> Skip clock calibration if cpu being brought online is exactly the same
> speed, stepping, etc., as the previous cpu. This significantly reduces
> the time to boot very large systems. 

Do we scan through the cpus in a way that makes this really useful I.e.
pounding through the cpus on a node - which are likely to be the
same - before going on to the next node?  Just looking at the
previous cpu won't help as much if we scan "breadth-first".

-Tony
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