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

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Date:	Wed, 25 Apr 2007 11:44:03 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"Li, Tong N" <tong.n.li@...el.com>
Cc:	William Lee Irwin III <wli@...omorphy.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>,
	Juliusz Chroboczek <jch@....jussieu.fr>,
	Con Kolivas <kernel@...ivas.org>, ck list <ck@....kolivas.org>,
	Bill Davidsen <davidsen@....com>, Willy Tarreau <w@....eu>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Peter Williams <pwil3058@...pond.net.au>,
	Thomas Gleixner <tglx@...utronix.de>, caglar@...dus.org.tr,
	Gene Heskett <gene.heskett@...il.com>
Subject: Re: [REPORT] cfs-v4 vs sd-0.44


* Li, Tong N <tong.n.li@...el.com> wrote:

> [...] A corollary of this is that if both threads i and j are 
> continuously runnable with fixed weights in the time interval, then 
> the ratio of their CPU time should be equal to the ratio of their 
> weights. This definition is pretty restrictive since it requires the 
> properties to hold for any thread in any interval, which is not 
> feasible. [...]

yes, it's a pretty strong definition, but also note that while it is 
definitely not easy to implement, the solution is nevertheless feasible 
in my opinion and there exists a scheduler that implements it: CFS.

	Ingo
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