Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sun, 16 Dec 2001 06:44:58 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sun, 16 Dec 2001 06:44:50 -0500 Received: from maile.telia.com ([194.22.190.16]:10206 "EHLO maile.telia.com") by vger.kernel.org with ESMTP id ; Sun, 16 Dec 2001 06:44:43 -0500 Date: Sun, 16 Dec 2001 12:44:36 +0100 (MET) From: Jurij Smakov X-X-Sender: jurij@bobcat To: linux-kernel@vger.kernel.org cc: hahn@physics.mcmaster.ca Subject: Re: PDC20265 IDE controller trouble Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 15 Dec 2001 13:15:57 -0500 (EST) Mark Hahn wrote: > can you replicate this with benchmarks more sane than hdparm > (like build a raid0, and run bonnie or iozone on an ext2 on it?) Here are the bonnie results on a RAID0 in my setup (kernel 2.4.17-pre8, raidtools 0.9.0, PDC20265 controller on Asus TUSL2 motherboard, 2 IBM 60GB disks, one disk per channel). /etc/raidtab contains: raiddev /dev/md0 raid-level 0 nr-raid-disks 2 persistent-superblock 1 chunk-size 4 device /dev/hde raid-disk 0 device /dev/hdg raid-disk 1 mkraid /dev/md0 mke2fs /dev/md0 mount /dev/md0 /backup bonnie -d /backup -n 1 -s 1024k -u0 Version 1.02 ------Sequential Output------ --Sequential Input- --Random- -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP 1G 2338 16 2442 1 2135 1 7674 54 75023 28 236.7 0 ^^^^ As one can see, the results of writing time are RIDICULOUSLY low (2.4 MB/sec), while reading is ok. For comparison, result of bonnie on a separate disk, used in the array: mke2fs /dev/hde mount /dev/hde /hde bonnie -d /hde -n 1 -s 1024k -u0 Version 1.02 ------Sequential Output------ --Sequential Input- --Random- -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP 1G 11127 79 35617 21 16186 12 12969 93 39762 13 225.0 0 The results for the second disk look similarly. Best regards, Jurij. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/