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

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Message-ID: <20070717080230.GC13539@elte.hu>
Date:	Tue, 17 Jul 2007 10:02:30 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Roman Zippel <zippel@...ux-m68k.org>
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

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

> Nice level 19 shows the largest artifacts, as that level only gets a 
> single tick, so the ratio is often 1:HZ/10 (except for 1000HZ where 
> it's 5:100). [...]

Roman, please do me a favor, and ask me the following question:

 " Ingo, you've been maintaining the scheduler for years. In fact you 
   wrote the old nice code we are talking about here. You changed it a
   number of times since then. So you really know what's going on here. 
   Why does the old nice code behave like that for nice +19 levels? "

I've been waiting for that obvious question, and i _might_ be able to 
answer it, but somehow it never occured to you ;-) Thanks,

	Ingo
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