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SubjectRE: sound slowdown when accessing ide cdrom
Date
I've been getting this in both win2k and linux using several different
cdrom drives on an abit kt7a-raid (via kt133a) and a soundblaster awe64
isa card. Looks like the kt133 puts ide performance over isa?
I didn't have this feature on my abit bp6 (intel 440bx).

/Peter


-----Original Message-----
From: linux-kernel-owner@vger.kernel.org
[mailto:linux-kernel-owner@vger.kernel.org]On Behalf Of Christian Ohm
Sent: den 28 september 2001 00:07
To: linux-kernel@vger.kernel.org
Subject: sound slowdown when accessing ide cdrom



hi.

i'm using an old ide cdrom drive and a soundblaster awe64 isa pnp sound card
(using the alsa-driver). when i'm accessing the cdrom, the sound playback
slows down. a little and irregularly when copying files, more and almost
constant (about 10%) when grabbing audio using cdparanoia. it works perfect
when using the scsi cdrom drive.

i'm using an nmc 8tax+ (via kt133) mainboard with duron700 and 512mb ram,
one isa slot with the soundblaster awe64 pnp, a dawicontrol dc2975u scsi
controller (symbios logic 53c875), a matrox g400, a sis900 ethernet
controller. the ide cdrom drive is an old 4x speed drive
(/proc/ide/ide1/hdc/model says 'MATSHITA CR-581') connected to the second
ide port (without slave). i'm using kernel 2.4.9 and the oss emulation of
alsa (debian unstable packages 0.9+0beta7-1). i also tested this with the
low latency patch (which didn't change anything).

anyone knows what happens there? it seems like there's some strange
interaction of the ide cdrom driver and a timer used by (at least) alsa.

if there's some info missing i'd be happy to provide it.

bye
christian ohm

ps: since i'm not subscribed to this list, please cc all replies to me
(chr.ohm@gmx.net). thanks.
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