Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261323AbTFKQjD (ORCPT ); Wed, 11 Jun 2003 12:39:03 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262813AbTFKQjD (ORCPT ); Wed, 11 Jun 2003 12:39:03 -0400 Received: from holomorphy.com ([66.224.33.161]:15329 "EHLO holomorphy") by vger.kernel.org with ESMTP id S261323AbTFKQjB (ORCPT ); Wed, 11 Jun 2003 12:39:01 -0400 Date: Wed, 11 Jun 2003 09:52:38 -0700 From: William Lee Irwin III To: "Protasevich, Natalie" Cc: "'Mika Penttil?'" , Linux Kernel Subject: Re: [PATCH 2/2][2.5]Unisys ES7000 platform subarch Message-ID: <20030611165238.GF26348@holomorphy.com> Mail-Followup-To: William Lee Irwin III , "Protasevich, Natalie" , 'Mika Penttil?' , Linux Kernel References: <3FAD1088D4556046AEC48D80B47B478C022BDA78@usslc-exch-4.slc.unisys.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3FAD1088D4556046AEC48D80B47B478C022BDA78@usslc-exch-4.slc.unisys.com> Organization: The Domain of Holomorphy User-Agent: Mutt/1.5.4i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1382 Lines: 25 On Wed, Jun 11, 2003 at 11:40:05AM -0500, Protasevich, Natalie wrote: > Clustering on ES7000 follows Intel guidelines, but not quite fall into > certain cluster model category. According to Intel book, cluster can be flat > (on the same bus) or hierarchical (physically separate bus segments). Flat > cluster uses serial bus messaging (like on xAPIC systems) and can support 15 > agents. On both APIC models that ES7000 utilizes, it can support 32 > processors (with xAPICs, 64 hypothreaded P4's, if only OS could support > that). It has special arrangement for the APIC buses and corresponding > numbering for APICs, which reflects its topological nature, so the > conventional APIC cluster numbering schema won't work. Due to those > differences, our clusters are not that "flat", and we call it "physical", > and "logical" really means "hierarchical". I think, our cluster model names > came from some previous distributions that implemented both models, I swear > I didn't invent it myself. They just worked for our case. This nomenclature has also been used by other large i386 system vendors besides Unisys, e.g. Sequent. -- wli - 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/