From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753209AbZBOJxJ (ORCPT ); Sun, 15 Feb 2009 04:53:09 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751543AbZBOJwz (ORCPT ); Sun, 15 Feb 2009 04:52:55 -0500 Received: from mailhost-i2-m1.mangoosta.org ([78.40.49.165]:54435 "EHLO smtp-delay2.nerim.net" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751285AbZBOJwy (ORCPT ); Sun, 15 Feb 2009 04:52:54 -0500 Date: Sun, 15 Feb 2009 10:51:28 +0100 From: Damien Wyart To: Ingo Molnar Cc: "Rafael J. Wysocki" , Linux Kernel Mailing List , Kernel Testers List Subject: Re: [Bug #12650] Strange load average and ksoftirqd behavior with 2.6.29-rc2-git1 Message-ID: <20090215095128.GA3234@localhost.localdomain> References: <20090215080941.GA2295@localhost.localdomain> <20090215090026.GA31147@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090215090026.GA31147@elte.hu> User-Agent: Mutt/1.5.19 (2009-01-05) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > > Load average is between 0.30 and 0.60 when the machine is idle, the > > two ksoftirqd threads get a very high total running time in top. > > This is on a P4 machine. On a recent laptop, the load is not as > > high, but the ksoftirqd threads also get a very high total running > > time. > Mind having a look at this anomaly with the function graph tracer? We are > interested in a representative trace that shows the weird ksoftirq activities. > [ which trace could possibly pinpoint their origin. ] > Here's the tracing quickstart: > http://redhat.com/~mingo/tip.git/tracing-quickstart.txt > Also attached below. Let me know if you have trouble getting a good trace, > or if any of the steps were non-intuitive or burdensome to you. Thanks for your feedback & explanations; I will try to have a look at all this material asap, I think tomorrow. Damien