From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751712AbZKUStu (ORCPT ); Sat, 21 Nov 2009 13:49:50 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750936AbZKUStu (ORCPT ); Sat, 21 Nov 2009 13:49:50 -0500 Received: from out01.mta.xmission.com ([166.70.13.231]:53614 "EHLO out01.mta.xmission.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750838AbZKUStt (ORCPT ); Sat, 21 Nov 2009 13:49:49 -0500 To: Dimitri Sivanich Cc: Ingo Molnar , Suresh Siddha , Yinghai Lu , linux-kernel@vger.kernel.org Subject: Re: [PATCH v6] x86/apic: limit irq affinity References: <20091120211139.GB19106@sgi.com> From: ebiederm@xmission.com (Eric W. Biederman) Date: Sat, 21 Nov 2009 10:49:50 -0800 In-Reply-To: <20091120211139.GB19106@sgi.com> (Dimitri Sivanich's message of "Fri\, 20 Nov 2009 15\:11\:39 -0600") Message-ID: User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-XM-SPF: eid=;;;mid=;;;hst=in02.mta.xmission.com;;;ip=76.21.114.89;;;frm=ebiederm@xmission.com;;;spf=neutral X-SA-Exim-Connect-IP: 76.21.114.89 X-SA-Exim-Mail-From: ebiederm@xmission.com X-SA-Exim-Version: 4.2.1 (built Thu, 25 Oct 2007 00:26:12 +0000) X-SA-Exim-Scanned: No (on in02.mta.xmission.com); Unknown failure Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Dimitri Sivanich writes: > This patch allows for hard numa restrictions to irq affinity on x86 systems. > > Affinity is masked to allow only those cpus which the subarchitecture > deems accessible by the given irq. > > On some UV systems, this domain will be limited to the nodes accessible > to the irq's node. Initially other X86 systems will not mask off any cpus > so non-UV systems will remain unaffected. Is this a hardware restriction you are trying to model? If not this seems wrong. Eric