From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sat, 15 Sep 2001 06:23:25 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sat, 15 Sep 2001 06:23:15 -0400 Received: from co3000407-a.belrs1.nsw.optushome.com.au ([203.164.252.88]:50363 "EHLO bozar") by vger.kernel.org with ESMTP id ; Sat, 15 Sep 2001 06:23:06 -0400 Date: Sat, 15 Sep 2001 20:23:14 +1000 From: Andre Pang To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Robert Love Subject: massive sched latency (even with akpm and rml's patches) Mail-Followup-To: linux-kernel@vger.kernel.org, Andrew Morton , Robert Love Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.3.20i Message-Id: <1000549394.284238.2074.nullmailer@bozar.algorithm.com.au> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org hello, i'm getting (regular) latencies of up to 30ms on various kernels, even with Andrew Morton low-latency patches and Nigel Gamble/Robert Love's kernel pre-emption patches. i'm running a Toshiba Satellite Pro 4280XDVD laptop, with 256MB of RAM, and an IBM TravelStar 20GB hard disk. the hard disk has been 'tuned' (hdparm -m16 -c1 -u1 -d1 -k1 -S10 -X66), and for akpm's patch, cat /proc/sys/kernel/lowlatency shows 1. i'm using Benno Senoner's latencytest progam, and i've tried using the binary straight out of his .tar.gz archive as well as compiling my own. i've unloaded the pcmcia, usb and apm modules on some of the tests as well, since i thought they might be causing additional latency. i'm using the ALSA snd-card-ymfpci driver for sound output. reiserfs is being used for the partition which the latencytest is running on. latencytest results are at http://www.algorithm.com.au/hacking/linux-lowlatency kernels marked with 'll' have Andrew Morton's lowlatency patches applied, and kernels marked with 'pe' have the patches from the Linux Kernel Preemption Project applied. any hints? i've got about 500k left on my / partition thanks to massive amount of kernel modules and kernels i've got installed :). i'm willing to do some hacking to the source, but i'm not sure where to start tracking down the problem at the moment. thanks in advance! -- #ozone/algorithm - trust.in.love.to.save