Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267294AbUJISak (ORCPT ); Sat, 9 Oct 2004 14:30:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267291AbUJISak (ORCPT ); Sat, 9 Oct 2004 14:30:40 -0400 Received: from viper.oldcity.dca.net ([216.158.38.4]:11147 "HELO viper.oldcity.dca.net") by vger.kernel.org with SMTP id S267287AbUJISab (ORCPT ); Sat, 9 Oct 2004 14:30:31 -0400 Subject: Re: [ANNOUNCE] Linux 2.6 Real Time Kernel From: Lee Revell To: karim@opersys.com Cc: Sven-Thorsten Dietrich , linux-kernel , Alexander Batyrshin , "Amakarov@Ru. Mvista. Com" , Daniel Walker , "Eugeny S. Mints" , "Ext-Rt-Dev@Mvista. Com" , New Zhang Haitao , "Yyang@Ch. Mvista. Com" , Philippe Gerum In-Reply-To: <416822B7.5050206@opersys.com> References: <41677E4D.1030403@mvista.com> <416822B7.5050206@opersys.com> Content-Type: text/plain Message-Id: <1097346628.1428.11.camel@krustophenia.net> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 Date: Sat, 09 Oct 2004 14:30:28 -0400 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1067 Lines: 25 On Sat, 2004-10-09 at 13:41, Karim Yaghmour wrote: > Sven-Thorsten Dietrich wrote: > > - Voluntary Preemption by Ingo Molnar > > - IRQ thread patches by Scott Wood and Ingo Molnar > > - BKL mutex patch by Ingo Molnar (with MV extensions) > > - PMutex from Germany's Universitaet der Bundeswehr, Munich > > - MontaVista mutex abstraction layer replacing spinlocks with mutexes > > To the best of my understanding, this still doesn't provide deterministic > hard-real-time performance in Linux. Using only the VP+IRQ thread patch, I ran my RT app for 11 million cycles yesterday, with a maximum delay of 190 usecs. How would this not satisfy a 200 usec hard RT constraint? PHB: "I've looked at your proposal and decided it can't be done" Dilbert: "I just did it. It's working perfectly" 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/