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

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Message-ID: <5034D878.1000305@linux.intel.com>
Date:	Wed, 22 Aug 2012 06:02:48 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Mike Galbraith <efault@....de>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ingo Molnar <mingo@...nel.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	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 8/21/2012 10:41 PM, Mike Galbraith wrote:
> 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 if you don't spread, you will waste some power.
but.. current linux behavior is to spread.
so we can only make it worse.


> 
> 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. 

I'd expect to see a negative result ;-)

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