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

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Date:	Tue, 22 Dec 2009 16:40:37 +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 16:15:57 +0100,
Éric Piel wrote:
> 
> Op 22-12-09 10:17, Takashi Iwai schreef:
> :
> >>> 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
> Just tried: it doesn't have any effect, as enable_msi=0. Still 25% of
> the CPU used, as before.
> $ cat bdl_pos_adj
> 0,-1,-1,-1,-1,-1,-1,-1
> 
> Could it be coming from the beeper? Also, just in case it can help,
> attached is my .config .

Do you have multiple HD-audio devices?  See /proc/asound/cards.
If there are multiple, you need to pass a value for each.


Takashi
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