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xen-devel
Re: [Xen-devel] pvops domu soft lockup under load (more logs)
On 04/15/2010 03:56 AM, Pim van Riezen wrote:
> On Apr 14, 2010, at 19:48 , Jeremy Fitzhardinge wrote:
>
>
>> Does it appear on the Xen console (visible with "xm dmesg")? You may
>> need to do a sysrq '9' first to get it to output all messages.
>>
> Does that sysrq have to go to dom0 or to the domU?
>
To the locked-up domU.
> I also got the tip from someone on xen-users to take a look at the clock
> source, and setting
> /sys/devices/system/clocksource/clocksource0/current_clocksource to 'jiffies'
> does seem to stop the lockups from happening. The fact that I've witnessed
> other kernel timekeeping going wonky on these guests, the fact that this
> helps does seem intuitively right, but I don't know if it gives you enough to
> work with.
>
I've seen similar lockups at a very low rate. The clocksource
workaround just confuses me; the whole thing stumps me. The main piece
of evidence I haven't managed to get yet is a complete process dump
(sysrq-t) to see who's waiting on what.
Also, could you try 2.6.32.11, which has some timer-related fixes in it,
that may or may not help.
J
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