linux-kernel - Re: [patch] CFS scheduler, -v6

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Message-ID: <20070427115526.GA7699@elte.hu>
Date:	Fri, 27 Apr 2007 13:55:26 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Kasper Sandberg <lkml@...anurb.dk>
Cc:	Gene Heskett <gene.heskett@...il.com>,
	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>, 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,
	Willy Tarreau <w@....eu>, Mark Lord <lkml@....ca>,
	Zach Carter <linux@...hcarter.com>,
	buddabrod <buddabrod@...il.com>
Subject: Re: [patch] CFS scheduler, -v6


* Ingo Molnar <mingo@...e.hu> wrote:

> update for lkml readers: this is some really 'catastrophic' condition 
> triggering on your box. Here ogg123 just never skips on an older 750 
> MHz box, which is 4-5 times slower than your 2GHz box - while i have 
> _fourty nice-0 infinite loops_ running. I.e. at this clearly 
> ridiculous load, at just 2.5% of CPU time ogg123 is just chugging 
> along nicely and never leaves out a beat.

Kasper, just to exclude the possibility that this is somehow related to 
IO scheduling, could you copy the OGG file over to /dev/shm and play it 
from there? Do you still get the bad skips?

	Ingo
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