From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arjan van de Ven Subject: Re: [Bug #12152] Huge wakeups number from i1915 Date: Sun, 7 Dec 2008 14:52:03 -0800 Message-ID: <20081207145203.0f998d5b@infradead.org> References: <6VnlupFpCsN.A.2rE.MsEPJB@chimera> <07Xes05z25M.A.VtF.ksEPJB@chimera> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <07Xes05z25M.A.VtF.ksEPJB@chimera> Sender: kernel-testers-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: Content-Type: text/plain; charset="us-ascii" To: "Rafael J. Wysocki" Cc: Linux Kernel Mailing List , Kernel Testers List , Yves-Alexis Perez On Sun, 7 Dec 2008 21:32:54 +0100 (CET) "Rafael J. Wysocki" wrote: > This message has been generated automatically as a part of a report > of recent regressions. > > The following bug entry is on the current list of known regressions > from 2.6.27. Please verify if it still should be listed and let me > know (either way). > > > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=12152 > Subject : Huge wakeups number from i1915 > Submitter : Yves-Alexis Perez > Date : 2008-12-02 16:48 (6 days old) > References : > http://marc.info/?l=linux-acpi&m=122823656702994&w=4 > at least in some of the cases where this has been seen the cause is the following: The i915 DRM driver used to do polling for completion, busy waiting. It moved to be interrupt driven, which is usually better for power, but it will show up as more wakeups in powertop.... -- Arjan van de Ven Intel Open Source Technology Centre For development, discussion and tips for power savings, visit http://www.lesswatts.org From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759299AbYLGWwr (ORCPT ); Sun, 7 Dec 2008 17:52:47 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758928AbYLGWuo (ORCPT ); Sun, 7 Dec 2008 17:50:44 -0500 Received: from casper.infradead.org ([85.118.1.10]:55651 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758382AbYLGWum (ORCPT ); Sun, 7 Dec 2008 17:50:42 -0500 Date: Sun, 7 Dec 2008 14:52:03 -0800 From: Arjan van de Ven To: "Rafael J. Wysocki" Cc: Linux Kernel Mailing List , Kernel Testers List , "Yves-Alexis Perez" Subject: Re: [Bug #12152] Huge wakeups number from i1915 Message-ID: <20081207145203.0f998d5b@infradead.org> In-Reply-To: <07Xes05z25M.A.VtF.ksEPJB@chimera> References: <6VnlupFpCsN.A.2rE.MsEPJB@chimera> <07Xes05z25M.A.VtF.ksEPJB@chimera> 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 Sun, 7 Dec 2008 21:32:54 +0100 (CET) "Rafael J. Wysocki" wrote: > This message has been generated automatically as a part of a report > of recent regressions. > > The following bug entry is on the current list of known regressions > from 2.6.27. Please verify if it still should be listed and let me > know (either way). > > > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=12152 > Subject : Huge wakeups number from i1915 > Submitter : Yves-Alexis Perez > Date : 2008-12-02 16:48 (6 days old) > References : > http://marc.info/?l=linux-acpi&m=122823656702994&w=4 > at least in some of the cases where this has been seen the cause is the following: The i915 DRM driver used to do polling for completion, busy waiting. It moved to be interrupt driven, which is usually better for power, but it will show up as more wakeups in powertop.... -- Arjan van de Ven Intel Open Source Technology Centre For development, discussion and tips for power savings, visit http://www.lesswatts.org