From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265794AbUAKILL (ORCPT ); Sun, 11 Jan 2004 03:11:11 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265795AbUAKILL (ORCPT ); Sun, 11 Jan 2004 03:11:11 -0500 Received: from mail-06.iinet.net.au ([203.59.3.38]:42732 "HELO mail.iinet.net.au") by vger.kernel.org with SMTP id S265794AbUAKILG (ORCPT ); Sun, 11 Jan 2004 03:11:06 -0500 Message-ID: <001c01c3d824$cbf26ab0$0a01a8c0@mart> From: "Ashton Mills" To: Subject: Bug Report: Reduced disk performance in 2.6.1 Date: Sun, 11 Jan 2004 19:25:03 +1000 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Following the bug reporting guide at www.kernel.org. Sending to linux-kernel@vger.kernel.org because I don't know where the problem lies, I've eliminated two areas (detailed below). PROBLEM: Stock 2.6.1 kernel shows reduced disk performance compared to stock 2.6.0. DESCRIPTION: 2.6.0 -- hdparm -Tt shows: ~70 M/s for a single drive ~110 M/s for 2-drive software RAID 0 array 2.6.1 -- hdparm -Tt shows: ~60 M/s for single drive ~90 M/s for 2-drive software RAID 0 array Kernel configuration file the same -- used .config from 2.6.0 with make oldconfig Reproducible: yes. Results remain consistent between the two kernels. This is the only change to the system. No other software or hardware was changed, just a straight kernel upgrade. Relevant specs: Athlon-XP 2800+ 1024M RAM Adaptec 29160 Two Maxtor 10k RPM U160 SCSI drives in md software RAID 0 array Linux version 2.6.1 (root@Agamemnon) (gcc version 3.3.2 20031218 (Gentoo Linux 3.3.2-r5, propolice-3.3-7)) PROGRESS: Patched 2.6.1 with the 2.6.0 aic7xxx SCSI driver in case it was a result of the new .36 version of the driver. Result: problem remains Patched 2.6.1 with the 2.6.0 md driver, since that was also shown to be updated in 2.6.1 Result: problem remains So, it doesn't appear to be a SCSI or md driver issue. Don't know where to go from here, reporting as bug.