From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S275362AbTHMUDq (ORCPT ); Wed, 13 Aug 2003 16:03:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S275374AbTHMUDq (ORCPT ); Wed, 13 Aug 2003 16:03:46 -0400 Received: from e31.co.us.ibm.com ([32.97.110.129]:14780 "EHLO e31.co.us.ibm.com") by vger.kernel.org with ESMTP id S275369AbTHMUDn (ORCPT ); Wed, 13 Aug 2003 16:03:43 -0400 Date: Wed, 13 Aug 2003 14:06:41 -0700 (PDT) From: Ram Pai X-X-Sender: ram@localhost Reply-To: linuxram@us.ibm.com To: Suparna Bhattacharya cc: Andrew Morton , Badari Pulavarty , , Subject: Re: [PATCH][2.6-mm] Readahead issues and AIO read speedup In-Reply-To: <20030808135645.GA3430@in.ibm.com> Message-ID: Organization: IBM Linux Technology Center 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 I ran an Database workload on the test3-mm1 bits and got around 20% improvement. These bits have Suparna's readahead_patch. The number of 4k read requests sent to the driver reduced significantly by 95%. Effectively generating lesser number of larger-size read-requests. And the number of readahead-window-resets dropped down by 50%. FYI, Ram Pai On Fri, 8 Aug 2003, Suparna Bhattacharya wrote: > On Thu, Aug 07, 2003 at 01:58:19PM -0700, Andrew Morton wrote: > > Badari Pulavarty wrote: > > > > > > On Thursday 07 August 2003 10:39 am, Andrew Morton wrote: > > > > Badari Pulavarty wrote: > > > > > We should do readahead of actual pages required by the current > > > > > read would be correct solution. (like Suparna suggested). -- Ram Pai linuxram@us.ibm.com ----------------------------------