> On 22. aug 2016, at 17:56, Toomas Soome <tso...@me.com> wrote: > > >> On 22. aug 2016, at 17:19, Warner Losh <i...@bsdimp.com> wrote: >> >> On Mon, Aug 22, 2016 at 3:44 AM, Toomas Soome <tso...@me.com> wrote: >>> I do suspect the size difference there is partially due to ficl, in illumos >>> (ficl 4): >>> >>> -rw-r--r-- 1 tsoome staff 132508 aug 22 09:18 libficl.a >>> >>> and freebsd (ficl 3): >>> >>> -rw-r--r-- 1 root wheel 213748 Aug 19 01:57 libficl.a >>> >>> so, there definitely is some space… >> >> Same compiler? Clang bloats the boot code rather substantially, even after >> all the flags to tell it to generate smaller code are used. gcc 4.2.x >> built stuff >> was substantially smaller. >> >> There's a 520kb limit enforced in the boot1 for similar reasons. Looks like >> the combination of options makes us use just enough extra memory to >> sink the battleship... >> >> Warner >> > > > Actually I only now realized I was comparing apples with oranges… I forgot > the fbsd builds 32bit version in ficl32, this one is 64bit. and yes the 32bit > version is not that big at all:D > > Also, after done some digging, I have found few instances of duplicated code > (we can share sha2 with geli and so if sha512 is already needed, it will > become another “free lunch”). Also, unless I’m mistaken, for some reason the > bzip *compression* is brought in - correct me if I’m wrong, but afaik only > decompression is needed… > > So before going after “useless features”, there are some “hidden” resources > to remove extra fat. >
I did some more digging. while ld has —gc-sections to clean up unused bits, to make it effective, the code build does also need -Os -fdata-sections -ffunction-sections. So I did just very simple test by adding those flags to bsd.stand.mk and: first the “default” binaries from /boot: -r-xr-xr-x 1 root wheel 446464 Aug 19 08:46 /boot/zfsloader -rw-r--r-- 1 root wheel 438272 Aug 23 00:30 /boot/zfsloader.b -r-xr-xr-x 1 root wheel 446464 Aug 5 08:37 /boot/zfsloader.old -r--r--r-- 1 root wheel 406568 Aug 19 08:46 /boot/userboot.so (note, zfsloader.b here is built with https://reviews.freebsd.org/D7600) now after adding compile flags -Os -fdata-sections -ffunction-sections: -rw-r--r-- 1 root wheel 389120 Aug 23 10:12 zfsloader -rwxr-xr-x 1 root wheel 378156 Aug 23 10:12 zfsloader.bin -rwxr-xr-x 1 root wheel 437514 Aug 23 10:12 zfsloader.sym -rwxr-xr-x 1 root wheel 375912 Aug 23 10:03 userboot.so and finally test for Andriy with: LOADER_BZIP2_SUPPORT=yes LOADER_FIREWIRE_SUPPORT=yes -rw-r--r-- 1 root wheel 421888 Aug 23 10:22 zfsloader -rwxr-xr-x 1 root wheel 409932 Aug 23 10:22 zfsloader.bin -rwxr-xr-x 1 root wheel 472021 Aug 23 10:22 zfsloader.sym -rwxr-xr-x 1 root wheel 375912 Aug 23 10:22 userboot.so note the userboot.so did not change from those flags. This is just an result from compile, and by adding 3 options to bsd.stand.mk; however, not all Makefiles in loader tree seem to include it, and most importantly, haven’t tested real boot yet;) To conclude, some more work is needed to review the Makefiles, build options used etc, also I don’t know all the background why the compiler options are set as they currently are - were there any related compiler/linker bugs, or any other reasons, also how/if other platforms are affected - for example bsd.stand.mk does set -Os for pc98, but not for others… rgds, toomas _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
