Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030286AbVIASpf (ORCPT ); Thu, 1 Sep 2005 14:45:35 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030290AbVIASpf (ORCPT ); Thu, 1 Sep 2005 14:45:35 -0400 Received: from fmr16.intel.com ([192.55.52.70]:56273 "EHLO fmsfmr006.fm.intel.com") by vger.kernel.org with ESMTP id S1030286AbVIASpe convert rfc822-to-8bit (ORCPT ); Thu, 1 Sep 2005 14:45:34 -0400 X-MimeOLE: Produced By Microsoft Exchange V6.5.7226.0 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Subject: RE: [PATCH] acpi-cpufreq: Remove P-state read after a P-state write in normal path Date: Thu, 1 Sep 2005 14:44:51 -0400 Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PATCH] acpi-cpufreq: Remove P-state read after a P-state write in normal path Thread-Index: AcWu0fDrWwTqA0RoTYm9ntckSAWhfAAUkS6Q From: "Brown, Len" To: "Dominik Brodowski" , "Pallipadi, Venkatesh" Cc: "Andrew Morton" , "linux-kernel" X-OriginalArrivalTime: 01 Sep 2005 18:44:52.0771 (UTC) FILETIME=[3D574F30:01C5AF25] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 900 Lines: 23 >How can we handle it, if we do not even know that it failed? >How should the user recognize something is broken? We probably shouldn't have used the word "fail" here. I expect the IO and MSR accesses will always "succeed", but they may not always have the exact effect the OS requested. I think we (the OS) need to get used to this. The HW reserves the right to second guess the OS for a variety of reasons, including temperature, power, reliability, or dependencies between different hardware units that may not be exposed to the OS. I think as hardware becomes more complex and more power-optimized, we'll see more of this, not less. cheers, -Len - 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/