Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763882AbYBBEIv (ORCPT ); Fri, 1 Feb 2008 23:08:51 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759535AbYBBEIo (ORCPT ); Fri, 1 Feb 2008 23:08:44 -0500 Received: from one.firstfloor.org ([213.235.205.2]:41030 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753697AbYBBEIo (ORCPT ); Fri, 1 Feb 2008 23:08:44 -0500 Date: Sat, 2 Feb 2008 05:43:18 +0100 From: Andi Kleen To: Jike Song Cc: Andi Kleen , Rijndael Cosque , linux-kernel@vger.kernel.org Subject: Re: What's the status of x2APIC support in Linux kernel? Message-ID: <20080202044318.GC12644@one.firstfloor.org> References: <26e10850802010043m7375a110t6428d637ed1872bc@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 967 Lines: 21 > Section 5 and section 9.5 describe 'I/OxAPIC'. I'm not sure if it is > already supported by Linux, I guess it is not. I'm not sure what the point of your questions is. Do you want to do something concrete or are you just interested in random buzzwords? Anyways as far as I know Linux supports the IO APICs implemented in all x86 chipsets fully. That is it doesn't use every possible feature they have, but I'm not aware of any particular limitation caused by Linux not supporting some IO APIC feature. The reason for the local x/APIC was that the original non x APIC did not support more than 8 logical CPUs being active in the system. Presumably IO xAPIC refers to the IO APIC without this limitation 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/