From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265119AbTL2WH4 (ORCPT ); Mon, 29 Dec 2003 17:07:56 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265126AbTL2WH4 (ORCPT ); Mon, 29 Dec 2003 17:07:56 -0500 Received: from [24.35.117.106] ([24.35.117.106]:37513 "EHLO localhost.localdomain") by vger.kernel.org with ESMTP id S265119AbTL2WHw (ORCPT ); Mon, 29 Dec 2003 17:07:52 -0500 Date: Mon, 29 Dec 2003 17:07:46 -0500 (EST) From: Thomas Molina X-X-Sender: tmolina@localhost.localdomain To: Kernel Mailing List Subject: 2.6.0 performance problems Message-ID: 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 spend almost all of my time using, testing, and hacking on development kernels. On my laptop I have noticed that things seemed to take an inordinate amount of time to complete. I've ascribed most of this to the fact that most of the systems I work on have decent system specifications while my laptop is a PIII 650 MHz processor. I just finished a couple of comparisons between 2.4 and 2.6 which seem to confirm my impressions. I understand that the comparison may not be apples to apples and my methods of testing may not be rigorous, but here it is. In contrast to some recent discussions on this list, this test is a "real world" test at which 2.6 comes off much worse than 2.4. The 2.4 kernel I used for this test is the standard RedHat kernel in Fedora Core 1, 2.4.22-1.2129.nptl. The 2.6 kernel is the latest bk pull from today. The test was doing a bk export from a freshly updated bk repository. The specific command was: bk export linux-2.5 linux-2.6-tm Under 2.4 top shows: user nice system irq softirq iowait idle 1.3 0 2.1 0 0 0 96.6 Execution time for the test was: real 13m33.482s user 0m33.540s sys 0m16.210s Under 2.6 top shows: user nice system irq softirq iowait idle 0.9 0 5.3 0.9 0.3 92.6 0 Execution time for the test was: real 22m42.397s user 0m37.753s sys 0m54.043s I've done no performance tweaking in either case. Both tests were done immediately after boot up with only the top program running in each case. I'm not sure what other data would be relevant here. Any thoughts from the group would be appreciated.