Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932250AbVKBDcp (ORCPT ); Tue, 1 Nov 2005 22:32:45 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932259AbVKBDcp (ORCPT ); Tue, 1 Nov 2005 22:32:45 -0500 Received: from ms-smtp-02.nyroc.rr.com ([24.24.2.56]:57504 "EHLO ms-smtp-02.nyroc.rr.com") by vger.kernel.org with ESMTP id S932250AbVKBDcn (ORCPT ); Tue, 1 Nov 2005 22:32:43 -0500 Subject: Re: 2.6.14-rt1 From: Steven Rostedt To: Carlos Antunes Cc: Fernando Lopez-Lezcano , Ingo Molnar , Rui Nuno Capela , "K.R. Foley" , Florian Schmidt , john stultz , Mark Knecht , Thomas Gleixner , linux-kernel@vger.kernel.org In-Reply-To: References: <20051017160536.GA2107@elte.hu> <20051020195432.GA21903@elte.hu> <20051030133316.GA11225@elte.hu> <1130876293.6178.6.camel@cmn3.stanford.edu> <1130899662.12101.2.camel@cmn3.stanford.edu> <1130900716.29788.22.camel@localhost.localdomain> Content-Type: text/plain Organization: Kihon Technologies Date: Tue, 01 Nov 2005 22:32:22 -0500 Message-Id: <1130902342.29788.23.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.2.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 843 Lines: 24 On Tue, 2005-11-01 at 22:26 -0500, Carlos Antunes wrote: > > It's a simple program I put together to test wakeup latency. Each > thread basically sleeps for 20ms, wakes up and executes a couple of > instructions and goes back to sleep for another 20ms. Multiply this by > a thousand. What I found out is that, inthis situation, and using > realtime-preempt, SCHED_OTHER offers 3 orders of magnitude less > latency than SCHED_FIFO or SCHED_RR. Which suggests to me there is > something fishy going on. Could you supply this program? I like to see what it does on my systems. Thanks, -- Steve - 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/