linux-kernel - Re: [discussion]sched: a rough proposal to enable power saving in scheduler

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Date:	Wed, 22 Aug 2012 07:41:50 +0200
From:	Mike Galbraith <efault@....de>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Alex Shi <alex.shi@...el.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	vincent.guittot@...aro.org, svaidy@...ux.vnet.ibm.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Turner <pjt@...gle.com>
Subject: Re: [discussion]sched: a rough proposal to enable power saving in
 scheduler

On Tue, 2012-08-21 at 17:02 +0100, Alan Cox wrote:

> I'd like to see actual numbers and evidence on a wide range of workloads
> the spread/don't spread thing is even measurable given that you've also
> got to factor in effects like completing faster and turning everything
> off. I'd *really* like to see such evidence on a laptop,which is your
> one cited case it might work.

For my dinky dual core laptop, I suspect you're right, but for a more
powerful laptop, I'd expect spread/don't to be noticeable.

Yeah, hard numbers would be nice to see.

If I had a powerful laptop, I'd kill irq balancing, and all but periodic
load balancing, and expect to see a positive result.  Dunno what fickle
electron gods would _really_ do with those prayers though.

-Mike

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