Re: filemon

On 30/07/2024 12:31, Dag-Erling Smørgrav wrote:
> Miroslav Lachman <000.fbsd@quip.cz> writes:
>> Dag-Erling Smørgrav <des@FreeBSD.org> writes:
>>> This does cause the module to be loaded at boot time, but it's slower
>>> than loading it later, and it increases memory fragmentation.
>> Does this also apply today? I recently read from someone on a mailing
>> list that the kld_list in rc.conf is no longer needed, that any
>> problems it used to solve are solved,
> 
> Loader I/O performance is much better these days so loading modules
> pre-boot doesn't slow the boot down much any more, but it's still more
> than zero, and it still increases low memory fragmentation, and you
> still can't unload a module that was loaded pre-boot.
> 
>> and that the preferred way is to load everything from loader.conf.
> 
> I suspect you're extrapolating here.  There is a very small number of
> cases where loading pre-boot is required (e.g. zfs.ko if your root is on
> zfs) or recommended (e.g. USB HID drivers due to probe ordering issues)
> but in the majority of cases, it is still better (even if only slightly)
> to wait until after boot.

Thank you for the explanation. I will continue to use kld_list.

Kind regards
Miroslav Lachman