linux-kernel - Re: EEVDF regression still exists

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Message-ID: <20250502084844.GT4198@noisy.programming.kicks-ass.net>
Date: Fri, 2 May 2025 10:48:44 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: "Prundeanu, Cristian" <cpru@...zon.com>
Cc: K Prateek Nayak <kprateek.nayak@....com>,
	"Mohamed Abuelfotoh, Hazem" <abuehaze@...zon.com>,
	"Saidi, Ali" <alisaidi@...zon.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"Blake, Geoff" <blakgeof@...zon.com>,
	"Csoma, Csaba" <csabac@...zon.com>,
	"Doebel, Bjoern" <doebel@...zon.de>,
	Gautham Shenoy <gautham.shenoy@....com>,
	Swapnil Sapkal <swapnil.sapkal@....com>,
	Joseph Salisbury <joseph.salisbury@...cle.com>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tip-commits@...r.kernel.org" <linux-tip-commits@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>
Subject: Re: EEVDF regression still exists

On Thu, May 01, 2025 at 04:16:07PM +0000, Prundeanu, Cristian wrote:

> (Please keep in mind that the target isn't to get SCHED_BATCH to the same
> level as 6.5-default; it's to resolve the regression from 6.5-default to
> 6.6+ default, and from 6.5-SCHED_BATCH to 6.6+ SCHED_BATCH).

No, the target definitely is not to make 6.6+ default match 6.5 default.

The target very much is getting you performance similar to the 6.5
default that you were happy with with knobs we can live with.