From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753938AbYARGvW (ORCPT ); Fri, 18 Jan 2008 01:51:22 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750988AbYARGvN (ORCPT ); Fri, 18 Jan 2008 01:51:13 -0500 Received: from one.firstfloor.org ([213.235.205.2]:53902 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750950AbYARGvM (ORCPT ); Fri, 18 Jan 2008 01:51:12 -0500 Date: Fri, 18 Jan 2008 07:54:28 +0100 From: Andi Kleen To: "H. Peter Anvin" Cc: Kyle McMartin , Andi Kleen , tglx@linutronix.de, mingo@redhat.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH] x86: make clflush a required feature on x86_64 Message-ID: <20080118065428.GA12594@one.firstfloor.org> References: <20080118045921.GB974@phobos.i.cabal.ca> <20080118060124.GC1726@phobos.i.cabal.ca> <479046BA.7090903@zytor.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <479046BA.7090903@zytor.com> User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > Simulators can be fixed, They could, but why? I don't know of a good reason to require CLFLUSH. > I just verified that Bochs 2.3.0 lacks this CPUID bit whereas the > current version, 2.3.6, enables CLFLUSH iff SSE2 is enabled. Qemu 0.9.0 > has CLFLUSH. Andi, do you happen to know of any specific simulators > which are problematic? I would assume any recent version of SimNow is > up to date. I don't know of any specific ones that lack CLFLUSH, although Bochs definitely had similar problems in the past. -Andi