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

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Message-ID: <86802c440802261516n1ca8ef6eh5e6abdd0c3f959dd@mail.gmail.com>
Date:	Tue, 26 Feb 2008 15:16:16 -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 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.

for amd64 system, when acpi=off
ram to node mapping can be retrieved from pci conf space
apicid to node mapping could be calculated too... with boot_cpu_id
...plus coreid bits.

YH
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