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

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Date:	Tue, 26 Feb 2008 15:41:27 -0800
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Ravikiran Thirumalai" <kiran@...lemp.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 3:31 PM, Ravikiran Thirumalai <kiran@...lemp.com> wrote:
> On Tue, Feb 26, 2008 at 03:16:16PM -0800, Yinghai Lu wrote:
>  >On Tue, Feb 26, 2008 at 1:24 PM, Ravikiran Thirumalai <kiran@...lemp.com> 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
>  >>  ><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.
>  >
>  >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.

can you try x86.git#testing your vsmp to see if is_vsmp_box is working?

http://people.redhat.com/mingo/x86.git/README

YH
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