replacing rc.d, since that's almost certainly not relevant to the
original topic of improving the overall boot time.
indeed.
If you analyze the boot process thoroughly you should see that out of
the total time taken to boot, nearly 0 is spent by rc.d actually doing
something. Almost all of the actual time is spent waiting for other
stuff, either the kernel (primarily) or the services that the system is
running actually starting up.
most of boot time consist of
- delay in bootloader. setting autoboot_delay can partially delay it,
delay to zero can be achieved by patching first stage booter that too add
delay
- delay in kernel initialization. making custom kernel helps of course but
still it takes eg 10 seconds on my laptop. putting things that are not
needed instantly at boot - as module - may help. USB being prime example.
- delay at rc.d scripts - there are some delays inserted.
The latter item is the only place where making changes to rc.d is going
to help, and only then by parellelizing, and even then you are not
really going to gain much since most things at boot time are serial.
grep sleep /etc/rc.d/* usr/local/etc/rc.d/*
So while talk of how to get your favorite boot-time manager into FreeBSD
may be entertaining, it's not likely to be productive, and almost
it is unimportant as FreeBSD don't crash.
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