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From(Eric W. Biederman)
DateSat, 12 Jul 2008 02:46:44 -0700
SubjectRe: [patch 00/26] x64, x2apic/intr-remap: Interrupt-remapping and x2apic support
"Yinghai Lu" <yhlu.kernel@gmail.com> writes:

>> So in practice if you have 2 sockets you have a cluster id of 1.
>> Which means physical apic ids over 16 and logical apicids over 65536.
> is it like
> 0x0001, 0x0002, 0x0004, 0x0008, ...., 0x8000 in one cluster? so every
> cluster only have 16

Yes.  At least that is how I read the x2apic documentation.  

Eric



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