rc.d script to load kernel modules

Garrett Cooper yanegomi at gmail.com
Mon Jun 13 18:38:03 UTC 2011


On Mon, Jun 13, 2011 at 10:40 AM, Chris Rees <utisoft at gmail.com> wrote:
>
> On 13 Jun 2011 18:24, "Garrett Cooper" <yanegomi at gmail.com> wrote:
>>
>> On Mon, Jun 13, 2011 at 10:00 AM, Chris Rees <utisoft at gmail.com> wrote:
>> > On 13 Jun 2011 17:24, "Julian Elischer" <julian at freebsd.org> wrote:
>> >>
>> >> On 6/12/11 11:20 PM, Daniel Braniss wrote:
>> >>>>
>> >>>> On 6/12/2011 1:56 AM, Jason Hellenthal wrote:
>> >>>>
>> >>>>> Cutting modules out of the kernel in general does help speed up
>> >>>>> booting
>> >>>>> but loading those same modules later in the boot process will just
>> >>>>> lead
>> >>>>> you back to the same boot time.
>> >>>>
>> >>>> Loading modules via loader.conf is many times slower than doing it
>> >>>> from
>> >>>> disk after the system is partially booted. (As in, 2-3 seconds per
>> >>>> module vs. nearly instantaneous for all 6.)
>> >>>>
>> >>>> I didn't offer my list as an example of what to do, I offered it as a
>> >>>> syntax example. I would of course expect people to use appropriate
>> >>>> discretion to load things in loader.conf that are necessary for boot.
>> >>>> (Of course, the fact that people can easily get this wrong is a
>> >>>> strike
>> >>>> against the technique.)
>> >>>>
>> >>>> There is no point in having an _enable for this script because if the
>> >>>> kld_list is empty, nothing happens.
>> >>>>
>> >>> Doug's solution is what we have been using for a very long time!
>> >>>
>> >>> the loader.conf solution is not practical when it's shared among many
>> >>> hosts -like here where most of the hosts are dataless-, so, moving the
>> > not
>> >>> essential ones to rc.conf was the obvious solution.
>> >>
>> >>
>> >> what would be REALLY cool would be the ability to make loader.conf have
>> > some sort of conditional
>> >> clauses..
>> >>
>> >> e.g. if MAC== 01:02:03:04:05:06
>> >>          blah
>> >>
>> >>
>> >
>> > Isn't it just a shell script?
>>
>>    The values are eval'ed from Forth-code, not /bin/sh -- so it's not
>> a shell script in the way that you're generally used to :).
>>    But yes, it could be made conditional.
>
> I was talking about rc.conf.... is that Forth too?

No, that's definitely bourne shell, but it breaks some tools like
Devin Taske's sysrc, etc if you use that :).

I thought you were talking about what gets read in with device.hints /
loader.conf / loader.rc.

Thanks!
-Garrett


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