From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 14 Oct 2002 04:47:12 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 14 Oct 2002 04:47:12 -0400 Received: from mailout09.sul.t-online.com ([194.25.134.84]:14994 "EHLO mailout09.sul.t-online.com") by vger.kernel.org with ESMTP id convert rfc822-to-8bit; Mon, 14 Oct 2002 04:47:11 -0400 Message-ID: <3DAA85D8.70D9FF25@folkwang-hochschule.de> Date: Mon, 14 Oct 2002 10:52:40 +0200 From: Joern Nettingsmeier X-Mailer: Mozilla 4.79 [en] (X11; U; Linux 2.5.42 i686) X-Accept-Language: en MIME-Version: 1.0 To: Andrew Morton CC: linux-audio-dev@music.columbia.edu, linux-kernel@vger.kernel.org Subject: Re: [linux-audio-dev] latency performance of 2.4 and 2.5... References: <3DA6C8A3.2892656@folkwang-hochschule.de> <3DAA7E8F.36B03682@folkwang-hochschule.de> <3DAA8200.2AF20C5C@digeo.com> Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Andrew Morton wrote: > > Joern Nettingsmeier wrote: > > > > some new interesting results with 2.5.42: > > > > http://spunk.dnsalias.org/latencytest/2.5.42/2x256.html > > > > overall much worse, *but* greatly reduced latency peaks (max. 6 ms) as > > compared to 2.5.41: > > > > http://spunk.dnsalias.org/latencytest/2.5.41/2x256.html > > > > here the peaks easily reach 13 ms. > > Rather depends on the filesystem. ext3 does its own write scheduling, > and does stuff inside lock_kernel(). It needs a couple of scheduling > points I guess. > > I'd expect ext2 to work OK with preemption, but nobody has really > looked yet. Unless you're using ftruncate() (grr.) oh, i should have stated i'm using reiserfs on /, /usr and /var (var being a softraid-0). -- Jörn Nettingsmeier Kurfürstenstr 49, 45138 Essen, Germany http://spunk.dnsalias.org (my server) http://www.linuxdj.com/audio/lad/ (Linux Audio Developers)