From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753312AbXDEREh (ORCPT ); Thu, 5 Apr 2007 13:04:37 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753327AbXDEREh (ORCPT ); Thu, 5 Apr 2007 13:04:37 -0400 Received: from outbound-dub.frontbridge.com ([213.199.154.16]:38548 "EHLO outbound1-dub-R.bigfish.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753312AbXDEREg (ORCPT ); Thu, 5 Apr 2007 13:04:36 -0400 X-BigFish: VP X-Server-Uuid: 5FC0E2DF-CD44-48CD-883A-0ED95B391E89 Message-ID: <46152CA4.9000601@amd.com> Date: Thu, 05 Apr 2007 19:06:44 +0200 From: "Markus Rechberger" User-Agent: Thunderbird 1.5.0.9 (X11/20070304) MIME-Version: 1.0 To: "H. Peter Anvin" cc: "Andreas Herrmann" , "Andi Kleen" , linux-kernel@vger.kernel.org Subject: Re: [PATCH] x86: limit mwait_idle to Intel CPUs References: <20070405140045.GN6356@alberich.amd.com> <200704051624.45747.ak@suse.de> <20070405144442.GP6356@alberich.amd.com> <200704051737.17157.ak@suse.de> <20070405162049.GB14326@alberich.amd.com> <46152A04.1010009@zytor.com> In-Reply-To: <46152A04.1010009@zytor.com> X-OriginalArrivalTime: 05 Apr 2007 17:04:19.0704 (UTC) FILETIME=[735B1780:01C777A4] X-WSS-ID: 6A0BF39C3283292455-01-01 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org H. Peter Anvin wrote: > Andreas Herrmann wrote: >> >> It is not equivalent. Usually users check /proc/cpuinfo for their >> CPU features. Deleting that flag is kind of obfuscation. >> >> I guess some time ago people did not care about their "svm" or "vmx" >> flags. Nowadays (e.g. with kvm) some people are quite happy >> if one of those strings occurs in /proc/cpuinfo (and they are quite >> disappointed if this feature was disabled by BIOS). >> > > What you're saying is that you want it to appear in /proc/cpuinfo for > marketing reasons even though it's not usable. > > The ones in /proc/cpuinfo are cooked values anyway; there is plenty of > history to that effect. > > I would agree with Andi that if as far as Linux is concerned mwait is > unusable on AMD Fam10 processors, then the CPU detection code should > turn this bit off on AMD Fam10 processors. > please see: http://kvm.qumranet.com/kvmwiki/FAQ "How can I tell if I have Intel VT or AMD-V?" Markus -- Markus Rechberger Operating System Research Center AMD Saxony LLC & Co. KG