[Virtio-fs] 答复: [PATCH][RFC] Support multiqueue mode by setting cpu affinity

[Stefan Hajnoczi]

On Sun, Apr 26, 2020 at 02:12:15AM +0000, piaojun wrote:
> 
> 
> -----邮件原件-----
> 发件人: Eryu Guan [mailto:eguan at linux.alibaba.com] 
> 发送时间: 2020年4月24日 10:15
> 收件人: piaojun <piaojun at huawei.com>
> 抄送: Stefan Hajnoczi <stefanha at redhat.com>; virtio-fs at redhat.com
> 主题: Re: [Virtio-fs] [PATCH][RFC] Support multiqueue mode by setting cpu affinity
> 
> Hi Jun,
> 
> On Wed, Aug 28, 2019 at 03:05:01PM +0800, piaojun wrote:
> > 
> > 
> > On 2019/8/27 22:42, Stefan Hajnoczi wrote:
> > > On Mon, Aug 26, 2019 at 09:08:20AM +0800, piaojun wrote:
> > >> On 2019/8/21 23:38, Stefan Hajnoczi wrote:
> > >>> On Fri, Aug 09, 2019 at 02:04:54PM +0800, piaojun wrote:
> > >>>> Set cpu affinity for each queue in multiqueue mode to improve the 
> > >>>> iops performance.
> 
> [snip]
> 
> > > 
> > > Doing the setup before entering the sandbox sounds like a good idea.
> > > That way the sandbox does not need to whitelist the required syscalls.
> > > 
> > > Will you add an option similar to:
> > > 
> > >   --request-queues N
> > >   --request-queue-cpu-affinity N=CPU_A[,CPU_B][-CPU_C]
> > > 
> > > ?
> > 
> > I'm writing the multi-queue code for virtiofsd according to your 
> > suggestion, but the final shape may look a bit different.
> 
> Just curious, what's the status of this multi-queue support? I'd like to try it out :)
> 
> OK, I wrote a demo a few months ago, but it has little performance promote even setting CPU affinity.
> So, I'm glad you can try it.

Do you want to send RFC patches to virtio-fs at redhat.com so it can be
discussed?

A bug in the virtiofs.ko guest driver has just been discussed that
prevented multiqueue from working:
https://www.redhat.com/archives/virtio-fs/2020-April/msg00030.html
or
https://www.redhat.com/archives/virtio-fs/2020-April/msg00021.html

There is also discussion about multiqueue and performance here:
https://www.redhat.com/archives/virtio-fs/2020-April/msg00026.html

Stefan
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