From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263895AbTLUTTJ (ORCPT ); Sun, 21 Dec 2003 14:19:09 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263904AbTLUTTJ (ORCPT ); Sun, 21 Dec 2003 14:19:09 -0500 Received: from bristol.phunnypharm.org ([65.207.35.130]:57267 "EHLO bristol.phunnypharm.org") by vger.kernel.org with ESMTP id S263895AbTLUTTF (ORCPT ); Sun, 21 Dec 2003 14:19:05 -0500 Date: Sun, 21 Dec 2003 13:48:40 -0500 From: Ben Collins To: M?ns Rullg?rd Cc: linux-kernel@vger.kernel.org Subject: Re: Firewire/sbp2 troubles with Linux 2.6.0 Message-ID: <20031221184840.GR6607@phunnypharm.org> References: <20031221035348.GM6607@phunnypharm.org> <20031221144813.GN6607@phunnypharm.org> <20031221183132.GP6607@phunnypharm.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.4i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org > > I'm guessing that your card doesn't like getting some many commands at > > once. It's possible that your sbp2 device itself cannot handle it > > (generally, I've found it to be caused by the card though). > > Is it possible to set the limit somewhere between the default and > complete serialization? Shouldn't it be possible to detect such > things automatically, somehow? Things are attempted to be detected, but somehow that only works 95% of the time. I'd blame bad sbp2 devices, but I don't have anything to back that up. You can look in sbp2.c to see where it sets the max commands. > > As far as 10mbs, you have to remember that even though firewire is much > > higher than that, your drive is still an IDE, and the firewire is still > > going through an IDE bridge. So the limitation lies in the IDE bridge. > > I've seen performance as high as 34MB/s with good IDE bridges and > > drives, though. > > The disks will easily do 40 MB/s on a good IDE controller. It seems > like a rather bad bridge to me if it has that much overhead. I > haven't seen many different options for sale, either. Most things based on newer Oxford chips seem to work pretty well. What ohci1394 controller do you have though? -- Debian - http://www.debian.org/ Linux 1394 - http://www.linux1394.org/ Subversion - http://subversion.tigris.org/ WatchGuard - http://www.watchguard.com/