From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S269118AbUHXX1v (ORCPT ); Tue, 24 Aug 2004 19:27:51 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S269113AbUHXXXP (ORCPT ); Tue, 24 Aug 2004 19:23:15 -0400 Received: from viper.oldcity.dca.net ([216.158.38.4]:54192 "HELO viper.oldcity.dca.net") by vger.kernel.org with SMTP id S269109AbUHXXWf (ORCPT ); Tue, 24 Aug 2004 19:22:35 -0400 Subject: Re: Scheduler fairness problem on 2.6 series (Attn: Nick Piggin and others) From: Lee Revell To: Peter Williams Cc: spaminos-ker@yahoo.com, linux-kernel In-Reply-To: <412BC984.6060408@bigpond.net.au> References: <20040824211141.13585.qmail@web13921.mail.yahoo.com> <412BC984.6060408@bigpond.net.au> Content-Type: text/plain Message-Id: <1093389752.841.9.camel@krustophenia.net> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 Date: Tue, 24 Aug 2004 19:22:32 -0400 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2004-08-24 at 19:04, Peter Williams wrote: > spaminos-ker@yahoo.com wrote: > > > > Could I do something more useful than just displaying those deltas? Maybe I > > could dump the process list in some way, or enable some debugging code in the > > kernel to find out what is going on? > > You could try Lee Revell's (rlrevell@joe-job.com) latency measuring > patches and also try applying Ingo Molnar's (mingo@elte.hu) > voluntary-preempt patches. > Most of the tools I am using are probably too specific to the audio subsystem to be of much use to you. Just use Ingo's voluntary preemption patch; if this is a scheduler/preemption problem, then it will definitely show up in the traces. Lee