> On Mar 29, 2015, at 6:37 PM, Garrett Cooper <yaneurab...@gmail.com> wrote: > >> >> On Mar 29, 2015, at 15:56, Warner Losh <i...@bsdimp.com> wrote: >> >>> On Mar 29, 2015, at 2:29 PM, Craig Rodrigues <rodr...@freebsd.org> wrote: >>> >>> On Sun, Mar 29, 2015 at 11:04 AM, Warner Losh <i...@bsdimp.com> wrote: >>> >>> If we built a UFS1-only boot2, that would fit in the 7.5k we have left >>> to play with. We could then build a UFS2-only boot2 that would easily >>> fit in the like 32k limit that UFS2 has. >>> >>> The only reason we went to supporting both was to have something >>> universal. Since it requires a reformat to go from UFS1 -> UFS2 we >>> wanted the transition to be as smooth as possible so you didn’t have >>> to add boot blocks into the mix. >>> >>> Now the only people that use UFS1 are people with really old systems >>> that are never going to upgrade, or people building new systems with >>> UFS1 because they are space constrained (for whatever reasons that >>> we’re not going to debate here: they are still real). >>> >>> In the past 5 years, I have worked on some embedded systems where UFS1 was >>> chosen because of very low memory and disk space requirements. >>> So those systems are real and out there. >>> >>> Just out of curiousity, what is it about newer compilers that cause >>> the size of boot2 to increase so much? >>> >>> Could we do some silly things like removing/reducing the use of printf() >>> to save some more bytes, in order to buy us more time, before having >>> to rewrite everything? :) >> >> Removing printf isn’t going to save us. It usually compiles to 80-120 bytes. >> >> I think the only sane way forward is boot2.ufs1 an boot2.ufs2 plus maybe >> some safety belts in the boot block splatter programs to prevent >> brickification. > > Since the proposal to split up the code by filesystems is on the table, would > it make sense to do something similar for zfs? > Thanks!
zfs isn’t in boot2 by default, just ufs1 and ufs2, so I on’t understand the question. Warner
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