linux-kernel - Re: Audio skipping with 2.6.24.4 and 2.6.25-rc9

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Date:	Sat, 12 Apr 2008 16:19:14 -0300
From:	"Carlos R. Mafra" <crmafra2@...il.com>
To:	Frederik Himpe <fhimpe@...enet.be>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Audio skipping with 2.6.24.4 and 2.6.25-rc9

On Sat 12.Apr'08 at 16:13:01 +0000, Frederik Himpe wrote:
> I'm experiencing a lot of problems with audio skipping on my system. I am 
> using Rhythmbox as an audio player and have Compiz active. Whenever I 
> maximise or restore a maximised real transparent gnome-terminal, audio 
> skips. Compared to other normal applications, restoring the transparent 
> console is also slow (it takes a few seconds before the window appears).
> 
> I ran cfs-debug-info-clear.sh, and the reproduced the problem 3 times by 
> restoring and minimising a gnome-terminal window. After that I ran cfs-
> debug-info.sh, and I uploaded the information here: 
> http://artipc10.vub.ac.be/cfs-debug-info-2008.04.12-18.00.20.gz
> 
> This problem happens with both 2.6.24.4 as with 2.6.25-rc9 (the debugging 
> information is from the latter version).

I once learned ( http://lkml.org/lkml/2008/2/29/179 )
that the CFS would have something to do with the latencies I was
observing in my system if se.wait_max was bigger than 40 msecs.
It would be an "anomaly" in CFS.

But in the log you uploaded you have only two se.wait_max greater than
40 msecs

[mafra@...alhost:~]$ grep se.wait_max cfs-debug-info-2008.04.12-18.00.20 |awk '{ {if ($3 > 40.000000) print $3} }'
44.153039
50.841370

As these numbers are only a bit greater than 40, I guess your problem is not
related to the CFS scheduler.

Can you try latencytop? ( www.latencytop.org )

Bye,
Carlos
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