From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 17 Apr 2002 12:36:37 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 17 Apr 2002 12:36:36 -0400 Received: from h24-67-14-151.cg.shawcable.net ([24.67.14.151]:7931 "EHLO webber.adilger.int") by vger.kernel.org with ESMTP id ; Wed, 17 Apr 2002 12:36:36 -0400 From: Andreas Dilger Date: Wed, 17 Apr 2002 10:34:53 -0600 To: Moritz Franosch Cc: linux-kernel@vger.kernel.org Subject: Re: IO performance problems in 2.4.19-pre5 when writing to DVD-RAM/ZIP/MO Message-ID: <20020417163453.GM20464@turbolinux.com> Mail-Followup-To: Moritz Franosch , linux-kernel@vger.kernel.org In-Reply-To: <20020416165358.E29747@dualathlon.random> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.3.27i X-GPG-Key: 1024D/0D35BED6 X-GPG-Fingerprint: 7A37 5D79 BF1B CECA D44F 8A29 A488 39F5 0D35 BED6 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Apr 17, 2002 17:26 +0200, Moritz Franosch wrote: > In cases 9 and 12 where performance is bad, both tested drives are on > the same IDE controller. Should that matter? Yes, very much. IDE is broken in this regard - you can only do I/O to one device on the IDE channel at the same time. Either you need to get additional IDE controllers (about $35 or so) or you split your devices so that they are on separate IDE channels (i.e. DVD and ZIP together, HD on the other channel if copying HD <-> DVD and HD <-> ZIP). Of course with 2 HDs, you should probably keep them on separate channels also. Cheers, Andreas -- Andreas Dilger http://www-mddsp.enel.ucalgary.ca/People/adilger/ http://sourceforge.net/projects/ext2resize/