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Gmane
From: Peter Zijlstra <peterz <at> infradead.org>
Subject: Re: [RFC v1] Tunable sched_mc_power_savings=n
Newsgroups: gmane.linux.kernel
Date: Thursday 26th June 2008 21:43:04 UTC (over 8 years ago)
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...
 
CD: 3ms