Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754659AbYGMPgS (ORCPT ); Sun, 13 Jul 2008 11:36:18 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751973AbYGMPgJ (ORCPT ); Sun, 13 Jul 2008 11:36:09 -0400 Received: from mga05.intel.com ([192.55.52.89]:51465 "EHLO fmsmga101.fm.intel.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751482AbYGMPgI (ORCPT ); Sun, 13 Jul 2008 11:36:08 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.30,354,1212390000"; d="scan'208";a="595557961" Message-ID: <487A20DF.7060701@linux.intel.com> Date: Sun, 13 Jul 2008 08:35:59 -0700 From: Arjan van de Ven User-Agent: Thunderbird 2.0.0.14 (Windows/20080421) MIME-Version: 1.0 To: Pavel Machek CC: Vegard Nossum , Ingo Molnar , Peter Zijlstra , Linux Kernel Mailing List Subject: Re: v2.6.26-rc7: Negative powertop values References: <19f34abd0806211216y4695c532ndb4935082bd8ea1@mail.gmail.com> <20080621141615.51f7100c@linux.intel.com> <20080706194845.GA5617@ucw.cz> <20080708065251.1d7d681f@linux.intel.com> <20080713115818.GA7517@elf.ucw.cz> In-Reply-To: <20080713115818.GA7517@elf.ucw.cz> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1204 Lines: 30 Pavel Machek wrote: > On Tue 2008-07-08 06:52:51, Arjan van de Ven wrote: >> On Sun, 6 Jul 2008 21:48:45 +0200 >> Pavel Machek wrote: >> >>>> [I assume you know that doing a software unplug you burn more power >>>> than by leaving the cpu idle] >>> We should really fix that one day... >> yeah but it's incredibly hard to get right (in the light of the bios >> constantly changing what our allowed C-states are)... and the best case > > What can happen there? So BIOS decides C4 may no longer be cool idea > because we have AC power now, but that does not mean C4 stops working, > right? or it decides that your voltage regulator needs to operate in a certain mode and the voltage for C4 is no longer available. or .. or ... > > How is changing allowed C-states list supposed to work, anyway? I > mean, we may be in one of those on other CPU when BIOS decides to > change the list... you get an interrupt to notify you of the change ;-) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/