Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755171AbWKMPyZ (ORCPT ); Mon, 13 Nov 2006 10:54:25 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755169AbWKMPyZ (ORCPT ); Mon, 13 Nov 2006 10:54:25 -0500 Received: from ref.nmedia.net ([66.39.177.2]:20829 "EHLO ref.nmedia.net") by vger.kernel.org with ESMTP id S1755171AbWKMPyY (ORCPT ); Mon, 13 Nov 2006 10:54:24 -0500 Date: Mon, 13 Nov 2006 07:54:23 -0800 (PST) From: Shaun Q X-X-Sender: shaun@ref.nmedia.net To: Jesper Juhl cc: linux-kernel@vger.kernel.org Subject: Re: Dual cores on Core2Duo not detected? In-Reply-To: <9a8748490611130600m3b63349eu53b437da5c75a775@mail.gmail.com> Message-ID: References: <9a8748490611130600m3b63349eu53b437da5c75a775@mail.gmail.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1689 Lines: 47 On Mon, 13 Nov 2006, Jesper Juhl wrote: > 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? > If only that were it :) Unfortunately, no... > 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. Yup, mine is set to 8 right now.> > On a related note; you probably also want to enable CONFIG_SCHED_MC in > addition to just SMP support. > Already set. > -- > 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 > Thanks for your help :) Shaun - 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/