Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263738AbUJ3A16 (ORCPT ); Fri, 29 Oct 2004 20:27:58 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261644AbUJ3ASV (ORCPT ); Fri, 29 Oct 2004 20:18:21 -0400 Received: from mustang.oldcity.dca.net ([216.158.38.3]:63914 "HELO mustang.oldcity.dca.net") by vger.kernel.org with SMTP id S261637AbUJ3APl (ORCPT ); Fri, 29 Oct 2004 20:15:41 -0400 Subject: Re: [Fwd: Re: [patch] Real-Time Preemption, -RT-2.6.9-mm1-V0.4] From: Lee Revell To: Ingo Molnar Cc: Florian Schmidt , Paul Davis , Thomas Gleixner , LKML , mark_h_johnson@raytheon.com, Bill Huey , Adam Heath , Michal Schmidt , Fernando Pablo Lopez-Lezcano , Karsten Wiese , jackit-devel , Rui Nuno Capela In-Reply-To: <20041029214602.GA15605@elte.hu> References: <20041029170237.GA12374@elte.hu> <20041029170948.GA13727@elte.hu> <20041029193303.7d3990b4@mango.fruits.de> <20041029172151.GB16276@elte.hu> <20041029172243.GA19630@elte.hu> <20041029203619.37b54cba@mango.fruits.de> <20041029204220.GA6727@elte.hu> <20041029233117.6d29c383@mango.fruits.de> <20041029212545.GA13199@elte.hu> <1099086166.1468.4.camel@krustophenia.net> <20041029214602.GA15605@elte.hu> Content-Type: text/plain Date: Fri, 29 Oct 2004 20:15:39 -0400 Message-Id: <1099095339.1579.3.camel@krustophenia.net> Mime-Version: 1.0 X-Mailer: Evolution 2.0.2 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1068 Lines: 27 On Fri, 2004-10-29 at 23:46 +0200, Ingo Molnar wrote: > > One more question, what do you recommend the priorities of the IRQ > > threads be set to? AIUI for xrun-free operation with JACK, all that > > is needed is to set the RT priorities of the soundcard IRQ thread > > highest, followed by the JACK threads, then the other IRQ threads. Is > > this correct? > > correct. softirqs are not used by the sound subsystem so there's no > ksoftirqd dependency. > I don't see much point in latency testing this one yet; I have had to go for the reset button twice in the past hour. Web surfing and a kernel compile kill it pretty quickly. Lockups aside, it's not necessary to use JACK to demonstrate the problem, playing AVIs with mplayer will skip. As a final test I am recompiling with all debug options disabled. Lee - 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/