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Date: Fri, 27 Apr 2007 15:41:00 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Kasper Sandberg <lkml@metanurb.dk>, Gene Heskett <gene.heskett@gmail.com>,
       linux-kernel@vger.kernel.org,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Con Kolivas <kernel@kolivas.org>, Nick Piggin <npiggin@suse.de>,
       Mike Galbraith <efault@gmx.de>, Arjan van de Ven <arjan@infradead.org>,
       Peter Williams <pwil3058@bigpond.net.au>, caglar@pardus.org.tr,
       Willy Tarreau <w@1wt.eu>, Mark Lord <lkml@rtr.ca>,
       Zach Carter <linux@zachcarter.com>, buddabrod <buddabrod@gmail.com>
Subject: Re: [patch] CFS scheduler, -v6
Message-ID: <20070427134100.GA26050@elte.hu>
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* Thomas Gleixner <tglx@linutronix.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