linux-kernel - Re: [RFC v1] Tunable sched_mc_power

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Date:	Thu, 26 Jun 2008 23:43:04 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	dipankar@...ibm.com, balbir@...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>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Vatsa <vatsa@...ux.vnet.ibm.com>,
	Gautham R Shenoy <ego@...ibm.com>
Subject: Re: [RFC v1] Tunable sched_mc_power_savings=n

On Thu, 2008-06-26 at 23:37 +0200, Andi Kleen wrote:
> Dipankar Sarma wrote:
> 
> > Some workload managers already do that - they provision cpu and memory
> > resources based on request rates and response times. Such software is
> > in a better position to make a decision whether they can live with
> > reduced performance due to power saving mode or not. The point I am
> > making is the the kernel doesn't have any notion of transactional
> > performance 
> 
> The kernel definitely knows about burstiness vs non burstiness at least
> (although it currently has no long term memory for that). Does it need
> more than that for this? Anyways if nice levels were used that is not
> even needed, because it's ok to run niced processes slower.
> 
> And your workload manager could just nice processes. It should probably
> do that anyways to tell ondemand you don't need full frequency.

Except that I want my nice 19 distcc processes to utilize as much cpu as
possible, but just not bother any other stuff I might be doing...



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