From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750740AbWDINTX (ORCPT ); Sun, 9 Apr 2006 09:19:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750741AbWDINTX (ORCPT ); Sun, 9 Apr 2006 09:19:23 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:41192 "EHLO mx3.mail.elte.hu") by vger.kernel.org with ESMTP id S1750740AbWDINTW (ORCPT ); Sun, 9 Apr 2006 09:19:22 -0400 Date: Sun, 9 Apr 2006 15:16:49 +0200 From: Ingo Molnar To: Darren Hart Cc: linux-kernel@vger.kernel.org, Thomas Gleixner , "Stultz, John" , Peter Williams , "Siddha, Suresh B" , Nick Piggin Subject: Re: RT task scheduling Message-ID: <20060409131649.GA19082@elte.hu> References: <200604052025.05679.darren@dvhart.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200604052025.05679.darren@dvhart.com> User-Agent: Mutt/1.4.2.1i X-ELTE-SpamScore: 0.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=0.0 required=5.9 tests=AWL autolearn=no SpamAssassin version=3.0.3 0.0 AWL AWL: From: address is in the auto white-list X-ELTE-VirusStatus: clean Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org * Darren Hart wrote: > My last mail specifically addresses preempt-rt, but I'd like to know > people's thoughts regarding this issue in the mainline kernel. Please > see my previous post "realtime-preempt scheduling - rt_overload > behavior" for a testcase that produces unpredictable scheduling > results. thanks for the testcase! It indeed triggered a bug in the -rt tree's "RT-overload" balancing feature. The nature of the bug made it trigger much less likely on 2-way boxes (where i do most of my -rt testing), probably that's why it didnt get discovered before. I've uploaded the -rt14 tree with this bug fixed - does it fix the failures for you? Ingo