linux-kernel - Re: x264 benchmarks BFS vs CFS

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Date:	Sun, 20 Dec 2009 14:09:07 +0100
From:	Kasper Sandberg <lkml@...anurb.dk>
To:	Andres Freund <andres@...razel.de>
Cc:	Mike Galbraith <efault@....de>, Con Kolivas <kernel@...ivas.org>,
	Jason Garrett-Glaser <darkshikari@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML Mailinglist <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: x264 benchmarks BFS vs CFS

On Sun, 2009-12-20 at 13:10 +0100, Kasper Sandberg wrote:
> On Sun, 2009-12-20 at 04:22 +0100, Andres Freund wrote:
> > On Saturday 19 December 2009 18:36:03 Kasper Sandberg wrote:
> > > Try this on a dualcore or quadcore system, or ofcourse just set the<
> > > niceness accordingly...
> > Oh well. This is getting too much for a normally very silent and flame fearing 
> > reader. Didnt *you* just tell others to shut up about using any tunables for 
> > any application? And that you dont need any tunables for BFS?
oh and btw, the niceness is not really a tunable"
> 
> That was an entirely different case, have you even been following the
> thread?
> 
> OFCOURSE you're going to see slowdowns on a UP system if you have a cpu
> hog and then run something else, this is the only behavior possible, and
> bfs handles it in a fair way.
> 
> when i said we needed no tunables, that was for running a _SINGLE_
> application, and then measuring said applications performance. (where
> BFS indeed does beat CFS by a quite large margin)
> 
> and as for CFS, it SHOULD exhibit fair behavior anyway, isnt it called
> "completely FAIR scheduler" ? or is that just the marketing name?
> 
> 
> 
> > 
> > Andres
> 
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