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

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Date:	Fri, 27 Apr 2007 13:53:44 +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

* Kasper Sandberg <lkml@...anurb.dk> wrote:

> > Compared to mainline?  I still think this is a 100% keeper for 
> > desktop users like me.
> 
> Here its alot worse, just playing an ogg with ogg123 even without 
> anything reniced (X is 0), just pressing a link in konqueror can make 
> audio skip (ogg123 fails to fill the alsa buffer, and thus it skips).

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.

i'll try to figure out what is happening on your box. I asked for your 
.config off-list (which you already sent me) and i'll try to reproduce 
your problems. One thing i noticed: when ogg123 plays with 'esd' also 
running on the system, it starts skipping really badly - but it does so 
under all schedulers i tried (cfs, sd, vanilla).

	Ingo
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