From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263800AbTL3B1Z (ORCPT ); Mon, 29 Dec 2003 20:27:25 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264141AbTL3B1Y (ORCPT ); Mon, 29 Dec 2003 20:27:24 -0500 Received: from [24.35.117.106] ([24.35.117.106]:63370 "EHLO localhost.localdomain") by vger.kernel.org with ESMTP id S263800AbTL3B1W (ORCPT ); Mon, 29 Dec 2003 20:27:22 -0500 Date: Mon, 29 Dec 2003 20:27:21 -0500 (EST) From: Thomas Molina X-X-Sender: tmolina@localhost.localdomain To: Kernel Mailing List Subject: Re: 2.6.0 performance problems In-Reply-To: Message-ID: References: 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 On Mon, 29 Dec 2003, Thomas Molina wrote: > 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 A suggestion was made that readahead might make a difference. Changing readahead under 2.4 from default of 8 to 255 the times went to: real 13m50.198s user 0m33.780s sys 0m15.390s > 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 Changing 2.6 to 8 from 255 changed times: real 25m39.653s user 0m37.594s sys 0m55.454s I'll try the suggestion of 8192 for 2.6 later. hdparm won't let me set readahead more than 255 for 2.4. I'm currently recompiling for profiling support. I'm ashamed to say that wasn't configured in. Linus, once I get that finished and do some testing I'll post results.