Re: strange guest slowness after some time

[Tomasz Chmielewski <mangoo@wpkg.org>]

Avi Kivity schrieb:

>>>>> I'm guessing there's a problem with timers or timer interrupts.
>>>>>
>>>>> What is the host cpu?
>>>>
>>>> 4 entries like this in /proc/cpuinfo:
>>>>
>>>> processor       : 3
>>>> vendor_id       : AuthenticAMD
>>>> cpu family      : 15
>>>> model           : 65
>>>> model name      : Dual-Core AMD Opteron(tm) Processor 2212
>>>>
>>>
>>> That's probably the kvmclock issue that hit older AMDs.  It was fixed 
>>> in kvm-84, please try that.
>>
>> It is kvm-84, I have it running since Saturday (but I had this issue 
>> with kvm-83 as well).
>>
> 
> And the problem continues?
> 
> What's your current clocksource (in the guest)?  Does changing it help?
> 
> See /sys/devices/system/clocksource/clocksource0/*.

It was kvm-clock.
I tried changing it to acpi_pm, jiffies, tsc, but it made no difference.


>>> I meant 'taskset 01 qemu ...' but it wouldn't have helped if it's 
>>> kvmclock.
>>
>> It can be done on a running process as well (22906 is the PID of the 
>> affected gue
> 
> Right, but if the guest is poisoned somehow, this won't help.

Yep, it seems poisoned.
I'll start the guest again in the evening, will add it a e1000 card.

If the problem reappears, it would be good to see if it affect only 
virtio card or not (I've never seen this issue on a guest which doesn't 
use virtio drivers - so far at least).


-- 
Tomasz Chmielewski
http://wpkg.org