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

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Message-ID: <Pine.LNX.4.64.0707161548000.1817@scrub.home>
Date:	Mon, 16 Jul 2007 16:01:17 +0200 (CEST)
From:	Roman Zippel <zippel@...ux-m68k.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	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, Ingo Molnar wrote:

> to sum it up: a nice +19 task (the most commonly used nice level in 
> practice) gets 9.1%, 3.9%, 3.1% of CPU time on the old scheduler, 
> depending on the value of HZ. This is quite inconsistent and illogical.

You're correct that you can find artifacts in the extreme cases, it's 
subjective whether this is a serious problem.
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.

bye, Roman
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