Re: APIC Cluster Model

Martin J. Bligh (Martin.Bligh@us.ibm.com)
Fri, 09 Nov 2001 16:51:09 -0800

>> 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.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/