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

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Message-ID: <20070427134100.GA26050@elte.hu>
Date:	Fri, 27 Apr 2007 15:41:00 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Kasper Sandberg <lkml@...anurb.dk>,
	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>, 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


* Thomas Gleixner <tglx@...utronix.de> wrote:

> > 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?
> 
> That's what I can observe here:
> 
> ogg123 local harddisk	skips
> ogg123 nfs		works
> ogg123 /dev/shm		works
> 
> The skips when running from the local harddisk are definitely caused 
> by the I/O scheduler or some other bottleneck in the 
> block/disk/scsi/sata jungle. I try to find out more details.

and is it independent of the scheduler - i.e. can you see this skipping 
on vanilla too?

	Ingo
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