On Wed, Apr 02, 2008 at 05:05:09AM +0200, Dennis Jacobfeuerborn wrote: > Harald Hoyer wrote: > > Dennis Jacobfeuerborn wrote: > >> Harald Hoyer wrote: > >>> Compiling these modules, which are loaded on nearly every PC, in the > >>> kernel cuts down my boot time from 42s to 32s on my computer: > >>> > >>> ata_generic > >>> ata_piix > >> ... > >>> sr_mod > >>> uhci_hcd > >> > >> Does the boot time decrease depending on the number of modules you > >> include in the kernel? Maybe it's just one or a few modules that make > >> up the bulk of that time. > > > > to be tested. was just a rough guess of the most common modules, > > compiled and measured. > > > >> > >> Also should configuring these bits as external modules really have > >> this much of an impact on the boot time? > > > > yep. nash, udev, rc.sysinit.. all wait on module loading > > But 10s or 25% of boot time just for loading the modules? That sounds quite > bad. Maybe instead of moving the modules into the kernel it would be better > to find out why exactly the loading takes so long and to look at possible > optimizations. Almost certainly a lot of it will be spent in parsing /lib/modules/$ver/modules.dep Will Cohen did some experiments by sorting that file so that all the modules that he had loaded were at the top of the file. I forget the exact numbers, but it made a noticable difference. I suspect that if modules.dep was sorted and indexed, that lookups could be made a lot faster than they are now. Dave -- http://www.codemonkey.org.uk -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
