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

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Message-ID: <502BA7DC.7060907@linux.intel.com>
Date:	Wed, 15 Aug 2012 06:45:00 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Alex Shi <alex.shi@...el.com>,
	Suresh Siddha <suresh.b.siddha@...el.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>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Turner <pjt@...gle.com>
Subject: Re: [discussion]sched: a rough proposal to enable power saving in
 scheduler

On 8/15/2012 4:05 AM, Peter Zijlstra wrote:
> Yay, ideally we'd also provide a 3rd option: auto, which simply switches
> between the two based on AC/BAT, UPS 

nooooooo!

anything but this.
if anyone thinks that AC/Battery matters for power sensitivity... they need to go talk to a datacenter operator ;-)

seriously, there are possibly many ways to have a power/performance preference..,. but AC/battery is a very very poor one.

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