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

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Date:	Sun, 24 Feb 2008 15:00:52 -0800
From:	Yinghai Lu <Yinghai.Lu@....COM>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	kiran@...lemp.com, shai@...lemp.com
Subject: Re: [PATCH] x86_64: make amd quad core 8 socket system not be
 clustered_box v2

On Sunday 24 February 2008 04:29:03 am 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.
> 
> Cc'ed Kiran/Shai. damage has already hit x86 tree I believe.

do you have bootlog for these box?

IBM summit2, Unisys es70000, and system from scalemp..

DMI could tell the difference?

YH
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