From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264490AbTFKVjp (ORCPT ); Wed, 11 Jun 2003 17:39:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264494AbTFKVjp (ORCPT ); Wed, 11 Jun 2003 17:39:45 -0400 Received: from e6.ny.us.ibm.com ([32.97.182.106]:33665 "EHLO e6.ny.us.ibm.com") by vger.kernel.org with ESMTP id S264490AbTFKVjn convert rfc822-to-8bit (ORCPT ); Wed, 11 Jun 2003 17:39:43 -0400 Content-Type: text/plain; charset="iso-8859-15" From: James Cleverdon Reply-To: jamesclv@us.ibm.com Organization: IBM xSeries Linux Solutions To: Mika =?iso-8859-15?q?Penttil=E4?= , "Protasevich, Natalie" Subject: Re: [PATCH 2/2][2.5]Unisys ES7000 platform subarch Date: Wed, 11 Jun 2003 14:52:24 -0700 User-Agent: KMail/1.4.3 Cc: Linux Kernel References: <3FAD1088D4556046AEC48D80B47B478C022BDA75@usslc-exch-4.slc.unisys.com> <3EE75144.4030300@kolumbus.fi> In-Reply-To: <3EE75144.4030300@kolumbus.fi> MIME-Version: 1.0 Content-Transfer-Encoding: 8BIT Message-Id: <200306111452.24518.jamesclv@us.ibm.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wednesday 11 June 2003 08:56 am, Mika Penttilä wrote: > Just out of curiosity, what are "Physical Cluster" and "Logical > Cluster"? This terminology doesn't appear in Intel documentation. > AFAIK, IPIs are currently always sent using logical destination mode, > and in your patch ioapic entries have logical mode in cluster case. So > where does physical cluster come into play? > > --Mika Starting with P4s, Intel has enabled physical interrupts that correctly use the upper nibble of the destination field when clustered addressing mode is turned on. Hence the name "Physical Cluster", even if it may not be official terminology. -- James Cleverdon IBM xSeries Linux Solutions {jamesclv(Unix, preferred), cleverdj(Notes)} at us dot ibm dot com