linux-kernel - Re: [PATCH V6 3/6] sched/fair: Fair server interface

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Message-ID: <20240412074316.GF30852@noisy.programming.kicks-ass.net>
Date: Fri, 12 Apr 2024 09:43:16 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Daniel Bristot de Oliveira <bristot@...nel.org>
Cc: Ingo Molnar <mingo@...hat.com>, Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>,
	linux-kernel@...r.kernel.org,
	Luca Abeni <luca.abeni@...tannapisa.it>,
	Tommaso Cucinotta <tommaso.cucinotta@...tannapisa.it>,
	Thomas Gleixner <tglx@...utronix.de>,
	Joel Fernandes <joel@...lfernandes.org>,
	Vineeth Pillai <vineeth@...byteword.org>,
	Shuah Khan <skhan@...uxfoundation.org>,
	Phil Auld <pauld@...hat.com>,
	Suleiman Souhlal <suleiman@...gle.com>,
	Youssef Esmat <youssefesmat@...gle.com>
Subject: Re: [PATCH V6 3/6] sched/fair: Fair server interface

On Thu, Apr 11, 2024 at 05:02:41PM +0200, Daniel Bristot de Oliveira wrote:
> On 4/11/24 16:43, Peter Zijlstra wrote:

> > The 'defer' thing is dubious though, I don't suppose anybody would ever
> > want to actually change that, other than you while poking around at this
> > code, right?
> 
> In a setup where all real-time tasks are DL (without fixed-priority tasks (FIFO/RR))
> the defer = 0 makes more sense because the bandwidth is reserved anyways, and the
> DL server would have a relatively low prio (long period).

Tell me more -- how is it better in that case? I would think it wouldn't
matter much.