> *Power policy*:
> 
> So how is power policy different? As Peter says,'pack more than spread
> more'.

this is ... a dubiously general statement.

for good power, at least on Intel cpus, you want to spread. Parallelism is 
efficient.

the only thing you do not want to do, is wake cpus up for
tasks that only run extremely briefly (think "100 usec" or less).

so maybe the balance interval is slightly different, or more, you don't balance 
tasks that
historically ran only for brief periods


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