linux-kernel - Re: [PATCH] CFS: Fix missing digit off in wmult table

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Message-ID: <Pine.LNX.4.64.0707162304330.1817@scrub.home>
Date:	Mon, 16 Jul 2007 23:25:59 +0200 (CEST)
From:	Roman Zippel <zippel@...ux-m68k.org>
To:	Matt Mackall <mpm@...enic.com>
cc:	Ingo Molnar <mingo@...e.hu>, James Bruce <bruce@...rew.cmu.edu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mike Galbraith <efault@....de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...radead.org>,
	Chris Wright <chrisw@...s-sol.org>
Subject: Re: [PATCH] CFS: Fix missing digit off in wmult table

Hi,

On Mon, 16 Jul 2007, Matt Mackall wrote:

> > It's nice that these artifacts are gone, but that still doesn't explain 
> > why this ratio had to be increase that much from around 1:10 to 1:69.
> 
> More dynamic range is better? If you actually want a task to get 20x
> the CPU time of another, the older scheduler doesn't really allow it.

You can already have that, the complete range level from 19 to -20 was 
about 1:80.
There is also something like too much range, I tried it with top at 19 and 
as soon as something runs at -20 it's practically dead, because it gets 
now only 1/5900 of cpu time.

bye, Roman
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