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

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Date:	Tue, 22 Dec 2009 16:15:57 +0100
From:	Éric Piel <eric.piel@...mplin-utc.net>
To:	Takashi Iwai <tiwai@...e.de>
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

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 .

:
> 
> I'd try first only sound/pci/hda/* files.
Ok, I'll try later. Or maybe I'll just do a bisection...

Eric



View attachment ".config" of type "text/plain" (82691 bytes)