From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753150Ab1K1Tdu (ORCPT ); Mon, 28 Nov 2011 14:33:50 -0500 Received: from mga03.intel.com ([143.182.124.21]:19883 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754421Ab1K1Tda convert rfc822-to-8bit (ORCPT ); Mon, 28 Nov 2011 14:33:30 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.69,585,1315206000"; d="scan'208";a="41827312" From: Andi Kleen To: "Nicolas Kalkhof" Cc: linux-kernel@vger.kernel.org Subject: Re: Too many poll_idle cpu calls in kernel 3.2 rc-series References: <1587582695.5658131.1322424808507.JavaMail.fmail@mwmweb005> Date: Mon, 28 Nov 2011 11:33:28 -0800 In-Reply-To: <1587582695.5658131.1322424808507.JavaMail.fmail@mwmweb005> (Nicolas Kalkhof's message of "Sun, 27 Nov 2011 21:13:28 +0100 (CET)") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org "Nicolas Kalkhof" writes: > the kernel v3.2 series shows excessive poll_idle calls during system idle phases causing the cpu > (mobile i7 2620M) to heat up and draw additional 10% more power.  All kernel versions between > 3.2-rc1 and 3.2-rc3 are affected. Perf Top and Powertop both show the same issue. > I've posted a similar bug report before: http://marc.info/?l=linux-kernel&m=132164909313594&w=2 > and used perf top -U to verify the poll_idle calls as requested. So it didn't happen with earlier kernels? I would suggest a git bisect in this case. -Andi -- ak@linux.intel.com -- Speaking for myself only