From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965274AbWFAGgw (ORCPT ); Thu, 1 Jun 2006 02:36:52 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965247AbWFAGgw (ORCPT ); Thu, 1 Jun 2006 02:36:52 -0400 Received: from pne-smtpout2-sn1.fre.skanova.net ([81.228.11.159]:8862 "EHLO pne-smtpout2-sn1.fre.skanova.net") by vger.kernel.org with ESMTP id S965274AbWFAGgv (ORCPT ); Thu, 1 Jun 2006 02:36:51 -0400 Date: Thu, 1 Jun 2006 08:35:39 +0200 From: Voluspa To: Fengguang Wu Cc: Valdis.Kletnieks@vt.edu, diegocg@gmail.com, linux-kernel@vger.kernel.org Subject: Re: Adaptive Readahead V14 - statistics question... Message-Id: <20060601083539.5b783e6e.lista1@comhem.se> In-Reply-To: <349141076.14929@ustc.edu.cn> References: <20060530053631.57899084.lista1@comhem.se> <200605301649.k4UGnooZ004266@turing-police.cc.vt.edu> <20060531235021.41a58425.lista1@comhem.se> <349141076.14929@ustc.edu.cn> X-Mailer: Sylpheed version 1.0.4 (GTK+ 1.2.10; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 1 Jun 2006 13:51:43 +0800 Fengguang Wu wrote: > On Wed, May 31, 2006 at 11:50:21PM +0200, Voluspa wrote: > > _Massive READ_ > > > > [/usr had some 490000 files] > > > > "cd /usr ; time find . -type f -exec md5sum {} \;" > > > > 2.6.17-rc5 ------- 2.6.17-rc5-ar > > > > real 21m21.009s -- 21m37.663s > > user 3m20.784s -- 3m20.701s > > sys 6m34.261s -- 6m41.735s > > > > I had planned to run this at least three times, but didn't realize I had > > 12 compiled kernel trees and 3 uncompiled there... So, a one-shot had to > > do. But it's still significant. > > Sorry, it is a known regression. I'd like to fix it in the next > release. That's cool. I had fun testing (I'm weird) and now have a fixed procedure to monitor your future work. When/if it hits mainline I'll both back it out and switch it on/off. Then shout WOLF if I see a regression anywhere ;) There's still the readahead size to adjust. I'll return with my findings. Mvh Mats Johannesson --