On Sat, 11.06.2011 at 13:55:15 -0700, Doug Barton wrote: > On 6/11/2011 1:02 PM, Warner Losh wrote: > > > > On Jun 11, 2011, at 12:17 PM, Doug Barton wrote: > > > >> On 6/11/2011 6:07 AM, Robert Watson wrote: > >>> To me, this seems like the wrong direction. Over the last decade, we've > >>> been trying to move away from conditional compilation of features to > >>> having them be loadable as modules. > >> > >> FWIW, I agree. I'm wondering though, is there still a performance penalty > >> for modules? My understanding in the past was that there is, although for > >> most use cases it's in the statistical noise. Is that still true? > > > > At run time, I believe that's true. At load time, lots of modules can take > > a few seconds longer. > > I have 3 or 4 modules loaded via loader.conf at boot time. They take at > least 2 seconds each. IMO loading everything via loader.conf would slow > the boot so much as to be a non-starter. > > OTOH, I could imagine an rc.d script that depends on mountcritlocal that > could load a list of modules. Unless I'm missing something that would be > several times faster.
I suspect this is your BIOS' fault. I load 22 modules via loader.conf and the loader takes 2, at most 3, seconds to load them all (next to the kernel). This is true for all machines that I own/owned. As you can guess, I'm very much in favour of moving modules from GENERIC to loader.conf ... Uli _______________________________________________ svn-src-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
