Re: [Xen-users] Xen system hang or freeze

[Martin Fernau <m.fernau@xxxxxxxxxx>]

Hello,

did you find out anything helpful about this problem?
I just had this freeze this morning again. Server freezed and no guests 
working any more. After 5 weeks of normal running. It seems that this is my 
intervall of this problem.

I really appreciated anything helpful about this! I'm totally stuck with this 
problem...

Martin

Am Freitag, 24. April 2009 schrieb Nick Anderson:
> On Thu, Apr 23, 2009 at 10:01:02PM -0400, Peter Booth wrote:
> > Nick,
> > When you got the "soft lockup" errors were they always with CPU0?
>
> Yes I believe so. But since I updated to the latest debian patched
> kernel I havent seen that soft lockup error.
>
> > Do you have any nesting in your LVM definitions?
>
> No
>
> > Is dom0 making use of LVM?
>
> No it is not.
>
> > Does the host have a wireless card?
>
> No
>
> > What graphics card does it have?
>
> Just the onboard graphics 01:05.0 VGA compatible controller: ATI
> Technologies Inc ES1000 (rev 02)
>
> > There is a Xen 2.6.18 kernel bug that might be related to what you see,
> > as well as a patch:
> > http://www.mail-archive.com/debian-kernel@xxxxxxxxxxxxxxxx/msg40893.html
>
> Yes I think that patch is in the latest kernel update which made the
> soft lockup messages go away. Odly everyone else that noted the soft
> lockup errors only noted them as an annoyance. I don't recall ever
> seeing anyone link the messages with any actual undesirable behavior
> outside of the msgs themselves.
>
> > I appreciate that this freezing occurs when the system is quiet, but it
> > seems as if the hypervisor CPU scheduler might play some part in this,
> > such that the guest vcpus don't get scheduled on a pcpu. If it were me I
> > would try limiting dom0 to four vcpus - not as a long-term
> > configuration, but to see whether the problem recurred when we know that
> > each domU should have an available CPU.
>
> I was considering that. I also thought it interesting that each of the
> domUs are running on vcpu0. I figured they would automatically
> distribute to a free vcpu.



-- 
Mit freundlichem Gruß,
Martin Fernau


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