Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754643AbYJBJNE (ORCPT ); Thu, 2 Oct 2008 05:13:04 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753227AbYJBJMy (ORCPT ); Thu, 2 Oct 2008 05:12:54 -0400 Received: from one.firstfloor.org ([213.235.205.2]:58619 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753014AbYJBJMy (ORCPT ); Thu, 2 Oct 2008 05:12:54 -0400 To: Chuck Ebbert Cc: Ingo Molnar , linux-kernel@vger.kernel.org, Arjan van de Ven Subject: Re: [patch x86/core] x86: allow number of additional hotplug CPUs to be set at compile time From: Andi Kleen References: <20081001191945.4182d0be@redhat.com> Date: Thu, 02 Oct 2008 11:12:51 +0200 In-Reply-To: <20081001191945.4182d0be@redhat.com> (Chuck Ebbert's message of "Wed, 1 Oct 2008 19:19:45 -0400") Message-ID: <87bpy3pdgs.fsf@basil.nowhere.org> User-Agent: Gnus/5.1008 (Gnus v5.10.8) Emacs/21.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 706 Lines: 17 Chuck Ebbert writes: > The default number of additional CPU IDs for hotplugging is determined > by asking ACPI or mptables how many "disabled" CPUs there are in the > system, but many systems get this wrong so that e.g. a uniprocessor > machine gets an extra CPU allocated and never switches to single CPU > mode. You can set this with additional_cpus=... at boot time. I don't think each runtime option needs a CONFIG option too. -Andi -- 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/