From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265451AbTFZHpR (ORCPT ); Thu, 26 Jun 2003 03:45:17 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265452AbTFZHpQ (ORCPT ); Thu, 26 Jun 2003 03:45:16 -0400 Received: from smtp8.wanadoo.fr ([193.252.22.30]:21422 "EHLO mwinf0102.wanadoo.fr") by vger.kernel.org with ESMTP id S265451AbTFZHpO (ORCPT ); Thu, 26 Jun 2003 03:45:14 -0400 From: "R.C" To: linux-kernel@vger.kernel.org Subject: HyperThreading not working under 2.4.21 Date: Thu, 26 Jun 2003 09:57:48 +0200 User-Agent: KMail/1.5.2 MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200306260957.48103.rafaled@wanadoo.fr> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hello there, I recently tried to upgrade to the 2.4.21 vanilla kernel. I am using a Pentium IV 3,06ghz HT. Amongst other things, I enabled the following options: "Pentium-4 processor Family, SMP support, ACPI support". I tried it with both ACPI support on and off. I can join a copy of my .config if it is required. Anyway, when booting the 2.4.21 kernel my second logical processor is not detected at all. All works as if I had only one processor. There is no error message. A cat /proc/cpuinfo reports only one cpu. This problem only occurs with 2.4.21 kernel. My HT processor was working perfectly with any branch of the 2.4.20 serie (I was using 2.4.20-ck6). My second logical processor was perfectly recognized. Thus, it does not seem to be a problem with bios or mb settings. A "very" quick search through google made me conclude that this problem had not been reported yet so please, forgive me if you are all already aware of such a problem. Best regards, R.C P.S: join a copy to my e-mail adress if you may.