From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261949AbVFQLTJ (ORCPT ); Fri, 17 Jun 2005 07:19:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261951AbVFQLTJ (ORCPT ); Fri, 17 Jun 2005 07:19:09 -0400 Received: from mx1.elte.hu ([157.181.1.137]:26078 "EHLO mx1.elte.hu") by vger.kernel.org with ESMTP id S261949AbVFQLTG (ORCPT ); Fri, 17 Jun 2005 07:19:06 -0400 Date: Fri, 17 Jun 2005 13:18:22 +0200 From: Ingo Molnar To: "K.R. Foley" Cc: linux-kernel@vger.kernel.org, "Eugeny S. Mints" , Daniel Walker Subject: Re: [patch] Real-Time Preemption, -RT-2.6.12-rc6-V0.7.48-00 Message-ID: <20050617111822.GA28236@elte.hu> References: <20050608112801.GA31084@elte.hu> <42B0F72D.5040405@cybsft.com> <20050616072935.GB19772@elte.hu> <42B160F5.9060208@cybsft.com> <20050616173247.GA32552@elte.hu> <42B1BDF7.1000700@cybsft.com> <20050616204358.GA4656@elte.hu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20050616204358.GA4656@elte.hu> User-Agent: Mutt/1.4.2.1i 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 * Ingo Molnar wrote: > > There doesn't seem to be any actual lockups, just messages. I will try > > disabling the above when I get home this evening. Can't get to the > > system right now. > > i tweaked the softlockup detector in the last patch a bit (to fix > false positives under very high loads), might have broken it on SMP. yeah - found a bug that could explain the symptoms on your system. Called softlockup_tick() from the global timer interrupt, instead of the per-CPU timer interrupt. So on SMP the other CPUs would not see any softlockup ticks at all, and would incorrectly report soft lockups. This bug is fixed in the -48-36 patch i just uploaded. Ingo