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

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Message-ID: <20070425093228.GC498@elte.hu>
Date:	Wed, 25 Apr 2007 11:32:28 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	ray-gmail@...rabbit.org
Cc:	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>,
	William Lee Irwin III <wli@...omorphy.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


* Ray Lee <madrabbit@...il.com> wrote:

> It would seem like there should be a penalty associated with sending 
> those points as well, so that two processes communicating quickly with 
> each other won't get into a mutual love-fest that'll capture the 
> scheduler's attention.

it's not really "points", but "nanoseconds you are allowed to execute on 
the CPU". And thus two processes communicating with each other quickly 
and sending around this resource does get the attention of CFS: the 
resource is gradually consumed because the two processes are running on 
the CPU while they are communicating with each other. So it all works 
out fine.

	Ingo
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