Re: massive performance drop after a while when using virtio nics

Yann Dupont
2008-09-09T11:54:14Z

Mark McLoughlin a écrit :
> Hi,
>
> On Sat, 2008-08-23 at 21:21 +0200, Fabian Deutsch wrote:
>
>> Hey.
>>
>> When running a guest in the following setup, I observ a "massive"
>> performance decrease after a couple of gigabytes of transfrerred data.
>>
>> other guests keep running fine (no regressions) and nothing unusual is
>> observed on the host.
>>
>
> If you do "killall -ALRM qemu-kvm" after the slowdown has occurred, does
> it make things speed up again for a while?
>
>
Too soon to say if it works for us as it seems the problem is long to
trigger in our case ; Anyway as the problem seems similar, it's good to
know it is probably fixed.

> If so, the issue is fixed by:
>
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=ba661292a2bc6ddd305a212b0526e5dc22195fe7
>
> It also got applied in 2.6.26.3 and 2.6.25.16.
>
>
Ok, so upgrading the kernel is sufficient ?

> Cheers,
> Mark.
>
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>
Thanks for the answer,
greetings,

--
Yann Dupont - Service IRTS, DSI Université de Nantes
Tel : 02.51.12.53.91 - Mail/Jabber : Yann.Dupont@univ-nantes.fr