Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266424AbUFQIzO (ORCPT ); Thu, 17 Jun 2004 04:55:14 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266427AbUFQIzO (ORCPT ); Thu, 17 Jun 2004 04:55:14 -0400 Received: from aun.it.uu.se ([130.238.12.36]:33164 "EHLO aun.it.uu.se") by vger.kernel.org with ESMTP id S266424AbUFQIzH (ORCPT ); Thu, 17 Jun 2004 04:55:07 -0400 Date: Thu, 17 Jun 2004 10:55:00 +0200 (MEST) Message-Id: <200406170855.i5H8t05x012553@alkaid.it.uu.se> From: Mikael Pettersson To: david.vanhoose@comcast.net, phyprabab@yahoo.com, rml@ximian.com Subject: Re: Programtically tell diff between HT and real Cc: linux-kernel@vger.kernel.org Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 678 Lines: 16 On Wed, 16 Jun 2004 13:01:02 -0700 (PDT), Phy Prabab wrote: >So, if I understand correctly, there is no way to know >definitively if a cpu is HT or not? Of course there is. Intel's documentation, in particular the IA32 Volume 2 and 3 manuals and application note 485 (CPUID) describe this. They are downloadable as PDFs from developer.intel.com. Use CPUID to retrieve the "number of siblings" value. >1 implies HT actually enabled. - 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/