The interleave problem mentioned elsewhere in this thread is possibly a big problem.
High core counts mean that memory bandwidth can be the bottleneck for several
workloads.  Dropping, or reducing, the degree of interleaving will seriously impact
bandwidth (unless your applications are spread out "just right").

In practice this doesn't seem to be that big a problem.

I think because most very memory intensive workloads, use 
all the memory from all the cores, so they effectively interleave
by themselves.

-Andi
-- 
ak@linux.intel.com -- Speaking for myself only.

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