From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261552AbTLPMvI (ORCPT ); Tue, 16 Dec 2003 07:51:08 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261575AbTLPMvI (ORCPT ); Tue, 16 Dec 2003 07:51:08 -0500 Received: from web13903.mail.yahoo.com ([216.136.175.29]:1124 "HELO web13903.mail.yahoo.com") by vger.kernel.org with SMTP id S261552AbTLPMvG (ORCPT ); Tue, 16 Dec 2003 07:51:06 -0500 Message-ID: <20031216125103.6301.qmail@web13903.mail.yahoo.com> X-RocketYMMF: knobi.rm Date: Tue, 16 Dec 2003 04:51:03 -0800 (PST) From: Martin Knoblauch Reply-To: knobi@knobisoft.de Subject: Re: RAID-0 read perf. decrease after 2.4.20 To: linux-kernel@vger.kernel.org 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 On Monday 08 December 2003 13:47, Marcelo Tosatti wrote: Hi Marcelo, > 2.4.20-aa included rmap and some VM modifications most notably > "drop_behind()" logic which I believe should be the reason for the huge > read speedups. Can you please try it? Against 2.4.23. Just some feedback: echo 511 > /proc/sys/vm/max-readahead brings back the read performance of my 30 disks on 4 controller LVM/RAID0. Cheers Martin ===== ------------------------------------------------------ Martin Knoblauch email: k n o b i AT knobisoft DOT de www: http://www.knobisoft.de