linux-kernel - Re: [PATCH net-next V2 0/2] virtio-net: don't busy poll for cvq command

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Date:   Fri, 14 Apr 2023 12:53:58 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     mst@...hat.com, davem@...emloft.net, edumazet@...gle.com,
        pabeni@...hat.com, virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, maxime.coquelin@...hat.com,
        alvaro.karsz@...id-run.com, eperezma@...hat.com,
        xuanzhuo@...ux.alibaba.com, david.marchand@...hat.com
Subject: Re: [PATCH net-next V2 0/2] virtio-net: don't busy poll for cvq command

On Thu, Apr 13, 2023 at 10:04 PM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Thu, 13 Apr 2023 14:40:25 +0800 Jason Wang wrote:
> > The code used to busy poll for cvq command which turns out to have
> > several side effects:
> >
> > 1) infinite poll for buggy devices
> > 2) bad interaction with scheduler
> >
> > So this series tries to use sleep instead of busy polling. In this
> > version, I take a step back: the hardening part is not implemented and
> > leave for future investigation. We use to aggree to use interruptible
> > sleep but it doesn't work for a general workqueue.
>
> CC: netdev missing?

My bad. Will cc netdev for any discussion.

Thanks

>