[PVE-User] "CPU units" breaks virtio

Tomasz Chmielewski mangoo at wpkg.org
Mon Jun 15 14:08:59 CEST 2009

Dietmar Maurer wrote:
>>>> Do you have any ideas what can be done about it?
>>> I have no idea, sorry - if this is a scheduler issue, why does it
>> only
>>> affect virtio?
>> I don't know, perhaps it changes the accounting somehow? Or OpenVZ
> code
>> does not integrate well with KVM?
>> I'm not familiar with the code, sorry.
>> BTW, couldn't a similar feature be made using cgroups only (see
>> Documentation/cgroups/ in kernel sources), without any additional
>> patching?
> Sure, but only with newer kernel and no openvz (openvz has its own
> scheduler patches).

Yes, they (OpenVZ) lag after the upstream kernel.

But this issue can leave a generally bad impression that "KVM is slow", 
for those who use virtio_net.

Tomasz Chmielewski

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