linux-kernel - Re: [patch] CFS (Completely Fair Scheduler), v2

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Date:	Tue, 17 Apr 2007 07:51:09 +0200
From:	Mike Galbraith <efault@....de>
To:	Willy Tarreau <w@....eu>
Cc:	Gene Heskett <gene.heskett@...il.com>, Ingo Molnar <mingo@...e.hu>,
	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,
	Dmitry Adamushko <dmitry.adamushko@...il.com>
Subject: Re: [patch] CFS (Completely Fair Scheduler), v2

On Tue, 2007-04-17 at 07:25 +0200, Willy Tarreau wrote:

> Have you tried previous version with the fair-fork patch ? It might be possible
> that your workload is sensible to the fork()'s child getting much CPU upon
> startup.

Dunno about that, but here's a possibly related datapoint.  I reported
to Ingo yesterday that I was sometimes losing control of my GUI (KDE)
under heavy IO.  I just reproduced it in mainline rc7.  If I start a
bonnie, and click around popping windows to the foreground, then poke
KDE's menu button, I may lose all GUI capability for a _very_ long time.
Here, with bonnie, that means until it gets past writing with putc, and
moves on to rewrite.  Ages.

	-Mike

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