From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751204AbVH2H0I (ORCPT ); Mon, 29 Aug 2005 03:26:08 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751205AbVH2H0I (ORCPT ); Mon, 29 Aug 2005 03:26:08 -0400 Received: from dgate1.fujitsu-siemens.com ([217.115.66.35]:30214 "EHLO dgate1.fujitsu-siemens.com") by vger.kernel.org with ESMTP id S1751204AbVH2H0H (ORCPT ); Mon, 29 Aug 2005 03:26:07 -0400 X-SBRSScore: None Message-ID: <4312B87C.5040302@fujitsu-siemens.com> Date: Mon, 29 Aug 2005 09:25:48 +0200 From: Martin Wilck Organization: Fujitsu Siemens Computers User-Agent: Mozilla Thunderbird 0.5 (X11/20040208) X-Accept-Language: de, en-us, en MIME-Version: 1.0 To: "Maciej W. Rozycki" Cc: yhlu , linux-kernel@vger.kernel.org Subject: Re: APIC version and 8-bit APIC IDs References: <42FC8461.2040102@fujitsu-siemens.com.suse.lists.linux.kernel> <42FCA23C.7040601@fujitsu-siemens.com> <20050812133248.GN8974@wotan.suse.de> <42FCA97E.5010907@fujitsu-siemens.com> <42FCB86C.5040509@fujitsu-siemens.com> <20050812145725.GD922@wotan.suse.de> <86802c44050812093774bf4816@mail.gmail.com> <20050812164244.GC22901@wotan.suse.de> <86802c4405081210442b1bb840@mail.gmail.com> <43099FDF.6030504@fujitsu-siemens.com> <430F20BF.1080703@fujitsu-siemens.com> In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Maciej W. Rozycki wrote: > You are unfortunately mistaken -- the spec is explicit about *local* APIC > IDs having to start at 0. There are at least two places in the spec that > refer to that. I see. Thanks for the clarification. > You can always assign 0, 16, 17, etc. to local APICs and then 1, 2, 3, > etc. for I/O APICs. Actually, that's what we did (I messed thinks up in my posting). I think that's an ugly configuration, though, and totally misleading in terms of system topology. > Frankly I don't know what the actual justification > behind the requirement is. Note that the ID of 0 need not necessarily > belong to the BSP. Starting both local APICs and IO-APICs at 0 isa working and aesthetically pleasing solution. We're pursuing that now. Thanks again, Martin -- Martin Wilck Phone: +49 5251 8 15113 Fujitsu Siemens Computers Fax: +49 5251 8 20409 Heinz-Nixdorf-Ring 1 mailto:Martin.Wilck@Fujitsu-Siemens.com D-33106 Paderborn http://www.fujitsu-siemens.com/primergy