Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753889AbYGLIWY (ORCPT ); Sat, 12 Jul 2008 04:22:24 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751580AbYGLIWM (ORCPT ); Sat, 12 Jul 2008 04:22:12 -0400 Received: from out02.mta.xmission.com ([166.70.13.232]:59868 "EHLO out02.mta.xmission.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750902AbYGLIWK (ORCPT ); Sat, 12 Jul 2008 04:22:10 -0400 From: ebiederm@xmission.com (Eric W. Biederman) To: "Yinghai Lu" Cc: "Suresh Siddha" , "Ingo Molnar" , "hpa@zytor.com" , "tglx@linutronix.de" , "akpm@linux-foundation.org" , "arjan@linux.intel.com" , "andi@firstfloor.org" , "jbarnes@virtuousgeek.org" , "steiner@sgi.com" , "linux-kernel@vger.kernel.org" , "jeremy@goop.org" References: <20080710181634.764954000@linux-os.sc.intel.com> <20080711203151.GU1678@linux-os.sc.intel.com> <86802c440807111342j5fbf21e1ibd5129718cde4e43@mail.gmail.com> <20080711204521.GA15689@elte.hu> <20080711212418.GV1678@linux-os.sc.intel.com> <86802c440807111502n9835b5fybd99ed388bb71b7d@mail.gmail.com> <86802c440807112016k38c8161aq143463ee57b24c35@mail.gmail.com> <86802c440807112317h23118e29j51113a052720d8db@mail.gmail.com> <86802c440807120049t2aaec131l4c735712f2befb2@mail.gmail.com> Date: Sat, 12 Jul 2008 01:11:49 -0700 In-Reply-To: <86802c440807120049t2aaec131l4c735712f2befb2@mail.gmail.com> (Yinghai Lu's message of "Sat, 12 Jul 2008 00:49:53 -0700") Message-ID: User-Agent: Gnus/5.110006 (No Gnus v0.6) Emacs/21.4 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-SA-Exim-Connect-IP: 24.130.11.59 X-SA-Exim-Mail-From: ebiederm@xmission.com X-Spam-DCC: XMission; sa04 1397; Body=1 Fuz1=1 Fuz2=1 X-Spam-Combo: ;"Yinghai Lu" X-Spam-Relay-Country: X-Spam-Report: * -1.8 ALL_TRUSTED Passed through trusted hosts only via SMTP * 0.0 T_TM2_M_HEADER_IN_MSG BODY: T_TM2_M_HEADER_IN_MSG * -2.6 BAYES_00 BODY: Bayesian spam probability is 0 to 1% * [score: 0.0030] * -0.0 DCC_CHECK_NEGATIVE Not listed in DCC * [sa04 1397; Body=1 Fuz1=1 Fuz2=1] * 0.0 XM_SPF_Neutral SPF-Neutral Subject: Re: [patch 00/26] x64, x2apic/intr-remap: Interrupt-remapping and x2apic support X-SA-Exim-Version: 4.2 (built Thu, 03 Mar 2005 10:44:12 +0100) X-SA-Exim-Scanned: Yes (on mgr1.xmission.com) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1084 Lines: 27 "Yinghai Lu" writes: >>> also read the x2APIC spec pdf, it doesn't say anything about interrupt >>> remapping...need to be used with x2apic... >> >> Clustered logical mode won't work as it requires > 16 bits of apicid. >> So only flat physical mode will work. > > current read_apic_id in genx2apic_cluster and genx2apic_phys is the same... There is a fixed defined mapping between logical & physical mappings, so that may not be an issue. A logical cluster apicid is encoded with the high 16bits being the cluster number, and the low 16bits being a bitmap of which core in the cluster to send the irq to. It sounded like a single cluster can not span multiple sockets. So in practice if you have 2 sockets you have a cluster id of 1. Which means physical apic ids over 16 and logical apicids over 65536. Eric -- 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/