linux-kernel - Re: [patch] CFS scheduler, -v8

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Date:	Wed, 02 May 2007 09:59:54 +0200
From:	Mike Galbraith <efault@....de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Con Kolivas <kernel@...ivas.org>,
	Nick Piggin <npiggin@...e.de>,
	Arjan van de Ven <arjan@...radead.org>,
	Peter Williams <pwil3058@...pond.net.au>,
	Thomas Gleixner <tglx@...utronix.de>, caglar@...dus.org.tr,
	Willy Tarreau <w@....eu>,
	Gene Heskett <gene.heskett@...il.com>, Mark Lord <lkml@....ca>,
	Zach Carter <linux@...hcarter.com>,
	buddabrod <buddabrod@...il.com>, Balbir Singh <balbir@...ibm.com>
Subject: Re: [patch] CFS scheduler, -v8

On Tue, 2007-05-01 at 23:22 +0200, Ingo Molnar wrote:
>  - interactivity: precise load calculation and load smoothing

This seems to help quite a bit.

(5 second top sample)

 2636 root      15  -5 19148  15m 5324 R   73  1.5   1:42.29 0 amarok_libvisua
 5440 root      20   0  320m  36m 8388 S   18  3.6   3:28.55 1 Xorg
 4621 root      20   0 22776  18m 4168 R   12  1.8   0:00.63 1 cc1
 4616 root      20   0 19456  13m 2200 R    9  1.3   0:00.43 0 cc1

I no longer have to renice both X and Gforce to achieve a perfect
display when they are sharing my box with a make -j2.  X is displaying
everything it's being fed beautifully with no help.  I have to renice
Gforce (amarok_libvisual), but given it's very heavy CPU usage, that
seems perfectly fine.

No regressions noticed so far.  Box is _very_ responsive under load,
seemingly even more so than with previous releases.  That is purely
subjective, but the first impression was very distinct.

	-Mike

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