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Date: Fri, 21 Sep 2012 09:09:56 +0200
From: Pawel Jakub Dawidek <pjd@FreeBSD.org>
To: David O'Brien <obrien@FreeBSD.org>
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Subject: Re: Collecting entropy from device_attach() times.
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On Thu, Sep 20, 2012 at 11:08:15PM -0700, David O'Brien wrote:
> On Fri, Sep 21, 2012 at 07:35:49AM +0200, Pawel Jakub Dawidek wrote:
> > Note that adding sysctl to turn off entropy harvesting from
> > device_attach() is pretty useless, as sysctls can be changed once we
> > start userland and then all device_attach() are already called (modulo
> > drivers loaded later).
>=20
> That is what I had in mind -- .ko drivers loaded post 'initrandom'.
>=20
> The same could be said for kern.random.sys.harvest.interrupt.
> By the time kern.random.sys.harvest.interrupt can be turned off,
> my test system has already processed 784 'origin interrupt' queue
> entries and went from kern.random.sys.seeded=3D0->1.

Yes, this is exactly why I'd like to see corresponding tunable for all
those sysctls.

--=20
Pawel Jakub Dawidek                       http://www.wheelsystems.com
FreeBSD committer                         http://www.FreeBSD.org
Am I Evil? Yes, I Am!                     http://tupytaj.pl

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