linux-kernel - Re: [PATCH] x86_64: make amd quad core 8 socket system not be clustered

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Message-ID: <20080226212418.GJ5914@localdomain>
Date:	Tue, 26 Feb 2008 13:24:18 -0800
From:	Ravikiran Thirumalai <kiran@...lemp.com>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	shai@...lemp.com
Subject: Re: [PATCH] x86_64: make amd quad core 8 socket system not be clustered_box v2

On Tue, Feb 26, 2008 at 01:10:57PM -0800, Yinghai Lu wrote:
>On Tue, Feb 26, 2008 at 12:32 PM, Ravikiran Thirumalai
><kiran@...lemp.com> 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.
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