[Bug 219216] sched_bind() blocks if the entropy pool is starved

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Sun May 19 16:14:30 UTC 2019


--- Comment #11 from Conrad Meyer <cem at freebsd.org> ---
(In reply to Fabian Keil from comment #9)
> While dd keeps a core busy as expected, rand_harvestq stays below 3%
> cpu use according to top.
> ...
> The fact that rand_harvestq is busy doesn't necessarily indicate that
> the entropy pool is starved.

True.  On 12.0 through head, if you have concurrent random readers (especially
2+), rand_harvestq CPU time may just indicate it is spinning on the global
Fortuna lock while a reader generates random data.  Some more detail in my
earlier comment #10.

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