From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754123AbYLOIIA (ORCPT ); Mon, 15 Dec 2008 03:08:00 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752055AbYLOIHx (ORCPT ); Mon, 15 Dec 2008 03:07:53 -0500 Received: from casper.infradead.org ([85.118.1.10]:39233 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752012AbYLOIHw (ORCPT ); Mon, 15 Dec 2008 03:07:52 -0500 Date: Mon, 15 Dec 2008 09:09:25 +0100 From: Arjan van de Ven To: "Shi, Alex" Cc: "linux-kernel@vger.kernel.org" Subject: Re: is it a timer bug? Message-ID: <20081215090925.7a8f5c6d@infradead.org> In-Reply-To: References: Organization: Intel X-Mailer: Claws Mail 3.6.0 (GTK+ 2.14.4; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 15 Dec 2008 15:07:17 +0800 "Shi, Alex" wrote: > I notice the timer interrupts is quit high on the 2.6.28-rc8 kernel > in my Nehalem machine. A, 180+/second timer interrupts in my Nehalem > machine with tickless enable. B, the timer interrupts reduce to > 10-/second with tickless and highres enable. On 2.6.27 kernel, the > timer interrupts can keep low with tickless kernel whenever the > highres feature is enable or not. So it is timer bug on my machine? > Hi, can you give us the powertop output of these production Core i7 machines? That is the most likely way to get a clue about what is going on... Greetings, Arjan van de Ven -- Arjan van de Ven Intel Open Source Technology Centre For development, discussion and tips for power savings, visit http://www.lesswatts.org