linux-kernel - Re: [patch] CFS scheduler, -v6

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Date:	Sun, 29 Apr 2007 19:09:27 +0200
From:	Kasper Sandberg <lkml@...anurb.dk>
To:	Ray Lee <madrabbit@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Willy Tarreau <w@....eu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Gene Heskett <gene.heskett@...il.com>,
	linux-kernel@...r.kernel.org, Con Kolivas <kernel@...ivas.org>,
	Nick Piggin <npiggin@...e.de>, Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Peter Williams <pwil3058@...pond.net.au>,
	Thomas Gleixner <tglx@...utronix.de>, caglar@...dus.org.tr,
	Mark Lord <lkml@....ca>, Zach Carter <linux@...hcarter.com>,
	buddabrod <buddabrod@...il.com>
Subject: Re: [patch] CFS scheduler, -v6

On Sun, 2007-04-29 at 08:42 -0700, Ray Lee wrote:
> On 4/29/07, Kasper Sandberg <lkml@...anurb.dk> wrote:
> > On Sun, 2007-04-29 at 08:59 +0200, Ingo Molnar wrote:
> > > well, there are several reports of CFS being significantly better than
> > > SD on a number of workloads - and i know of only two reports where SD
> > > was reported to be better than CFS: in Kasper's test (where i'd like to
> > > know what the "3D stuff" he uses is and take a good look at that
> > > workload), and another 3D report which was done against -v6. (And even
> > > in these two reports the 'smoothness advantage' was not dramatic. If you
> > > know of any other reports then please let me know!)
> >
> > I can tell you one thing, its not just me that has observed the
> > smoothness in 3d stuff, after i tried rsdl first i've had lots of people
> > try rsdl and subsequently sd because of the significant improvement in
> > smoothness, and they have all found the same results.
> >
> > The stuff i have tested with in particular is unreal tournament 2004 and
> > world of warcraft through wine, both running opengl, and consuming all
> > the cpu time it can get.
> 
> [snip more of sd smoother than cfs report]
> 
> WINE is an interesting workload as it does most of its work out of
> process to the 'wineserver', which then does more work out of process
> to the X server. So, it's three mutually interacting processes total,
> once one includes the original client (Unreal Tournament or World of
> Warcraft, in this case).
the wineserver process is using next to no cpu-time compared to the main
process..

> 
> Perhaps running one of the windows system performance apps (that can
> be freely downloaded) under WINE would give some hard numbers people
> could use to try to reproduce the report.
> 
> Ray
> 

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