linux-kernel - Re: [RFC 1/2] softirq: Defer net rx/tx processing to ksoftirqd context

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Date:   Tue, 6 Feb 2018 17:56:49 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     David Miller <davem@...emloft.net>
Cc:     edumazet@...gle.com, tglx@...utronix.de,
        torvalds@...ux-foundation.org, efault@....de, peterz@...radead.org,
        dima@...sta.com, frederic@...nel.org, linux-kernel@...r.kernel.org,
        0x7f454c46@...il.com, akpm@...ux-foundation.org,
        fweisbec@...il.com, hannes@...essinduktion.org, mingo@...nel.org,
        alexander.levin@...izon.com, pabeni@...hat.com,
        paulmck@...ux.vnet.ibm.com, rrendec@...sta.com, riel@...hat.com,
        sgruszka@...hat.com, wanpeng.li@...mail.com
Subject: Re: [RFC 1/2] softirq: Defer net rx/tx processing to ksoftirqd
 context

On 2018-01-17 17:24:47 [-0500], David Miller wrote:
> From: Eric Dumazet <edumazet@...gle.com>
> Date: Wed, 17 Jan 2018 14:02:43 -0800
> > There is also the netif_rx_ni() stuff.
> > 
> > Can't remember right now why it is not using
> > local_bh_{diable,enable}() pair instead
> > of preempt_disable() ... if (local_softirq_pending()) do_softirq();
> 
> Hmmm, that code predates the initial GIT repository build.
> 
> I do remember we had some back and forth with that stuff.

So I did a little research and tried to replace preempt_disable() with
local_bh_disable() [0] a while ago.

[0] https://lkml.kernel.org/r/20170616172400.10809-1-bigeasy@linutronix.de

Sebastian