>Workload considerations aside for the moment, do you know if there is any 
>sizable amount of CPU lost due to overhead from running on the 8 subcapacity 
engines compared to running on 5 full capacity physical engines only?

8 Engines lose more than 5 engines, but the MSU/MIPS ratings take this into 
account.
IE: 8 Engines at n MIPS has the same capacity as 5 Engines at n MIPS.

>If so, is this measured anywhere?

Indirectly, with LSPR.
But, the figures are suspect, to say the least.

-
Too busy driving to stop for gas!

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