From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265710AbUBPRqF (ORCPT ); Mon, 16 Feb 2004 12:46:05 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265713AbUBPRqE (ORCPT ); Mon, 16 Feb 2004 12:46:04 -0500 Received: from kinesis.swishmail.com ([209.10.110.86]:7689 "EHLO kinesis.swishmail.com") by vger.kernel.org with ESMTP id S265710AbUBPRqA (ORCPT ); Mon, 16 Feb 2004 12:46:00 -0500 Message-ID: <403103A2.1040709@techsource.com> Date: Mon, 16 Feb 2004 12:53:38 -0500 From: Timothy Miller MIME-Version: 1.0 To: Walt H CC: linux-kernel@vger.kernel.org Subject: Re: File system performance, hardware performance, ext3, 3ware RAID1, etc. References: <200402141016.51205.waltabbyh@comcast.net> In-Reply-To: <200402141016.51205.waltabbyh@comcast.net> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Walt H wrote: > On Thu, Feb 12, 2004 at 06:32:31PM -0500, Timothy Miller wrote: > > >>For writes, iozone found an upper bound of about 10megs/sec, which is >>abysmal. Typically, I'd expect writes to be faster (on a single drive) >>than reads, because once the write is sent, you can forget about it. >>You don't have to wait around for something to come back, and that >>latency for reads can hurt performance. The OS can also buffer writes >>and reorder them in order to improve efficiency. > > > I'm joining this thread rather late, so perhaps I missed something. What > hardware is the test being ran on? I have an AMD MPX based setup which > suffers from a chipset bug which effectively limits writes to ~25MB/sec to > devices connected via the 768 southbridge. Maybe something similar with your > hardware? Athlon 2800+ Via KT400 chipset (ABIT KD7, I believe) WD1200JB (Western Digital 120gb) 3ware 7000-2 as RAID1 Latest Red Hat 2.4.20-?? kernel My wife's computer has the ABIT board with the KT333 and the same drive, but not RAID. SiSoft SANDRA reports 39 megs/sec for writes to an NTFS volume. Right now, I'm thinking the bottleneck may be the 3ware.