linux-kernel - Re: [RFC][PATCH 0/5] sched: Try and address some recent-ish regressions

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Message-ID: <20250614101528.GJ2278213@noisy.programming.kicks-ass.net>
Date: Sat, 14 Jun 2025 12:15:28 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: K Prateek Nayak <kprateek.nayak@....com>
Cc: mingo@...hat.com, juri.lelli@...hat.com, vincent.guittot@...aro.org,
	linux-kernel@...r.kernel.org, dietmar.eggemann@....com,
	rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
	vschneid@...hat.com, clm@...a.com
Subject: Re: [RFC][PATCH 0/5] sched: Try and address some recent-ish
 regressions

On Fri, Jun 13, 2025 at 08:58:56AM +0530, K Prateek Nayak wrote:

> - schbench (old) has a consistent regression for 16, 32, 64,
>   128, 256 workers (> CCX size, < Overloaded) except for with
>   256 workers case with TTWU_QUEUE_DEFAULT which shows an
>   improvement.
> 
> - new schebench has few regressions around 32, 64, and 128
>   workers for wakeup and request latency.

Right, so I actually made Chris' favourite workloads worse with these
patches :/

Let me go try this again..