netdev - Re: BBR and TCP internal pacing causing interrupt storm with pfifo

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Message-ID: <CANn89i+OoMLmx4jRTSRX8Svka0FRo-hPM-CqOxb9NJhV9KS7iQ@mail.gmail.com>
Date:   Mon, 15 Oct 2018 07:50:41 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     Gasper Zejn <zelo.zejn@...il.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>, Kevin Yang <yyd@...gle.com>,
        netdev <netdev@...r.kernel.org>
Subject: Re: BBR and TCP internal pacing causing interrupt storm with pfifo_fast

On Mon, Oct 15, 2018 at 3:26 AM Gasper Zejn <zelo.zejn@...il.com> wrote:
>
>
> I've tried to isolate the issue as best I could. There seems to be an
> issue if the TCP socket has keepalive set and send queue is not empty
> and the route goes away.
>
> https://github.com/zejn/bbr_pfifo_interrupts_issue
>
> Hope this helps,
> Gasper

This is awesome Gasper, I will take a look thanks.

Note that we are about to send a patch series (targeting net-next) to
polish the EDT patch series that was merged last month for linux-4.20.
TCP internal pacing is going to be much better performance-wise.