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

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Date:	Mon, 25 Feb 2008 14:05:45 -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 Mon, Feb 25, 2008 at 11:08 AM, Ravikiran Thirumalai
<kiran@...lemp.com> wrote:
> On Sun, Feb 24, 2008 at 01:29:03PM +0100, Andi Kleen wrote:
>  >On Sat, Feb 23, 2008 at 09:48:42PM -0800, Yinghai Lu wrote:
>  >>
>  >> quad core 8 socket system will have apic id lifting.the apic id range could
>  >> be [4, 0x23]. and apic_is_clustered_box will think that need to three clusters
>  >> and that is large than 2. So it is treated as clustered_box.
>  >
>  >Ok I see you chose the quick hack over doing it properly ...
>  >
>  >>
>  >> and will get
>  >>
>  >> Marking TSC unstable due to TSCs unsynchronized
>  >>
>  >> even the CPUs have X86_FEATURE_CONSTANT_TSC set.
>  >
>  >I doubt that will do the right thing on AMD based vSMP,
>  >which also required the cluster check on AMD iirc.
>  >
>
>  Andi, Yes.  AMD based vSMPowered systems uses clustered APICs, and this
>  check base on cpu vendor id is not good :(.

please check if you happy with

http://lkml.org/lkml/2008/2/24/273

Thanks

Yinghai Lu
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