Re: gptzfsboot grew a lot after skein support was added; need knob to control bloat

On Sat, Jan 28, 2017 at 10:57 AM, Allan Jude <allanjude_at_freebsd.org> wrote:
> On 2017-01-28 13:56, Ngie Cooper wrote:
>> On Sat, Jan 28, 2017 at 8:56 AM, Warner Losh <imp_at_bsdimp.com> wrote:
>>
>> ...
>>
>>> So? It literally doesn't matter where the freebsd-boot partition
>>> lives, or what it's number is. You can put it at the start or end of
>>> the swap partition after adjusting its size. I've done this on several
>>> systems...  NanoBSD plays games with this stuff as well to be bootable
>>> on old / new systems.
>>
>> True. Hopefully my BIOS/disk controller isn't dumb enough to not
>> support large disks properly.
>>
>> *sigh* Unfortunately, in my infinity cleverness I only put 2
>> partitions on the drive -- freebsd-boot and freebsd-zfs. I guess I'll
>> need to make backups of my workstation so I don't lose anything
>> critical.
>
> Did gptzfsboot not fall below 64kb when you used the
> LOADER_NO_GELI_SUPPORT knob?

It did, but unfortunately that's still way too small for my
freebsd-boot partition (which apparently is only 44kB large :/..):

Before:

$ ls -l `make -V.OBJDIR`/gptzfsboot
-rw-r--r--  1 ngie  wheel  111662 Jan 28 11:00
/usr/obj/usr/src/sys/boot/i386/gptzfsboot/gptzfsboot

After:

$ ls -l `make -V.OBJDIR`/gptzfsboot
-rw-r--r--  1 ngie  wheel  65371 Jan 28 11:05
/usr/obj/usr/src/sys/boot/i386/gptzfsboot/gptzfsboot

Time to do some more tricks to pare down the bootloader size.

Sidenote to the folks who drive the release notes and upgrade
instructions for FreeBSD 12.x -- it needs to be clearly explained that
gptzfsboot has grown considerably in size and mitigation instructions
should be provided for updating gptzfsboot -- in particular with folks
who might be using freebsd-update, so don't have the luxury of the
choice of bootloader build options when upgrading.

Thanks,
-Ngie

$ gpart list da0
Geom name: da0
modified: false
state: OK
fwheads: 255
fwsectors: 63
last: 250069646
first: 34
entries: 128
scheme: GPT
Providers:
1. Name: da0p1
   Mediasize: 45056 (44K)
   Sectorsize: 512
   Stripesize: 0
   Stripeoffset: 20480
   Mode: r0w0e0
   rawuuid: 29a79300-48b1-11e4-97ff-fc4dd43f2de9
   rawtype: 83bd6b9d-7f41-11dc-be0b-001560b84f0f
   label: (null)
   length: 45056
   offset: 20480
   type: freebsd-boot
   index: 1
   end: 127
   start: 40
2. Name: da0p2
   Mediasize: 128035593728 (119G)
   Sectorsize: 512
   Stripesize: 0
   Stripeoffset: 65536
   Mode: r1w1e1
   rawuuid: 4416180d-48b1-11e4-97ff-fc4dd43f2de9
   rawtype: 516e7cba-6ecf-11d6-8ff8-00022d09712b
   label: (null)
   length: 128035593728
   offset: 65536
   type: freebsd-zfs
   index: 2
   end: 250069646
   start: 128
Consumers:
1. Name: da0
   Mediasize: 128035676160 (119G)
   Sectorsize: 512
   Mode: r1w1e2