From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262179AbVFHLi4 (ORCPT ); Wed, 8 Jun 2005 07:38:56 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262177AbVFHLhs (ORCPT ); Wed, 8 Jun 2005 07:37:48 -0400 Received: from ipx10786.ipxserver.de ([80.190.251.108]:16279 "EHLO allen.werkleitz.de") by vger.kernel.org with ESMTP id S262181AbVFHLf5 (ORCPT ); Wed, 8 Jun 2005 07:35:57 -0400 Date: Wed, 8 Jun 2005 13:37:18 +0200 From: Johannes Stezenbach To: Brice Goglin Cc: Linus Torvalds , Kernel Mailing List Message-ID: <20050608113718.GA5949@linuxtv.org> Mail-Followup-To: Johannes Stezenbach , Brice Goglin , Linus Torvalds , Kernel Mailing List References: <20050607091144.GA5701@linuxtv.org> <20050608111503.GA5777@linuxtv.org> <42A6D521.606@ens-lyon.org> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <42A6D521.606@ens-lyon.org> User-Agent: Mutt/1.5.9i X-SA-Exim-Connect-IP: 84.189.245.163 Subject: Re: Linux v2.6.12-rc6 X-SA-Exim-Version: 4.2 (built Thu, 03 Mar 2005 10:44:12 +0100) X-SA-Exim-Scanned: Yes (on allen.werkleitz.de) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Brice Goglin wrote: > Johannes Stezenbach a écrit : > > Johannes Stezenbach wrote: > > > >>Hype-threading stopped working for me (probably due to > >>me not enabling ACPI). dmesg output and .config attached. > >>-rc5 worked fine. The board is an Asus P4P800-Deluxe. > >> > >>dmesg: WARNING: 1 siblings found for CPU0, should be 2 > > > > > > Indeed SMT works fine if I enable ACPI. > > Is SMT without ACPI not supported? > > You can pass acpi=ht into the kernel command line to disable > ACPI except the minimum required to get HT support. That's nice, but I was thinking along the lines of: diff -ur linux-2.6.12-rc6.orig/arch/i386/Kconfig linux-2.6.12-rc6/arch/i386/Kconfig --- linux-2.6.12-rc6.orig/arch/i386/Kconfig 2005-06-06 23:16:27.000000000 +0200 +++ linux-2.6.12-rc6/arch/i386/Kconfig 2005-06-08 13:35:08.000000000 +0200 @@ -503,7 +503,7 @@ config SCHED_SMT bool "SMT (Hyperthreading) scheduler support" - depends on SMP + depends on SMP && ACPI default off help SMT scheduler support improves the CPU scheduler's decision making Comments? Is this intended? Johannes