linux-kernel - Re: [RFC PATCH net-next 0/2] net: Use SMP threads for backlog NAPI.

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Message-ID: <CANn89iKAR_i7_P5oTnhywyqCr_V7doskhckM_HiO+q0ao2gJUw@mail.gmail.com>
Date:   Fri, 18 Aug 2023 18:40:13 +0200
From:   Eric Dumazet <edumazet@...gle.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Yan Zhai <yan@...udflare.com>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Paolo Abeni <pabeni@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Wander Lairson Costa <wander@...hat.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>
Subject: Re: [RFC PATCH net-next 0/2] net: Use SMP threads for backlog NAPI.

On Fri, Aug 18, 2023 at 6:21 PM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Fri, 18 Aug 2023 16:57:34 +0200 Sebastian Andrzej Siewior wrote:
> > As of now Jakub isn't eager to have it and my testing/ convincing is
> > quite limited. If nobody else yells that something like that would be
> > helpful I would simply go and convince PeterZ/tglx to apply 2/2 of this
> > series.
>
> As tempting as code removal would be, we can still try to explore the
> option of letting backlog processing run in threads - as an opt-in on
> normal kernels and force it on RT?

+1

Patch 1/2 as presented is really scary, we would need to test it
extensively on various platforms.

>
> But it would be good to wait ~2 weeks before moving forward, if you
> don't mind, various core folks keep taking vacations..