From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261155AbVCaIDS (ORCPT ); Thu, 31 Mar 2005 03:03:18 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261151AbVCaIDS (ORCPT ); Thu, 31 Mar 2005 03:03:18 -0500 Received: from mx2.elte.hu ([157.181.151.9]:7917 "EHLO mx2.elte.hu") by vger.kernel.org with ESMTP id S261155AbVCaIC0 (ORCPT ); Thu, 31 Mar 2005 03:02:26 -0500 Date: Thu, 31 Mar 2005 10:02:17 +0200 From: Ingo Molnar To: Lee Revell Cc: linux-kernel , Andrew Morton , "Jack O'Quin" Subject: Re: Latency tests with 2.6.12-rc1 Message-ID: <20050331080217.GA18446@elte.hu> References: <1111204984.12740.22.camel@mindpipe> <20050319070810.GA20059@elte.hu> <1111218702.13039.5.camel@mindpipe> <1111269392.15042.12.camel@mindpipe> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1111269392.15042.12.camel@mindpipe> 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 * Lee Revell wrote: > So there seems to be a bug in the latency tracer where the timer is > not being reset on reschedule. [...] update: i found a bug in the latency tracer that could explain some of the artifacts you noticed, IRQs would reset the tracing timer under certain circumstances. So sometimes traces would show up, sometimes they wouldnt - and even if traces were generated, they often were truncated. The bug is fixed in the -41-24 patch. If you were hit by this bug then you'll likely see new and larger latencies reported. Ingo