linux-kernel - Re: [REPORT] cfs-v4 vs sd-0.44

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Message-ID: <20070425092919.GB498@elte.hu>
Date:	Wed, 25 Apr 2007 11:29:19 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Rogan Dawes <lists@...es.za.net>
Cc:	Chris Friesen <cfriesen@...tel.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>,
	Gene Heskett <gene.heskett@...il.com>,
	Juliusz Chroboczek <jch@....jussieu.fr>,
	Mike Galbraith <efault@....de>, linux-kernel@...r.kernel.org,
	Peter Williams <pwil3058@...pond.net.au>,
	ck list <ck@....kolivas.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	William Lee Irwin III <wli@...omorphy.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Bill Davidsen <davidsen@....com>, Willy Tarreau <w@....eu>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [REPORT] cfs-v4 vs sd-0.44


* Rogan Dawes <lists@...es.za.net> wrote:

> My concern was that since Ingo said that this is a closed economy, 
> with a fixed sum/total, if we lose a nanosecond here and there, 
> eventually we'll lose them all.

it's not a closed economy - the CPU constantly produces a resource: "CPU 
cycles to be spent", and tasks constantly consume that resource. So in 
that sense small inaccuracies are not a huge issue. But you are correct 
that each and every such inaccuracy has to be justified. For example 
larger inaccuracies on the order of SCHED_LOAD_SCALE are a problem 
because they can indeed sum up, and i fixed up a couple of such 
inaccuracies in -v6-to-be.

	Ingo
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