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Date: Fri, 09 Nov 2001 16:51:09 -0800
From: "Martin J. Bligh" <Martin.Bligh@us.ibm.com>
Reply-To: "Martin J. Bligh" <Martin.Bligh@us.ibm.com>
To: Andreas Dilger <adilger@turbolabs.com>, aputhiya <aputhiya@temple.edu>
cc: linux-smp@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: APIC Cluster Model
Message-ID: <302322260.1005324669@mbligh.des.sequent.com>
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>> Linux uses FLAT MODEL for setting up the IO APIC for SMP machines (Intel
>> IA-32  arch). I was wondering if the CLUSTER MODEL has been implemented
>> in any of  later SMP kernels?
> 
> Yes, the IBM folks implemented this for CONFIG_MULITQUAD.  I don't know
> the details, but it is in stock 2.4.13+ kernels at least.

Look for things switched on clustered_apic_mode - some of it is
specific to IBM NUMA-Q (and should probably be switched on
something else that's also triggered by CONFIG_MULTIQUAD),
but most of it is switching to clustered APIC mode.

If you have another machine that uses this mode, feel free to
mail me any questions you have about what I did.

Martin.

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