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

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Message-ID: <20120816053133.GA31623@srcf.ucam.org>
Date:	Thu, 16 Aug 2012 06:31:34 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Alex Shi <alex.shi@...el.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	vincent.guittot@...aro.org, svaidy@...ux.vnet.ibm.com,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [discussion]sched: a rough proposal to enable power saving in
 scheduler

On Thu, Aug 16, 2012 at 01:03:32PM +0800, Alex Shi wrote:
> On 08/16/2012 12:19 AM, Matthew Garrett wrote:
> > Are there workloads in which "power" might provide more performance than 
> > "performance"? If so, don't use these terms.
> 
> Power scheme should no chance has better performance in design.

Power will tend to concentrate processes on packages, while performance 
will tend to split them across packages? What if two cooperating 
processes gain from being on the same package and sharing cache 
locality?

-- 
Matthew Garrett | mjg59@...f.ucam.org
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