Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752734AbYBZXbi (ORCPT ); Tue, 26 Feb 2008 18:31:38 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1765527AbYBZXbT (ORCPT ); Tue, 26 Feb 2008 18:31:19 -0500 Received: from server54.tchmachines.com ([72.9.244.106]:53462 "EHLO server54.tchmachines.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1765464AbYBZXbR (ORCPT ); Tue, 26 Feb 2008 18:31:17 -0500 Date: Tue, 26 Feb 2008 15:31:11 -0800 From: Ravikiran Thirumalai To: Yinghai Lu Cc: Andi Kleen , Ingo Molnar , Andrew Morton , Linux Kernel Mailing List , shai@scalemp.com Subject: Re: [PATCH] x86_64: make amd quad core 8 socket system not be clustered_box v2 Message-ID: <20080226233111.GA9734@localdomain> References: <20080226033945.GJ3143@localdomain> <20080226034625.GE21577@one.firstfloor.org> <20080226040541.GK3143@localdomain> <86802c440802252127i36fcd164xe6671aada160766a@mail.gmail.com> <20080226184235.GA5914@localdomain> <86802c440802261100j322ee6a6yef9108dc175de459@mail.gmail.com> <20080226203235.GH5914@localdomain> <86802c440802261310y176cdfel38843e264bc71f82@mail.gmail.com> <20080226212418.GJ5914@localdomain> <86802c440802261516n1ca8ef6eh5e6abdd0c3f959dd@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <86802c440802261516n1ca8ef6eh5e6abdd0c3f959dd@mail.gmail.com> User-Agent: Mutt/1.5.13 (2006-08-11) X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server54.tchmachines.com X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - scalemp.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1423 Lines: 37 On Tue, Feb 26, 2008 at 03:16:16PM -0800, Yinghai Lu wrote: >On Tue, Feb 26, 2008 at 1:24 PM, Ravikiran Thirumalai wrote: >> >> On Tue, Feb 26, 2008 at 01:10:57PM -0800, Yinghai Lu wrote: >> >On Tue, Feb 26, 2008 at 12:32 PM, Ravikiran Thirumalai >> > wrote: >> >> On Tue, Feb 26, 2008 at 11:00:58AM -0800, Yinghai Lu wrote: >> >> > >> >> >1. if acpi=off ? >> >> >> >> Well that is not a realistic scenario for any multi chassi NUMA machine, >> >> since the proximity information is very important and turning acpi off >> >> deprives the OS of this information. >> > >> >actually OS should detect the distance instead of rely on SLIT. >> >> How does it do that? ACPI SRAT is needed to determine this, and it wouldn't >> work if acpi=off. > >srat only have apicid to node mapping, and ram to node mapping. Which is very important for performance. > >for amd64 system, when acpi=off >ram to node mapping can be retrieved from pci conf space I was referring to all types of numa systems, not just AMD. The pci config space is amd specific. Multi chassi systems in particular would be acpi SRAT based. Anyways. Kiran -- 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/