From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 20 Sep 2001 17:09:58 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 20 Sep 2001 17:09:49 -0400 Received: from tisch.mail.mindspring.net ([207.69.200.157]:32555 "EHLO tisch.mail.mindspring.net") by vger.kernel.org with ESMTP id convert rfc822-to-8bit; Thu, 20 Sep 2001 17:09:31 -0400 Subject: Re: [PATCH] Preemption Latency Measurement Tool From: Robert Love To: Dieter =?ISO-8859-1?Q?N=FCtzel?= Cc: Andrea Arcangeli , Roger Larsson , linux-kernel@vger.kernel.org, ReiserFS List In-Reply-To: <200109200758.f8K7wEG13675@zero.tech9.net> In-Reply-To: <1000939458.3853.17.camel@phantasy> <20010920063143.424BD1E41A@Cantor.suse.de> <20010920084131.C1629@athlon.random> <200109200758.f8K7wEG13675@zero.tech9.net> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT X-Evolution-Format: text/plain X-Mailer: Evolution/0.13.99+cvs.2001.09.19.21.54 (Preview Release) Date: 20 Sep 2001 17:09:17 -0400 Message-Id: <1001020162.6050.149.camel@phantasy> Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 2001-09-20 at 03:57, Dieter Nützel wrote: > You've forgotten a one liner. > > #include > +#include > > But this is not enough. Even with reniced artsd (-20). > Some shorter hiccups (0.5~1 sec). Note (I am repeated myself from an email I just sent) that the conditional schedule won't show better results if current->need_reschedule is unset, since preemption won't be enabled. I need to add explicit support to the preemption-test patch for this. So you may see some better results, but just one time the condition schedule does not occur, you will see the worst result in /proc/latencytimes -- remembers its the 20 worst (perhaps we need average or total latency, too?) Now, with all that said, you should _see_ an improvement with this patch. You say short hiccups. Some? All? How much better is it? -- Robert M. Love rml at ufl.edu rml at tech9.net