From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262538AbUBYAUz (ORCPT ); Tue, 24 Feb 2004 19:20:55 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262546AbUBYAUz (ORCPT ); Tue, 24 Feb 2004 19:20:55 -0500 Received: from fw.osdl.org ([65.172.181.6]:27026 "EHLO mail.osdl.org") by vger.kernel.org with ESMTP id S262538AbUBYAUx (ORCPT ); Tue, 24 Feb 2004 19:20:53 -0500 Date: Tue, 24 Feb 2004 16:20:52 -0800 From: cliff white To: linux-kernel@vger.kernel.org Cc: akpm@osdl.org Subject: reaim - 2.6.3-mm1 IO performance down. Message-Id: <20040224162052.33895550.cliffw@osdl.org> Organization: OSDL X-Mailer: Sylpheed version 0.9.6 (GTK+ 1.2.9; 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 Running the reaim 'new_fserver' workload, we now see a performance drop on 2.6.3-mm1, ext3 filesystem Kernel JPM Max Users Percent change inux-2.6.3 10347.87 172 0.0 2.6.3-rc3-mm1 9826.35 164 -5.07 2.6.3-mm1 8938.17 140 (run 1) -13.65 2.6.3-mm1 9100.39 136 (run 2)-12.08 I have done some comparions graphs here, with readprofile data: http://developer.osdl.org/cliffw/reaim/compares/r_comp/2.6.3_vs_mm1_r1/index.html http://developer.osdl.org/cliffw/reaim/compares/r_comp/2.6.3_vs_mm1_r2/index.html The interesting graph is the bottom one on the page, comparing client run-time to number of children. The -mm1 kernel has a spike in run time, becoming very noticealbe around 60-80 lusers. kernel Users JPM Run Time linux-2.6.3 60 10327.87 34.16 seconds 2.6.3-mm1 60 8279.75 42.61 seconds Linux-2.6.3 80 10275.23 45.78 seconds 2.6.3-mm1 80 7841.31 59.99 seconds For the same test on the same machine, results from 2.6.2-rc1-mm2 and 2.6.2-rc3-mm1 were within 1.0% of the linux-2.6.2 runs. So this is new. More data and tests if requested - are there some patch sets we should try reverting? cliffw -- The church is near, but the road is icy. The bar is far, but i will walk carefully. - Russian proverb