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Date:      Sun, 19 May 2019 16:14:27 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 219216] sched_bind() blocks if the entropy pool is starved
Message-ID:  <bug-219216-227-qAEB8Ktb4k@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-219216-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-219216-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D219216

--- Comment #11 from Conrad Meyer <cem@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.
> ...
>=20
> 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 (especia=
lly
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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