linux-kernel - Re: EEVDF regression still exists

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Message-ID: <20250429215604.GE4439@noisy.programming.kicks-ass.net>
Date: Tue, 29 Apr 2025 23:56:04 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Cristian Prundeanu <cpru@...zon.com>
Cc: K Prateek Nayak <kprateek.nayak@....com>,
	Hazem Mohamed Abuelfotoh <abuehaze@...zon.com>,
	Ali Saidi <alisaidi@...zon.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Geoff Blake <blakgeof@...zon.com>, Csaba Csoma <csabac@...zon.com>,
	Bjoern Doebel <doebel@...zon.com>,
	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>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Borislav Petkov <bp@...en8.de>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-tip-commits@...r.kernel.org, x86@...nel.org
Subject: Re: EEVDF regression still exists

On Tue, Apr 29, 2025 at 04:38:17PM -0500, Cristian Prundeanu wrote:
> Peter,
> 
> Here are the latest results for the EEVDF impact on database workloads. 
> The regression introduced in kernel 6.6 still persists and doesn't look 
> like it is improving.

Well, I was under the impression it had actually been solved :-(

My understanding from the last round was that Prateek and co had it
sorted -- with the caveat being that you had to stick SCHED_BATCH in at
the right place in MySQL start scripts or somesuch.

Prateek, Gautham?