Re: strange guest slowness after some time

[Tomasz Chmielewski <mangoo@wpkg.org>]

Avi Kivity schrieb:
> Tomasz Chmielewski wrote:
>> 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).

# dmesg | grep kvm
(...)
loaded kvm module (kvm-84)

# modinfo kvm
filename:       /lib/modules/2.6.24-2-pve/kernel/arch/x86/kvm/kvm.ko
version:        kvm-84

# kvm -h
QEMU PC emulator version 0.9.1 (kvm-84), Copyright (c) 2003-2008 Fabrice 
Bellard


>>> Does the problem occur if you pin a guest to a cpu with taskset?
>>
>> Like this?
>>
>> # taskset -p 01 22906
>>
> 
> 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 guest).
And the issue is hard to reproduce (shows up after 1-7 days on a random 
guest).


-- 
Tomasz Chmielewski
http://wpkg.org