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Date:      Mon, 22 Oct 2018 09:07:40 -0500
From:      Kyle Evans <kevans@freebsd.org>
To:        freebsd@edvax.de
Cc:        grahamperrin@gmail.com,  FreeBSD Mailing List <freebsd-questions@freebsd.org>
Subject:   Re: rc.conf(5): comparing kld_list and kldload
Message-ID:  <CACNAnaEcPG4Mev9YkkmzMY6iNYkWtLaU+dD+4ZTY4y7Ue_j8tQ@mail.gmail.com>
In-Reply-To: <20181022160457.6f44d232.freebsd@edvax.de>
References:  <ded0edc1-e6aa-55ee-5b09-e58c11b8240a@gmail.com> <20181022160457.6f44d232.freebsd@edvax.de>

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On Mon, Oct 22, 2018 at 9:05 AM Polytropon <freebsd@edvax.de> wrote:
>
> On Mon, 22 Oct 2018 05:26:18 +0100, Graham Perrin wrote:
> > From <https://www.freebsd.org/cgi/man.cgi?query=3Drc.conf&sektion=3D5&m=
anpath=3DFreeBSD>:
> >
> > > =E2=80=A6
> > >
> > > kld_list    (str) A list of kernel modules to load right after
> > >             the local disks are mounted.  Loading modules at
> > >             this point in the boot process is much faster than
> > >             doing it via /boot/loader.conf for those modules
> > >             not necessary for mounting local disk.
> > > =E2=80=A6
> >
> > Is there ever any benefit to using kldload instead of kld_list?
>
> It is important when you consider the _time_ during system
> startup. Sometimes modules require to be loaded at a certain
> time, that's when you can (or cannot) use kld_list, which is
> the _default_ method of loading kernel modules.
>
> early: via /boot/loader.conf
>
> intermediate: via kld_list in /etc/rc.conf
>
> almost final: via kldload calls in /etc/rc.local
>
> It's also possible for scripts in /usr/local/etc/rc.d/ to
> load kernel modules, and you could even add something to
> /etc/rc itself to achieve "really final" loading (even though
> manual additions to /etc/rc are discouraged for good reasons).
>

It's worth noting that /boot/loader.conf is not an option for drm
modules in head and stable/12, so only the above "intermediate" and
"almost final" options are suitable for testing here.

Thanks,

Kyle Evans



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