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

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Date:	Sun, 29 Apr 2007 08:59:01 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Willy Tarreau <w@....eu>
Cc:	Kasper Sandberg <lkml@...anurb.dk>,
	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


* Willy Tarreau <w@....eu> wrote:

> I don't know if Mike still has problems with SD, but there are now 
> several interesting reports of SD giving better feedback than CFS on 
> real work. In my experience, CFS seems smoother on *technical* tests, 
> which I agree that they do not really simulate real work.

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!)

	Ingo
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