From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261493AbTDDX6h (for ); Fri, 4 Apr 2003 18:58:37 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261489AbTDDX6g (for ); Fri, 4 Apr 2003 18:58:36 -0500 Received: from amsfep15-int.chello.nl ([213.46.243.28]:41309 "EHLO amsfep15-int.chello.nl") by vger.kernel.org with ESMTP id S261474AbTDDX6c (for ); Fri, 4 Apr 2003 18:58:32 -0500 Message-ID: <036201c2fb07$b41b8340$2e77c23e@pentium4> From: "Jonathan Vardy" To: , References: <73300040777B0F44B8CE29C87A0782E101FA98FB@exchange.explainerdc.com> Subject: Re: RAID 5 performance problems Date: Sat, 5 Apr 2003 02:10:02 +0200 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 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org RE: RAID 5 performance problems> I've rebooted with the original Red Hat kernel (2.4.20) and it > recognizes the drives correctly now (UDMA100) but the performance is > still poor Good news; I've finally got the performance up to a good level. Bonnie++ now gives 77MB/sec read and 25MB/sec write speeds. The problem was being caused by a setting in the mainbaord BIOS; "PCI latency timer" had a default value of 0, after changing this to 32 the drive speed (hdparm) doubled and the raid finally performed as it should. I'd like to thank everybody who responded for giving me advice on the problem, I apreciate it greatly. Yours sincerely, Jonathan Vardy