linux-kernel - Re: [PATCH] sched/deadline: Remove fair-servers from real-time task's bandwidth accounting

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Message-ID: <0edd4faab01a9845fd4c847d2e5c465a@codethink.co.uk>
Date: Fri, 25 Jul 2025 19:22:30 +0200
From: Matteo Martelli <matteo.martelli@...ethink.co.uk>
To: Yuri Andriaccio <yurand2000@...il.com>
Cc: bsegall@...gle.com, dietmar.eggemann@....com, juri.lelli@...hat.com,
	linux-kernel@...r.kernel.org, luca.abeni@...tannapisa.it, mgorman@...e.de,
	mingo@...hat.com, peterz@...radead.org, rostedt@...dmis.org,
	vincent.guittot@...aro.org, vschneid@...hat.com,
	yuri.andriaccio@...tannapisa.it
Subject: Re: [PATCH] sched/deadline: Remove fair-servers from real-time task's
 bandwidth accounting

Hi Yuri,

On Fri, 25 Jul 2025 17:28:04 +0200, Yuri Andriaccio <yurand2000@...il.com> wrote:
> Hi,
> 
> Thank you very much for your testing, I'm very glad to know that the patch works
> as intended.
> 
> At first glance, I think the warnings you are having are related to this bug
> report that I posted a few days ago:
> https://lore.kernel.org/all/20250718113848.193139-1-yurand2000@gmail.com/
> 
> Juri Lelli checked it out and made a patch that addresses these warns here:
> https://lore.kernel.org/all/20250721-upstream-fix-dlserver-lessaggressive-b4-v1-1-4ebc10c87e40@redhat.com/
> 
> Have you already applied Juri's patch together with mine? If not, I think it
> should solve those issues you mentioned.

No, I dind't apply Juri's patch before the previously mentioned tests.
I've now applied it on top of yours and I've just rerun the same tests.
I confirm that stress-ng and runtime variations commands provide the
same results, but that the warnings are not produced anymore.

> 
> Have a nice day,
> Yuri
> 

Best regards,
Matteo