linux-kernel - Re: [2.6.33-rc1] [SOUND] HDA: high cpu usage, noise

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Date:	Tue, 22 Dec 2009 10:17:25 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Éric Piel <eric.piel@...mplin-utc.net>
Cc:	Maciej Rutecki <maciej.rutecki@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	alsa-devel@...a-project.org, perex@...ex.cz,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [2.6.33-rc1] [SOUND] HDA: high cpu usage, noise

At Tue, 22 Dec 2009 10:15:20 +0100,
Éric Piel wrote:
> 
> Op 22-12-09 08:04, Takashi Iwai schreef:
> > At Mon, 21 Dec 2009 20:08:34 +0100,
> > Éric Piel wrote:
> :
> >> Could it be coming from this timeout?
> > 
> > It shouldn't.  The polling mode doesn't give any behavioral change,
> > and the CPU usage can't be that high.
> > 
> > Try is to pass bdl_pos_adj=0 option.  This should reduce the CPU hog,
> > at least.  But it doesn't mean it's the right fix...
> I'll try
> 
> > 
> > Another thing to try is to replace the whole HD-audio stack with the
> > last working one (was it 2.6.32?), and check whether it works with
> > 2.6.32 core.
> Could you give more details on how to do this?
> Does it consist in taking the sound/ directory of 2.6.32 and copying it
> over 2.6.33-rc1 ? Or less files?

I'd try first only sound/pci/hda/* files.


Takashi
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