From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754661AbWKMOAm (ORCPT ); Mon, 13 Nov 2006 09:00:42 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754665AbWKMOAm (ORCPT ); Mon, 13 Nov 2006 09:00:42 -0500 Received: from nf-out-0910.google.com ([64.233.182.189]:3544 "EHLO nf-out-0910.google.com") by vger.kernel.org with ESMTP id S1754661AbWKMOAl (ORCPT ); Mon, 13 Nov 2006 09:00:41 -0500 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=IauhdqLlHo1yIbSy17lZ94OS2vvfggEoELPcogz8qp9diRwcyPVeyt8hmwdTN+V8nWvQgoa4Myc0cQpUR4Zmy1mLUeYMy9zenURCJTiuEH0MHYhl8wZmTruZi7m2cvZwjcfnth72QD8g3D1JKl5pdloYZ5P110iyH7nzfCx7ASo= Message-ID: <9a8748490611130600m3b63349eu53b437da5c75a775@mail.gmail.com> Date: Mon, 13 Nov 2006 15:00:39 +0100 From: "Jesper Juhl" To: "Shaun Q" Subject: Re: Dual cores on Core2Duo not detected? Cc: linux-kernel@vger.kernel.org In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On 13/11/06, Shaun Q wrote: > Hi there everyone -- > > I'm trying to build a custom kernel for using both cores of my new > Core2Duo E6600 processor... > > I thought this was simply a matter of enabling the SMP support in the > kernel .config and recompiling, but when the kernel comes back up, still > only one core is detected. > > With the default vanilla text-based SuSE 10.1 install, it does find both > cores... > > Anyone have any pointers for me on what I might be missing? > This is probably not your problem, but it could be, so worth checking. Are you booting with maxcpus=1 on your kernel commandline? Another thing could be that you need to set CONFIG_NR_CPUS to something more than 2. at least in the past some people observed that depending on hov CPUs/cores got numbered CONFIG_NR_CPUS needed to be set at least as high as the highest numbered core. Try setting it to 8 and see if that makes a difference. On a related note; you probably also want to enable CONFIG_SCHED_MC in addition to just SMP support. -- Jesper Juhl Don't top-post http://www.catb.org/~esr/jargon/html/T/top-post.html Plain text mails only, please http://www.expita.com/nomime.html