On Wed, 12 Dec 2001, Alan Cox wrote:
> > 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
> tasks.
Don't we need a common abstract interface to describe this topology
informations ?
- Davide
-
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This archive was generated by hypermail 2b29 : Sat Dec 15 2001 - 21:00:23 EST