Date: Mon, 22 Oct 2018 16:04:57 +0200 From: Polytropon <freebsd@edvax.de> To: Graham Perrin <grahamperrin@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: rc.conf(5): comparing kld_list and kldload Message-ID: <20181022160457.6f44d232.freebsd@edvax.de> In-Reply-To: <ded0edc1-e6aa-55ee-5b09-e58c11b8240a@gmail.com> References: <ded0edc1-e6aa-55ee-5b09-e58c11b8240a@gmail.com>
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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 > > <https://lists.freebsd.org/pipermail/freebsd-current/2018-October/071783.html>; > > 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. -- Polytropon Magdeburg, Germany Happy FreeBSD user since 4.0 Andra moi ennepe, Mousa, ...
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