From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1767546AbXCIVXu (ORCPT ); Fri, 9 Mar 2007 16:23:50 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1767545AbXCIVXu (ORCPT ); Fri, 9 Mar 2007 16:23:50 -0500 Received: from gprs189-60.eurotel.cz ([160.218.189.60]:1853 "EHLO spitz.ucw.cz" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1767539AbXCIVXs (ORCPT ); Fri, 9 Mar 2007 16:23:48 -0500 Date: Fri, 9 Mar 2007 21:23:34 +0000 From: Pavel Machek To: Andrew Morton Cc: linux-kernel@vger.kernel.org, Ingo Molnar , Thomas Gleixner , "bugme-daemon@kernel-bugs.osdl.org" , jkarlson@cc.hut.fi Subject: Re: [Bugme-new] [Bug 8100] New: dynticks makes ksoftirqd1 use unreasonable amount of cpu time Message-ID: <20070309212334.GA6447@ucw.cz> References: <200702281734.l1SHYAp0021968@fire-2.osdl.org> <20070228140023.46bbba98.akpm@linux-foundation.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070228140023.46bbba98.akpm@linux-foundation.org> User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi! > bugme-daemon@bugzilla.kernel.org wrote: > > > http://bugzilla.kernel.org/show_bug.cgi?id=8100 > > > > Summary: dynticks makes ksoftirqd1 use unreasonable amount of cpu > > time > > Kernel Version: 2.6.21-rc2 > > Status: NEW > > Severity: low > > Owner: johnstul@us.ibm.com > > Submitter: jkarlson@cc.hut.fi > > > > > > Most recent kernel where this bug did *NOT* occur: > > any kernel without dynticks > > > > Distribution: > > Debian etch with linux-2.6.21-rc{2,1} > > > > Hardware Environment: > > Macbook core2 with bios emulation > > > > Software Environment: > > The problem is obvious when listening to shoutcast stream with kmplayer and > > artsd via wi-fi with wpa (wpa_supplicant) > > > > Problem Description: > > ksoftirqd1 uses ~30% cpu-time (by top) no other symptoms, while > > without dyntikcs cpu-load in similar circumstances is negligible. > > This might be a dynticks feature rather than bug. top lies. top has always lied, now it lies more. Do not trust top. RESOLVED/INVALID? Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html