From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 27 Sep 2001 18:09:41 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 27 Sep 2001 18:09:32 -0400 Received: from pop.gmx.net ([213.165.64.20]:44199 "HELO mail.gmx.net") by vger.kernel.org with SMTP id ; Thu, 27 Sep 2001 18:09:14 -0400 Date: Fri, 28 Sep 2001 00:07:07 +0200 From: Christian Ohm To: linux-kernel@vger.kernel.org Subject: sound slowdown when accessing ide cdrom Message-ID: <20010928000707.A30994@thevoid.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.3.22i Organization: theVoid X-Operating-System: Linux moongate 2.4.9 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org 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.