From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262135AbVDFMrA (ORCPT ); Wed, 6 Apr 2005 08:47:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262146AbVDFMq7 (ORCPT ); Wed, 6 Apr 2005 08:46:59 -0400 Received: from gizmo03ps.bigpond.com ([144.140.71.13]:16100 "HELO gizmo03ps.bigpond.com") by vger.kernel.org with SMTP id S262135AbVDFMqx (ORCPT ); Wed, 6 Apr 2005 08:46:53 -0400 Message-ID: <4253DA3A.5040703@bigpond.net.au> Date: Wed, 06 Apr 2005 22:46:50 +1000 From: Doug Gray User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.2) Gecko/20030208 Netscape/7.02 X-Accept-Language: en-us, en MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: [Fwd: Hyperthreading on dual Xeon VME board] Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Folks, How can I get Hyperthreading working on my dual Xeon board when the BIOS does not contain the ACPI support module? Is there a magic set of kernel options that will get the kernel to start the Hyperthreaded CPUs? Background: I am having a problem with a dual (physical) Xeon VME single board (from GMS model V269)) getting hyperthreading up and going on the CPUs. Two physical CPUs are recognised but not the I have Fedora Core 3 installed with the SMP kernel now upgraded (rpm) to 2.6.10 The board manufacturer has not included the ACPI module in the BIOS (AMIBIOS8) for their own reasons. GMS position is that this is only a power management function and users of this board would not require power manangement. The BIOS Northbridge (Serverworks GC-LE) support does have a switch option to enable hyperthreading, this is enabled. As I understand ACPI the BIOS passes configuration information about the CPUs to the Linux Kernel which then know how to initialise the Hyperthreading CPUs. Apparently Windows does not require this information from the Kernel to run Hyperthreading so naturally GMS (the board manufacturer) is not willing to spend the effort to get ht on Linux sorted out. On booting the Linux dmesg shows the message "ACPI: Unable to locate RSDP" which I interpret to mean the Kernel is unable to find the resource information table which should have been setup by the BIOS. I have tried the kernel parameter acpi=ht but this did nothing to activate the ht activity. Does this make sense? Hoping someone can give me some clues. Doug