Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751395AbWCWNVw (ORCPT ); Thu, 23 Mar 2006 08:21:52 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751447AbWCWNVw (ORCPT ); Thu, 23 Mar 2006 08:21:52 -0500 Received: from rune.pobox.com ([208.210.124.79]:35236 "EHLO rune.pobox.com") by vger.kernel.org with ESMTP id S1751395AbWCWNVv (ORCPT ); Thu, 23 Mar 2006 08:21:51 -0500 Date: Thu, 23 Mar 2006 07:21:41 -0600 From: Rodney Gordon II To: Wu Fengguang , Con Kolivas , linux list , ck list Subject: Re: [ck] 2.6.16-ck1 Message-ID: <20060323132141.GA12508@spherenet.spherevision.org> Mail-Followup-To: Wu Fengguang , Con Kolivas , linux list , ck list References: <200603202145.31464.kernel@kolivas.org> <20060323113118.GA9329@spherenet.spherevision.org> <20060323131439.GA4700@mail.ustc.edu.cn> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20060323131439.GA4700@mail.ustc.edu.cn> User-Agent: Mutt/1.5.11+cvs20060126 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1681 Lines: 46 On Thu, Mar 23, 2006 at 09:14:39PM +0800, Wu Fengguang wrote: > Hi Rodney, > > Thanks for your testing :) > > On Thu, Mar 23, 2006 at 05:31:18AM -0600, Rodney Gordon II wrote: > > Adaptive readahead: I had probs with this before, and I still do.. On > > a desktop if you have odd problems (nothing responding for SECONDS, > > very slow disk I/O during heavy I/O, etc..) disable it. > > Your problem on I/O latency with ara can be tracked down with the help > of Ingo's latency tracing patch. It goes like this: > > 1) download > http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.16.tar.bz2 > http://www.vanheusden.com/ara/adaptive-readahead-11-2.6.16-rc6.patch.gz > http://people.redhat.com/mingo/latency-tracing-patches/latency-tracing-v2.6.16.patch > > 2) > tar jxf linux-2.6.16.tar.bz2 > gunzip adaptive-readahead-11-2.6.16-rc6.patch.gz > cd linux-2.6.16 > patch -p1 < ../adaptive-readahead-11-2.6.16-rc6.patch > patch -p1 < ../latency-tracing-v2.6.16.patch > > 3) compile kernel with Adaptive readahead support > 4) boot with the new kernel, and run > echo 0 > /proc/sys/kernel/preempt_max_latency > 5) feel some latency problems > 6) report the content of /proc/latency_trace > > Thanks, > Wu Will try this as soon as I can get some net drivers working under 2.6.16 ... -r -- Rodney "meff" Gordon II -*- meff@pobox.com Systems Administrator / Coder Geek -*- Open yourself to OpenSource - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/