Re: [PATCH 14/16] sched: make __update_entity_runnable_avg() fast

[Peter Zijlstra]

On Mon, 2012-07-09 at 13:18 -0700, Benjamin Segall wrote:
> Correct, the sum is 1..n. The maximum was chosen as 516/46742 because
> that is the point when the approximation of loop + fixed point math
> being used reaches a maximum, even if the ideal y^n series would cap out
> slightly differently.

Can you run a simple kid like me through the math here.. it seems
strange that fixed point math would give a higher order term than the
regular case. And by such a wide margin as well, (516-320)/32 ~ 6, so
that's 1/64-th of the 320-th term.


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