Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262805AbUKTMBV (ORCPT ); Sat, 20 Nov 2004 07:01:21 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262767AbUKTL7j (ORCPT ); Sat, 20 Nov 2004 06:59:39 -0500 Received: from mx1.elte.hu ([157.181.1.137]:20117 "EHLO mx1.elte.hu") by vger.kernel.org with ESMTP id S262805AbUKTL5E (ORCPT ); Sat, 20 Nov 2004 06:57:04 -0500 Date: Sat, 20 Nov 2004 13:59:23 +0100 From: Ingo Molnar To: Florian Schmidt Cc: Lee Revell , linux-kernel@vger.kernel.org, Rui Nuno Capela , Mark_H_Johnson@Raytheon.com, "K.R. Foley" , Bill Huey , Adam Heath , Thomas Gleixner , Michal Schmidt , Fernando Pablo Lopez-Lezcano , Karsten Wiese , Gunther Persoons , emann@mrv.com, Shane Shrybman , Amit Shah Subject: Re: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm2-V0.7.29-0 Message-ID: <20041120125923.GD8091@elte.hu> References: <20041111144414.GA8881@elte.hu> <20041111215122.GA5885@elte.hu> <20041116125402.GA9258@elte.hu> <20041116130946.GA11053@elte.hu> <20041116134027.GA13360@elte.hu> <20041117124234.GA25956@elte.hu> <20041118123521.GA29091@elte.hu> <20041118164612.GA17040@elte.hu> <1100920963.1424.1.camel@krustophenia.net> <20041120125057.03b3d8c4@mango.fruits.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20041120125057.03b3d8c4@mango.fruits.de> User-Agent: Mutt/1.4.1i X-ELTE-SpamVersion: MailScanner 4.31.6-itk1 (ELTE 1.2) SpamAssassin 2.63 ClamAV 0.73 X-ELTE-VirusStatus: clean X-ELTE-SpamCheck: no X-ELTE-SpamCheck-Details: score=-4.9, required 5.9, autolearn=not spam, BAYES_00 -4.90 X-ELTE-SpamLevel: X-ELTE-SpamScore: -4 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 867 Lines: 29 * Florian Schmidt wrote: > here are the different layers of preemption: > > - !PREEMPT > - PREEMPT_VOLUNTARY > - PREEMPT > - PREEMPT_RT > > each step forward decreases latencies, at the cost of more runtime > overhead. yes, and here is how they show up in the config: ( ) No Forced Preemption (Server) ( ) Voluntary Kernel Preemption (Desktop) ( ) Preemptible Kernel (Low-Latency Desktop) (X) Complete Preemption (Real-Time) measurements are needed to find out how latencies and runtime overhead vary between these levels. Ingo - 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/