From mboxrd@z Thu Jan 1 00:00:00 1970 From: Frederic Weisbecker Subject: Re: power management regression in linux 3.10? Date: Tue, 4 Jun 2013 16:19:54 +0200 Message-ID: <20130604141952.GI14973@somewhere> References: <1370282175.18020.4.camel@localhost> <1426816.yLxoxJJ6NX@vostro.rjw.lan> <51ACF071.702@gmail.com> <2330824.Xqf4iUAbIP@vostro.rjw.lan> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from mail-wg0-f52.google.com ([74.125.82.52]:43018 "EHLO mail-wg0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756073Ab3FDOT6 (ORCPT ); Tue, 4 Jun 2013 10:19:58 -0400 Received: by mail-wg0-f52.google.com with SMTP id z11so267392wgg.19 for ; Tue, 04 Jun 2013 07:19:57 -0700 (PDT) Content-Disposition: inline In-Reply-To: <2330824.Xqf4iUAbIP@vostro.rjw.lan> Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: "Rafael J. Wysocki" Cc: Dirk Brandewie , Michael Karcher , linux-pm@vger.kernel.org, Len Brown On Mon, Jun 03, 2013 at 10:04:30PM +0200, Rafael J. Wysocki wrote: > On Monday, June 03, 2013 12:37:21 PM Dirk Brandewie wrote: > > On 06/03/2013 12:34 PM, Rafael J. Wysocki wrote: > > > On Monday, June 03, 2013 07:56:15 PM Michael Karcher wrote: > > >> Hello, > > >> > > >> I am using an IBM ThinkPad T60 (i915, Core 2 Duo T7200) and recently > > >> upgraded from a custom 3.7 kernel to a custom 3.10-rc4 kernel > > >> (v3.10-rc4-1-gc026d8e). > > >> After upgrading, I get around 17-20W power usage instead of 12-15W power > > >> usage as I had with 3.7. powertop show that CPU0 is in state POLL all of > > >> the idle time, while CPU1 correctly enters C3. With CONFIG_NO_HZ_FULL it is expected that CPU 0 consumes more power because it handles the timekeeping for every other CPUs and so it never stop its tick. Paul McKenney is working on a solution to solve that. But if you see something similar on the other CPUs it's a bug. Thanks.