Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262591AbTKYNip (ORCPT ); Tue, 25 Nov 2003 08:38:45 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262592AbTKYNio (ORCPT ); Tue, 25 Nov 2003 08:38:44 -0500 Received: from mail.it.helsinki.fi ([128.214.205.39]:29085 "EHLO mail.it.helsinki.fi") by vger.kernel.org with ESMTP id S262591AbTKYNim (ORCPT ); Tue, 25 Nov 2003 08:38:42 -0500 Date: Tue, 25 Nov 2003 15:38:37 +0200 (EET) From: Mikael Johansson X-X-Sender: mpjohans@soul.helsinki.fi To: Joshua Schmidlkofer cc: Linux Kernel Mailing List Subject: Superior disk perf. of 2.4.20-ac (Was: RAID-0 read perf. decrease after 2.4.20) In-Reply-To: <1069736477.1552.11.camel@menion.home> Message-ID: References: <20031124100534.24941.qmail@web13902.mail.yahoo.com> <1069736477.1552.11.camel@menion.home> 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 Content-Length: 1400 Lines: 41 Hell Joshua and All! On Mon, 24 Nov 2003, Joshua Schmidlkofer wrote: > > >Has anyone else experienced a drastic drop in read performance on > > >software > > >RAID-0 with post 2.4.20 kernels? We have a few Athlon XP's here at our > And this isn't the read-ahead size change thing? When did this change take place? It would be easy to test then. I did some more tests on the weekend and found that this isn't RAID related; also normal single disk access is much faster on the 2.4.20-ac's than on other recent kernels. Just to summarise, the disk speed on one of the Athlon XP's (2GHz, 1.5 GB RAM, 2*160 GB Maxtor 6Y080L0) according to bonnie++: RAID-0 VIA write read 2.4.19 none 10,000 9,000 2.4.20 3.35 73,000 88,000 2.4.20-ac1 3.35-ac 70,000 135,000 2.4.20-ac2 3.35-ac 71,000 140,000 2.4.21-pre1 3.35-ac 71,000 79,000 2.4.21-pre3 3.35-ac 71,000 79,000 2.4.23-rc3 3.37 65,000 82,000 single disk 2.4.20-ac2 3.35-ac 55,000 74,000 2.4.23-rc3 3.37 54,000 48,000 So the single disk read performance of 2.4.20-ac2 is as fast as a double RAID-0 array of other kernels. Have a nice day, Mikael J. http://www.helsinki.fi/~mpjohans/ - 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/