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.

I've been running it for about a week now with kvm-84 and no guest got slow.

Can it be related to using cpufreq and ondemand governor?

1) with kvm-83 and cpufreq/ondemand, guests go totally crazy (see 
"Houston, we have May 15, 1953" thread)

2) with kvm-83 without cpufreq, "slowness" affects guests sometimes

3) with kvm-84 and cpufreq/ondemand, "slowness" affects guests sometimes

4) with kvm-84 without cpufreq, everything run correctly (at least it 
does for a week now)


Does anything from this make any sense? I would really like to use 
cpufreq/ondemand on the host with KVM, as my tests show it would save me 
about 50 EUR on electricity bills per one of such servers yearly.


-- 
Tomasz Chmielewski
http://wpkg.org