linux-kernel - Re: [RFC PATCH v2 0/2] Saving power by cpu evacuation sched_max_capacity

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Date:	Wed, 13 May 2009 16:36:42 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Suresh B Siddha <suresh.b.siddha@...el.com>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Vatsa <vatsa@...ux.vnet.ibm.com>,
	Gautham R Shenoy <ego@...ibm.com>,
	Gregory Haskins <gregory.haskins@...il.com>,
	Mike Galbraith <efault@....de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arun Bharadwaj <arun@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH v2 0/2] Saving power by cpu evacuation
 sched_max_capacity_pct=n

On Wed, 2009-05-13 at 16:35 +0200, Andi Kleen wrote:
> On Wed, May 13, 2009 at 06:41:00PM +0530, Vaidyanathan Srinivasan wrote:
> > * Using sched_mc=3,4,5 to evacuate 1,2,4 cores is completely
> >   non-intuitive and broken interface.  Ingo wanted to see if we can
> >   model a global percentile tunable that would map to core throttling.
> 
> I have one request. CPU throttling is already a very well established
> term in the x86 world, refering to thermal throttling when the CPU
> overheats. This is implemented by ACPI and the CPU. It's always
> a very bad thing that should be avoided at all costs.

Its about avoiding that.

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