On 4/5/2010 8:14, Paul E. McKenney wrote:
quoted text
> So the main issue is that for many workloads, it is best to run full bore
> and get done quickly, thus allowing the entire machine to be powered down?

yep

quoted text
>
> If so, it seems likely that there would be some workloads that were sometimes
> unable to use all the CPUs, in which case shutting down (idling, offlining,
> dyntick-idling, whatever) the excess CPUs might nevertheless be the right
> thing to do.

but the point is that the normal scheduler + idle behavior gives you exactly that
in a natural way !
If you don't have enough work (tasks) to keep all cores busy, the others are and stay idle.
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