From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752696AbXLYEhU (ORCPT ); Mon, 24 Dec 2007 23:37:20 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751403AbXLYEhI (ORCPT ); Mon, 24 Dec 2007 23:37:08 -0500 Received: from usermail.globalproof.net ([194.146.153.18]:32798 "EHLO usermail.globalproof.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751070AbXLYEhG (ORCPT ); Mon, 24 Dec 2007 23:37:06 -0500 From: "Denys Fedoryshchenko" To: linux-kernel@vger.kernel.org Subject: nmi_watchdog killing tickless feature Date: Tue, 25 Dec 2007 06:36:54 +0200 Message-Id: <20071225043654.M32161@visp.net.lb> X-Mailer: OpenWebMail 2.52 20060502 X-OriginatingIP: 195.69.208.251 (denys@visp.net.lb) MIME-Version: 1.0 Content-Type: text/plain; charset=koi8-r Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Please CC me on reply, i am not subscribed to list. I did small test, and notice that if nmi_watchdog is enabled mpstat 1 06:11:00 CPU %user %nice %sys %iowait %irq %soft %steal %idle intr/s 06:11:01 all 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 993.07 06:11:02 all 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 1007.00 06:11:03 all 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 1005.00 if disabled 06:13:52 CPU %user %nice %sys %iowait %irq %soft %steal %idle intr/s 06:13:53 all 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 1.00 06:13:54 all 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 9.00 06:13:55 all 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 4.00 06:13:56 all 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 2.00 06:13:57 all 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 2.00 The difference is huge, probably in power consumption too. Kernel is relatively standard (2.6.24-rc6-git1), if required i can attach .config If it is not bug, probably good to document, that it is killing powersaving features? -- Denys Fedoryshchenko Technical Manager Virtual ISP S.A.L.