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SubjectRe: APIC Cluster Model

>> 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.


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