Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759337AbXJCSa3 (ORCPT ); Wed, 3 Oct 2007 14:30:29 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757001AbXJCSaP (ORCPT ); Wed, 3 Oct 2007 14:30:15 -0400 Received: from mga06.intel.com ([134.134.136.21]:37888 "EHLO orsmga101.jf.intel.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751593AbXJCSaN (ORCPT ); Wed, 3 Oct 2007 14:30:13 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.21,226,1188802800"; d="scan'208";a="238778007" Message-ID: <4703DF80.5010405@linux.intel.com> Date: Wed, 03 Oct 2007 11:29:20 -0700 From: Arjan van de Ven User-Agent: Thunderbird 1.5 (Windows/20051201) MIME-Version: 1.0 To: Linus Torvalds CC: Chuck Ebbert , Andrew Morton , Anders Bostr?m , linux-kernel@vger.kernel.org Subject: Re: PROBLEM: high load average when idle References: <20071002.233731.119908363.anders@bostrom.dyndns.org> <20071002150748.906970bc.akpm@linux-foundation.org> <4702C756.8090108@redhat.com> <20071002162613.54c3ef43@laptopd505.fenrus.org> <4703D212.6040304@redhat.com> <4703DD8A.80602@linux.intel.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1166 Lines: 27 Linus Torvalds wrote: > > On Wed, 3 Oct 2007, Arjan van de Ven wrote: >> not sure this is going to help; I mean, the load gets only updated in actual >> timer interrupts... and on a tickless system there's very few of those >> around..... and usually at places round_jiffies() already put a timer on. > > Yeah, you're right. Although in practice, at least on a system running > X, I'd expect that there still is lots of other timers going on, hiding > the issue. eh not really; on a normal distro desktop you maybe have 10 wakeups/sec or so; on a tuned one you have 2 or less. > > Hmm. Maybe Anders' problem stems partly from the fact that he really is > using the tweaks to make that tickless theory more true than it tends to > be on most systems? we fixed a TON of stuff over the last months.. standard desktops (F8 / next Ubuntu) will be around 10 wakeups/sec, in a lab environment you can get below 2 ;) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/