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

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Message-ID: <20070716121246.GA17880@elte.hu>
Date:	Mon, 16 Jul 2007 14:12:46 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Roman Zippel <zippel@...ux-m68k.org>
Cc:	James Bruce <bruce@...rew.cmu.edu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mike Galbraith <efault@....de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrea Arcangeli <andrea@...e.de>,
	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


* Roman Zippel <zippel@...ux-m68k.org> wrote:

> On Mon, 16 Jul 2007, Ingo Molnar wrote:
> 
> > > As soon as you add another loop the difference changes again, 
> > > while it's always correct to say it gets 25% more cpu time [...]
> > 
> > yep, and i'll add the relative effect to the comment too.
> 
> Why did you cut off the rest of the sentence?

(no need to become hostile, i answered to that portion of your sentence 
separately, which was logically detached from the other portion of your 
sentence. I marked the cut with the '[...]' sign. )

> To illustrate the problem a little different: a task with a nice level 
> -20 got around 700% more cpu time (or 8 times more), now it gets 8500% 
> more cpu time (or 86.7 times more). You don't think that change to the 
> nice levels is a little drastic?

This was discussed on lkml in detail, see the CFS threads. It has been a 
common request for nice levels to be more logical (i.e. to make them 
universal and to detach them from HZ) and for them to be more effective 
as well.

	Ingo
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