Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262530AbVEMUen (ORCPT ); Fri, 13 May 2005 16:34:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262526AbVEMUdq (ORCPT ); Fri, 13 May 2005 16:33:46 -0400 Received: from orb.pobox.com ([207.8.226.5]:27585 "EHLO orb.pobox.com") by vger.kernel.org with ESMTP id S262530AbVEMUSq (ORCPT ); Fri, 13 May 2005 16:18:46 -0400 Date: Fri, 13 May 2005 13:18:40 -0700 From: "Barry K. Nathan" To: "Richard F. Rebel" , Andi Kleen , Gabor MICSKO , linux-kernel@vger.kernel.org Subject: Re: Hyper-Threading Vulnerability Message-ID: <20050513201840.GB7436@ip68-225-251-162.oc.oc.cox.net> References: <1115963481.1723.3.camel@alderaan.trey.hu> <1116009483.4689.803.camel@rebel.corp.whenu.com> <20050513191443.GN27568@mail> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20050513191443.GN27568@mail> User-Agent: Mutt/1.5.6i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 942 Lines: 25 On Fri, May 13, 2005 at 03:14:43PM -0400, Jim Crilly wrote: > And what if you have more than one physical HT processor? AFAIK there's no > way to disable HT and still run SMP at the same time. Actually, there is; read my post earlier in this thread: http://marc.theaimsgroup.com/?l=linux-kernel&m=111598859708620&w=2 To elaborate on the "check dmesg" part of that e-mail: After you reboot with "maxcpus=2" (or however many physical CPU's you have), you need to make sure you have messages like this, which indicate that it really worked: WARNING: No sibling found for CPU 0. WARNING: No sibling found for CPU 1. (and so on, if you have more than 2 CPU's) -Barry K. Nathan - 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/