On Fri, 2002-10-25 at 19:45, David D. Hagood wrote:
> I would assert that, at least in the case of the P4, there IS a "major
> core", as the 2 subcores share L1 and bus controller access, as well as
> several other parts of the chip.
>
> I beleive this is to some extent the case in the Power4 modules - that
> each module contains resources shared by the execution units. However, I
> might be full of it, and since there are plenty of @ibm.com's here I
> expect to be corrected shortly....
You are entirely right :)
But argument for siblings vs. subcore is that in the context of the
processors displayed in /proc/cpuinfo known of them are "subscores" of
the other (and thus none of them are the "main core").
Some are just "siblings" in the same parent process package. So given a
dual Xeon machine, you have 4 virtual processors, which are broken into
two sets of two siblings. Those two sets are each part of the same
package.
Robert Love
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