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

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Message-ID: <20070425201309.GA5646@1wt.eu>
Date:	Wed, 25 Apr 2007 22:13:09 +0200
From:	Willy Tarreau <w@....eu>
To:	William Lee Irwin III <wli@...omorphy.com>
Cc:	Ingo Molnar <mingo@...e.hu>, "Li, Tong N" <tong.n.li@...el.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>, 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

On Wed, Apr 25, 2007 at 04:58:40AM -0700, William Lee Irwin III wrote:

> Adjustments to the lag computation for for arrivals and departures
> during execution are among the missing pieces. Some algorithmic devices
> are also needed to account for the varying growth rates of lags of tasks
> waiting to run, which arise from differing priorities/weights.

that was the principle of my proposal of sorting tasks by expected completion
time and using +/- credit to compensate for too large/too short slice used.

Willy

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