Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 29 Nov 2001 18:37:50 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 29 Nov 2001 18:37:40 -0500 Received: from mail.myrio.com ([63.109.146.2]:15858 "HELO smtp1.myrio.com") by vger.kernel.org with SMTP id convert rfc822-to-8bit; Thu, 29 Nov 2001 18:37:28 -0500 Message-ID: From: Torrey Hoffman To: "'Rene Rebe'" Cc: linux-kernel@vger.kernel.org, reiserfs-list@namesys.com Subject: RE: [reiserfs-list] ReiserFS on RAID5 Linux-2.4 - speed problem Date: Thu, 29 Nov 2001 15:36:48 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2650.21) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Ren? Rebe wrote: > Have you tryed: > > echo 1023 > /proc/sys/vm/max-readahead [...] Well, I gave that a try. note: /dev/md0 is a 180 GB reiserfs on software RAID 5. /dev/hda9 is an 18 GB reiserfs on a normal partition. System is a dual PIII-800 with 512 MB RAM. Kernel is 2.4.16 + Andrew Morton's Low Latency and I/O scheduling patches. before: cat /proc/sys/vm/max-readahead: 31 dbench 32 on /dev/md0 : 8.11 MB/sec dbench 32 on /dev/hda9 : 24.85 MB/sec after: echo 1023 > /proc/sys/vm/max-readahead dbench 32 on /dev/md0 : 8.047 MB/sec dbench 32 on /dev/hda9 : 24.65 MB/sec So that change actually made things a little worse, at least on this kernel. :-( Torrey - 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/