Re: Near CPUs ...

From: Alan Cox (
Date: Wed Dec 12 2001 - 09:01:43 EST

> that lists metrics between CPUs, ie :
> metric(I, J) = F(cpus_dmap[I][J])
> and this is the easy part.
> How to detect CPUs that are "near" ( on the same bus/mb ) on x86/ia64 hardware ?
> Is the MP configuration data structured in a way that makes you understand
> this mapping, ie :

The MP 1.1/1.4 mappings have no information on memory or locality. The ACPI
stuff seems to have the same limitations. The ACPI one does correctly
describe hyperthreading pairs (two execution units per die) - but while they
are "closer" they are also less efficient than two seperate cpus for most
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This archive was generated by hypermail 2b29 : Sat Dec 15 2001 - 21:00:23 EST