netdev - Re: [PATCH v6 net-next 08/15] net: softnet_data: Make xmit.recursion per task.

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Date: Fri, 14 Jun 2024 18:04:45 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Paolo Abeni <pabeni@...hat.com>
Cc: Eric Dumazet <edumazet@...gle.com>,
	Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Daniel Bristot de Oliveira <bristot@...nel.org>,
	Boqun Feng <boqun.feng@...il.com>,
	Daniel Borkmann <daniel@...earbox.net>,
	Frederic Weisbecker <frederic@...nel.org>,
	Ingo Molnar <mingo@...hat.com>, Jakub Kicinski <kuba@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Waiman Long <longman@...hat.com>, Will Deacon <will@...nel.org>,
	Ben Segall <bsegall@...gle.com>,
	Daniel Bristot de Oliveira <bristot@...hat.com>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Juri Lelli <juri.lelli@...hat.com>, Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>
Subject: Re: [PATCH v6 net-next 08/15] net: softnet_data: Make xmit.recursion
 per task.

On 2024-06-14 16:08:42 [+0200], Paolo Abeni wrote:
> 
> I personally think (fear mostly) there is still the potential for some
> (performance) regression. I think it would be safer to introduce this
> change under a compiler conditional and eventually follow-up with a
> patch making the code generic.
> 
> Should such later change prove to be problematic, we could revert it
> without impacting the series as a whole. 

Sounds reasonable. In that case let me stick with "v6.5" of this patch
(as just posted due the `more' member) and then I could introduce an
option for !RT to use this optionally so it can be tested widely.

> Thanks!
> 
> Paolo

Sebastian