Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754219AbZICFT7 (ORCPT ); Thu, 3 Sep 2009 01:19:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754183AbZICFT6 (ORCPT ); Thu, 3 Sep 2009 01:19:58 -0400 Received: from bilbo.ozlabs.org ([203.10.76.25]:53302 "EHLO bilbo.ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753870AbZICFT6 (ORCPT ); Thu, 3 Sep 2009 01:19:58 -0400 Date: Thu, 3 Sep 2009 15:15:16 +1000 From: Anton Blanchard To: Josh Triplett Cc: linux-kernel@vger.kernel.org, Tim Pepper , Paul McKenney , John Stultz , Christoph Lameter , Jamey Sharp Subject: Re: [RFC PATCH] Turn off the tick even when not idle Message-ID: <20090903051516.GA9646@kryten> References: <20090901154327.GA10024@feather> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090901154327.GA10024@feather> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 643 Lines: 20 Hi Josh, > The following patch (not for application any time soon) hacks away the > timer interrupt even when not idle, by triggering the nohz mechanism > even if not running the idle task. Nice :) I tested it on a ppc64 box, and threw the graphs up here: http://ozlabs.org/~anton/linux/osjitter/ With the patch applied, we saw only one interruption in the 10 second window I measured. Anton -- 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/