linux-kernel - Re: [PATCH 4/4] sched/fair: Proportional newidle balance

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Message-ID: <20260204132710.GK2995752@noisy.programming.kicks-ass.net>
Date: Wed, 4 Feb 2026 14:27:10 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: "Mohamed Abuelfotoh, Hazem" <abuehaze@...zon.com>
Cc: Mario Roy <marioeroy@...il.com>, Chris Mason <clm@...a.com>,
	Joseph Salisbury <joseph.salisbury@...cle.com>,
	Adam Li <adamli@...amperecomputing.com>,
	Josh Don <joshdon@...gle.com>, mingo@...hat.com,
	juri.lelli@...hat.com, vincent.guittot@...aro.org,
	dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
	mgorman@...e.de, vschneid@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] sched/fair: Proportional newidle balance

On Wed, Feb 04, 2026 at 12:45:41PM +0000, Mohamed Abuelfotoh, Hazem wrote:

> Version           | Benchmark name   | SUT EC2 Instance| diff %
> v6.12.66          | postgresql       | c7a.4xlarge     | -4.0%
> v6.12.66          | nginx_lb         | c7a.4xlarge     | -5.0%
> v6.12.66          | memcached        | c7a.4xlarge     | -11.0%
> v6.12.66_proposed | postgresql       | c7a.4xlarge     | -4.0%
> v6.12.66_proposed | nginx_lb         | c7a.4xlarge     | -5.0%
> v6.12.66_proposed | memcached        | c7a.4xlarge     | -13.0%

*sigh*, that actually made it worse for memcached :/ I'm not familiar
with the memcached benchmark, is this something I can run on a single
machine, or does it require high speed networking and 2 machines?