From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754841Ab0FPHxY (ORCPT ); Wed, 16 Jun 2010 03:53:24 -0400 Received: from ksp.mff.cuni.cz ([195.113.26.206]:37583 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753101Ab0FPHxW (ORCPT ); Wed, 16 Jun 2010 03:53:22 -0400 Date: Wed, 16 Jun 2010 09:53:00 +0200 From: Pavel Machek To: Len Brown Cc: Thomas Renninger , linux-pm@lists.linux-foundation.org, x86@kernel.org, linux-kernel@vger.kernel.org Subject: Re: [linux-pm] idle-test patches queued for upstream Message-ID: <20100616075259.GA1671@ucw.cz> References: <1274928151-30919-1-git-send-email-lenb@kernel.org> <201005271045.33500.trenn@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu 2010-05-27 20:59:07, Len Brown wrote: > > > ... we think we can do better than ACPI. > > > Why exactly? Is there any info missing in the ACPI tables? > > Or is this just to be more independent from OEMs? > > ACPI has a few fundmental flaws here. One is that it reports > exit latency instead of break-even power duration. > The other is that it requires a BIOS writer to > get the tables right. > > Both of these are fatal flaws. Intel is co-author of ACPI spec, right? So what about fixing those? > > > Indeed, on my (production level commerically available) Nehalem desktop > > > the ACPI tables are broken and an ACPI OS idles at 100W. With this > > > driver the box idles at 85W. > > > What exactly was broken there? > > Dell's BIOS developer botched a bug fix immediately before the system > went to market and disabled support for all ACPI C-states except C1. > After several month of shipping systems, they still were unable > to ship them with a fixed BIOS. I always thought that cpu vendors have ways to work with bios manufacturers... -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html