rc.conf(5): comparing kld_list and kldload
freebsd at edvax.de
Mon Oct 22 14:05:06 UTC 2018
On Mon, 22 Oct 2018 05:26:18 +0100, Graham Perrin wrote:
> From <https://www.freebsd.org/cgi/man.cgi?query=rc.conf&sektion=5&manpath=FreeBSD>:
> > …
> > 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.
> > …
> 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).
> Background: difficulty with radeonkms and sddm following a switch
> of -CURRENT to stable/12
> I'm toying with the possibility that faster is not always best;
> that a specific load/start order might help.
Yes, this is such a case.
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...
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