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

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Date:	Thu, 23 Aug 2012 16:19:06 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Ingo Molnar <mingo@...nel.org>
CC:	Matthew Garrett <mjg59@...f.ucam.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	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 08/22/2012 05:10 PM, Ingo Molnar wrote:

> 
> * Matthew Garrett <mjg59@...f.ucam.org> wrote:
> 
>> [...]
>>
>> Our power consumption is worse than under other operating 
>> systems is almost entirely because only one of our three GPU 
>> drivers implements any kind of useful power management. [...]
> 
> ... and because our CPU frequency and C state selection logic is 
> doing pretty much the worst possible decisions (on x86 at 
> least).
> 
> Regardless, you cannot possibly seriously suggest that because 
> there's even greater suckage elsewhere for some workloads we 
> should not even bother with improving the situation here.
> 
> Anyway, I agree with Alan that actual numbers matter.


Sure. we'd better make ideas into code, and then let benchmarks and data
speaking.

> 
> Thanks,
> 
> 	Ingo


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