Re: strange guest slowness after some time

[Tomasz Chmielewski <mangoo@wpkg.org>]

Tomasz Chmielewski schrieb:
> 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.

Actually, I don't think that I checked tsc, because when I changed to jiffies, the time has stopped:

# echo jiffies > /sys/devices/system/clocksource/clocksource0/current_clocksource
# date
Mon Mar  9 12:29:00 CET 2009
# date
Mon Mar  9 12:29:00 CET 2009
# date
Mon Mar  9 12:29:00 CET 2009
# date
Mon Mar  9 12:29:00 CET 2009
# date
Mon Mar  9 12:29:00 CET 2009

And I couldn't change to anything else any more:

# echo tsc > /sys/devices/system/clocksource/clocksource0/current_clocksource
# cat /sys/devices/system/clocksource/clocksource0/current_clocksource
jiffies
# echo kvm-clock > /sys/devices/system/clocksource/clocksource0/current_clocksource
# cat /sys/devices/system/clocksource/clocksource0/current_clocksource
jiffies


So I had to kill the guest and start it again (the above is reproduced on another,
"non-poisoned" guest).


-- 
Tomasz Chmielewski
http://wpkg.org