Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933759AbZDCVBK (ORCPT ); Fri, 3 Apr 2009 17:01:10 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753245AbZDCVAz (ORCPT ); Fri, 3 Apr 2009 17:00:55 -0400 Received: from relay3.sgi.com ([192.48.156.57]:55987 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751515AbZDCVAy (ORCPT ); Fri, 3 Apr 2009 17:00:54 -0400 Date: Fri, 3 Apr 2009 16:01:17 -0500 From: Cliff Wickman To: Yinghai Lu Cc: Brice Goglin , Chris Worley , linux-kernel@vger.kernel.org Subject: Re: Off topic: Numactl "distance" wrong Message-ID: <20090403210117.GA14582@sgi.com> References: <49D66E83.5070606@inria.fr> <86802c440904031349v31f84f8anf082db7505e60387@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <86802c440904031349v31f84f8anf082db7505e60387@mail.gmail.com> User-Agent: Mutt/1.5.17+20080114 (2008-01-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1937 Lines: 56 On Fri, Apr 03, 2009 at 01:49:27PM -0700, Yinghai Lu wrote: > On Fri, Apr 3, 2009 at 1:16 PM, Brice Goglin wrote: > > Chris Worley wrote: > >> Sorry for an off topic, but I'm hoping somebody can point me in the > >> right direction of where to direct this question... > >> > >> I have an Opteron system where I've seen the HW diagrams, and each of > >> 4 sockets is directly connected (HT) to two other sockets, and two HT > >> hops away from a third (i.e. a simple square topology, no X in the > >> middle). > >> > >> Yet, "numactl --hardware" shows but one hop to each socket: > >> > >> # numactl --hardware > >> ... > >> node 0 1 2 3 > >> 0: 10 20 20 20 > >> 1: 20 10 20 20 > >> 2: 20 20 10 20 > >> 3: 20 20 20 10 > >> > >> I know this is wrong. > >> > >> Who would be the right person (or list) to talk about this? numactl and libnuma are discussed on linux-numa@vger.kernel.org > >> > > > > IIRC, the motherboard/BIOS is supposed to report numa distances through > > the PXM ACPI method. But I have never seen any opteron box do it > > properly. So you just get 10 for "local" and 20 for "remote". Some > > Itanium machines however report actual distances. > > for x86 64 bit, we are copying SLIT table and save another copy. > > could provide one /sys interface to make user could modify it... > > YH > -- > 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/ -- Cliff Wickman Silicon Graphics, Inc. cpw@sgi.com (651) 683-3824 -- 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/