From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263799AbUEXB2o (ORCPT ); Sun, 23 May 2004 21:28:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263802AbUEXB2o (ORCPT ); Sun, 23 May 2004 21:28:44 -0400 Received: from holomorphy.com ([207.189.100.168]:17542 "EHLO holomorphy.com") by vger.kernel.org with ESMTP id S263799AbUEXB2n (ORCPT ); Sun, 23 May 2004 21:28:43 -0400 Date: Sun, 23 May 2004 18:28:28 -0700 From: William Lee Irwin III To: Jakob Oestergaard , Phy Prabab , linux-kernel@vger.kernel.org Subject: Re: Help understanding slow down Message-ID: <20040524012828.GK1833@holomorphy.com> Mail-Followup-To: William Lee Irwin III , Jakob Oestergaard , Phy Prabab , linux-kernel@vger.kernel.org References: <20040524003200.14639.qmail@web90007.mail.scd.yahoo.com> <20040524005751.62303.qmail@web90006.mail.scd.yahoo.com> <20040524010455.GJ1833@holomorphy.com> <20040524012553.GG30687@unthought.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20040524012553.GG30687@unthought.net> User-Agent: Mutt/1.5.5.1+cvs20040105i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, May 24, 2004 at 03:25:53AM +0200, Jakob Oestergaard wrote: > Eh, not if I read the numbers right: > 2.6.7-p1: 24.86user 51.77system 2:58.87elapsed 42%CPU > 24.86 + 51.77 = 76.63 seconds on CPU, 102.24 seconds of waiting > 2.4.21: 28.68user 34.98system 1:12.34elapsed 87%CPU > 28.68 + 34.98 = 63.66 seconds on CPU, 8.68 seconds of waiting > So, 2.6.7-p1 spends 16.79 seconds more in the kernel as you observed, > but it spends 93.56 seconds more waiting for I/O (or whatever). > Unless I'm totally missing something, the wait seems to be the > regression. I'm sorry, you're right. Let's start by looking into IO activity. Phy, could you log the output of vmstat(1) during the runs? -- wli