>>>>>>>> On Sun, May 15, 2011 at 06:02:02PM +0200, Mario wrote:
> >>>>>>>>>> On 05/15/2011 05:53 PM, Pasi KÃrkkÃinen wrote:
> >>>>>>>>>>> On Sun, May 15, 2011 at 02:36:11PM +0200, Mario wrote:
> >>>>>>>>>>>> Hey everyone,
> >>>>>>>>>>>>
> >>>>>>>>>>>> I have been trying to make Xen-4.1.0 work on kernels mentioned 
> >>>>>>>>>>>> in the
> >>>>>>>>>>>> subject, without much sucess. HVM guests are not affected, only 
> >>>>>>>>>>>> PV.
> >>>>>>>>>>>>
> >>>>>>>>>>>
> >>>>>>>>>>> Below you mention gentoo xenlinux patches..
> >>>>>>>>>>>
> >>>>>>>>>>> So please be more specific about which kernel was vanilla (pvops),
> >>>>>>>>>>> and which kernels had some external patches applied..
> >>>>>>>>>>>
> >>>>>>>>>>> -- Pasi
> >>>>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>> Sorry, both kernels in subject were vanilla from kernel.org, with 
> >>>>>>>>>> xen
> >>>>>>>>>> options selected for dom0 usage.
> >>>>>>>>>> I only wanted to point out that networking works if i use kernel 
> >>>>>>>>>> patched
> >>>>>>>>>> with rebased gentoo patches.
> >>>>>>>>>> I am talking only about dom0 kernel here, domU kernel does not 
> >>>>>>>>>> seem to
> >>>>>>>>>> be the source of the problem.
> >>>>>>>>>>
> >>>>>>>>>
> >>>>>>>>> OK. What kernel is the PV domU running? What Xen version are you 
> >>>>>>>>> using? 4.1 ?
> >>>>>>>>>
> >>>>>>>>> -- Pasi
> >>>>>>>>>
> >>>>>>>>
> >>>>>>>> Well, i have tried following kernels in domU:
> >>>>>>>>
> >>>>>>>> 2.6.31.6 (i got this one from stacklet)
> >>>>>>>> 2.6.37.6-domU
> >>>>>>>> 2.6.33.4-domU
> >>>>>>>
> >>>>>>> Are these pvops/vanilla or with some patches?
> >>>>>>
> >>>>>> Those are pvops/vanilla, no patches.
> >>>>>>
> >>>>>>
> >>>>>>>
> >>>>>>>> 2.6.38.6-xen (dom0 kernel)
> >>>>>>>> 2.6.34.7-xen (dom0 kernel)
> >>>>>>>> 2.6.39-rc7-xen (dom0 kernel)
> >>>>>>>>
> >>>>>>>> None of them made any difference, they were all complaining about 
> >>>>>>>> vif.
> >>>>>>>> Yeah, I am running Xen 4.1
> >>>>>>>>
> >>>>>>>
> >>>>>>> Are you using xm/xend or xl/libxl toolstack?
> >>>>>>
> >>>>>> I am using xl/libxl with Xen 4.1
> >>>>>>
> >>>>>
> >>>>> Ok. Have you tried Jeremy's xen.git xen/stable-2.6.32.x as a dom0 
> >>>>> kernel?
> >>>>> It would be interesting to know if that works for you or not.
> >>>>>
> >>>>
> >>>> Btw. Did you realize upstream 2.6.38 / 2.6.39 does not yet have
> >>>> xen-blkback driver included? also blktap2 driver is missing.
> >>>>
> >>>> So you you can only use the phy: or file: backends, assuming Xen 4.1,
> >>>> which has the (slow) fallback qemu-based userspace blkback 
> >>>> implementation.
> >>>>
> >>>> -- Pasi
> >>>>
> >>>>
> >>>>
> >>>
> >>> Yes i have, but seeing that HVM networking works, i wanted to report the
> >>> PV one that doesn't.
> >>>
> >>>
> >>> m.
> >>>
> >>>
> >>>>>>>
> >>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>>>> Error that i see in dmesg on the domU:
> >>>>>>>>>>>> XENBUS: Timeout connecting to device: device/vif/0 (state 1)
> >>>>>>>>>>>>
> >>>>>>>>>>>> ifconfig -a on domU shows MAC address: 00:00:00:00:00:00
> >>>>>>>>>>>>
> >>>>>>>>>>>> dom0 doesn't have any vif/tap interfaces assigned to domU when i 
> >>>>>>>>>>>> do
> >>>>>>>>>>>> brctl show or ifconfig -a
> >>>>>>>>>>>>
> >>>>>>>>>>>> I don't see any errors worth mentioning in /var/log/xen, except 
> >>>>>>>>>>>> mybe
> >>>>>>>>>>>> these two:
> >>>>>>>>>>>>
> >>>>>>>>>>>> /tmp/SBo/xen-4.1.0/tools/ioemu-qemu-xen/hw/xen_blktap.c:628: 
> >>>>>>>>>>>> Init blktap
> >>>>>>>>>>>> pipes
> >>>>>>>>>>>> Could not open /var/run/tap/qemu-read-2
> >>>>>>>>>>>>
> >>>>>>>>>>>> Problem goes away when i boot 2.6.34.7 (it is the last kernel 
> >>>>>>>>>>>> that i
> >>>>>>>>>>>> have built with gentoo rebased patches).
> >>>>>>>>>>>>
> >>>>>>>>>>>> If there is something i can do to help debug this please do let 
> >>>>>>>>>>>> me know.
> >>>>>>>>>>>>
> >>>>>>>>>>>>
> >>>>>>>>>>>> Best regards,
> >>>>>>>>>>>> mario
> >>>>>>>>>>>>
> >>>>>>>>>>>> _______________________________________________
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> >
> >



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