Re: strange guest slowness after some time

[Felix Leimbach <felix.leimbach@gmx.net>]

Tomasz Chmielewski wrote:
> Avi Kivity schrieb:
>> Tomasz Chmielewski wrote:
>>> After a week or so, network in one guest got slow with kvm-84 and no 
>>> cpufreq.
>> This is virtio, right?  What about e1000?
>>
>> (I realize it takes a week to reproduce, but maybe you have some more 
>> experience)
>
> Yes, all affected had virtio. Probably because I didn't have many 
> guests with e1000 interface.
>
> After a guest gets slow, I stop it and add another interface, e1000.
>
>
> If it gets slow again, I'll check if e1000 interface is slow as well.
>
> Will keep you updated.
I see similar behavior: After a week one of my guests' network totally 
stops to respond. Only guests using virtio networking get hit. Both 
windows and linux guests are affected.
My guests in production use e1000 and have never been hit.
While that can be a coincidence it seems very unlikely: Out of 3 virtio 
guests 2 have been hit, one repeatedly.
Out of 3 e1000 guests none has ever been hit.

Observed with kvm-83 and kvm-84 with the host running in-kernel KVM code 
(linux 2.6.25.7)