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

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Message-ID: <Pine.LNX.4.64.0707162351030.1817@scrub.home>
Date:	Tue, 17 Jul 2007 00:13:08 +0200 (CEST)
From:	Roman Zippel <zippel@...ux-m68k.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Matt Mackall <mpm@...enic.com>, 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:

> and note that even on the old scheduler, nice-0 was "3200% more 
> powerful" than nice +19 (with CONFIG_HZ=300),

How did you get that value? At any HZ the ratio should be around 1:10
(+- rounding error).

> in fact i like it that nice -20 has a slightly bigger punch than it used 
> to have before:

"Slightly bigger"??? You're joking, right?
Especially the user levels are doing something completely different now, 
which may break user expectation. While the user couldn't expect anything 
precise, it's still a big difference whether a process at nice 5 gets 75% 
of the time or only 30%.

bye, Roman
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