From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Tue, 11 Dec 2001 02:57:36 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Tue, 11 Dec 2001 02:57:26 -0500 Received: from [12.234.19.19] ([12.234.19.19]:34828 "HELO ocean.lucon.org") by vger.kernel.org with SMTP id ; Tue, 11 Dec 2001 02:57:11 -0500 Date: Mon, 10 Dec 2001 23:57:08 -0800 From: "H . J . Lu" To: Linux 1394 Cc: linux kernel Subject: Re: Slow Disk I/O with QPS M3 80GB HD Message-ID: <20011210235708.A17743@lucon.org> In-Reply-To: <20011210203452.A3250@lucon.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <20011210203452.A3250@lucon.org>; from hjl@lucon.org on Mon, Dec 10, 2001 at 08:34:52PM -0800 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Dec 10, 2001 at 08:34:52PM -0800, H . J . Lu wrote: > I have a very strange problem. The disk I/O of my QPS M3 80GB HD is > very slow under 2.4.10 and above. I got like 1.77 MB/s from hdparm. > But under 2.4.9, I got 14 MB/s on the same hardware. A 30GB HD has > consistent I/O performance under 2.4.9 and above on the same bus. Has > anyone else seen this? Does anyone have a large (>= 80GB) 1394 HD? > I did a binary search. 2.4.10-pre10 is the last good kernel. I got # hdparm -t /dev/sda /dev/sda: Timing buffered disk reads: 64 MB in 4.40 seconds = 14.55 MB/sec Even since 2.4.10-pre11 up to 2.4.16, I got about 1.77 MB/sec on the same hardware. However, I don't have problems with 80GB IDE HD. Has anyone seen I/O problems on large (>= 80GB) SCSI HD or HD with SCSI emulation? H.J.