Date: Sat, 28 Jan 2017 15:21:35 -0500 From: Allan Jude <allanjude@freebsd.org> To: Ngie Cooper <yaneurabeya@gmail.com> Cc: Warner Losh <imp@bsdimp.com>, Julian Elischer <julian@freebsd.org>, Toomas Soome <tsoome@me.com>, FreeBSD Current <current@freebsd.org> Subject: Re: gptzfsboot grew a lot after skein support was added; need knob to control bloat Message-ID: <891f12c6-d525-f9af-7b05-215bba875bc6@freebsd.org> In-Reply-To: <CAGHfRMDzXhauXi7r=CSih_moH0Po2K2=MGrz8sK1xmDqifPEiA@mail.gmail.com> References: <A33154F2-70E1-4047-8496-7D4D85CFF292@gmail.com> <EF719374-BF9D-44EF-9F45-53B2B506047C@me.com> <CANCZdfrzOr3YdbAKRrwUXsFDhdQ3hErf1vbYSG7MdpV_m%2B=YRQ@mail.gmail.com> <EB309E42-BEA6-49DF-BF34-172076851891@gmail.com> <f251f193-0fcd-cb2d-0fff-c443c4ca49d6@freebsd.org> <CANCZdfqdZumJvRcHGmZR_9s-ULFWsvp7h91H39o4nPgyqPBooA@mail.gmail.com> <CAGHfRMBQNSgAUGZfZQ7gD-OU4q-5sW54bdCS%2B-9_3k1ZbLu-kw@mail.gmail.com> <cea48de5-447c-bd84-c6b0-2803d00f50f9@freebsd.org> <CAGHfRMAR4XbJCae5K_XXYYzFrFjhfUVGscZ4gLhsALWouT26aw@mail.gmail.com> <373376e9-2a30-3cb4-ec60-b5b5f27de596@freebsd.org> <CAGHfRMB33A8%2B0tHQM=TUP6c-q5iTiQyRzNU9brcuQWh8hJcPwg@mail.gmail.com> <CAGHfRMDzXhauXi7r=CSih_moH0Po2K2=MGrz8sK1xmDqifPEiA@mail.gmail.com>
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From: Allan Jude <allanjude@freebsd.org>
To: Ngie Cooper <yaneurabeya@gmail.com>
Cc: Warner Losh <imp@bsdimp.com>, Julian Elischer <julian@freebsd.org>,
Toomas Soome <tsoome@me.com>, FreeBSD Current <current@freebsd.org>
Message-ID: <891f12c6-d525-f9af-7b05-215bba875bc6@freebsd.org>
Subject: Re: gptzfsboot grew a lot after skein support was added; need knob to
control bloat
References: <A33154F2-70E1-4047-8496-7D4D85CFF292@gmail.com>
<EF719374-BF9D-44EF-9F45-53B2B506047C@me.com>
<CANCZdfrzOr3YdbAKRrwUXsFDhdQ3hErf1vbYSG7MdpV_m+=YRQ@mail.gmail.com>
<EB309E42-BEA6-49DF-BF34-172076851891@gmail.com>
<f251f193-0fcd-cb2d-0fff-c443c4ca49d6@freebsd.org>
<CANCZdfqdZumJvRcHGmZR_9s-ULFWsvp7h91H39o4nPgyqPBooA@mail.gmail.com>
<CAGHfRMBQNSgAUGZfZQ7gD-OU4q-5sW54bdCS+-9_3k1ZbLu-kw@mail.gmail.com>
<cea48de5-447c-bd84-c6b0-2803d00f50f9@freebsd.org>
<CAGHfRMAR4XbJCae5K_XXYYzFrFjhfUVGscZ4gLhsALWouT26aw@mail.gmail.com>
<373376e9-2a30-3cb4-ec60-b5b5f27de596@freebsd.org>
<CAGHfRMB33A8+0tHQM=TUP6c-q5iTiQyRzNU9brcuQWh8hJcPwg@mail.gmail.com>
<CAGHfRMDzXhauXi7r=CSih_moH0Po2K2=MGrz8sK1xmDqifPEiA@mail.gmail.com>
In-Reply-To: <CAGHfRMDzXhauXi7r=CSih_moH0Po2K2=MGrz8sK1xmDqifPEiA@mail.gmail.com>
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On 2017-01-28 15:17, Ngie Cooper wrote:
> On Sat, Jan 28, 2017 at 11:22 AM, Ngie Cooper <yaneurabeya@gmail.com> w=
rote:
>>> What created a partition that small?
>>
>> Me.
>>
>> gpart up until last summer said that users should create 44kB
>> freebsd-boot partitions -- des@ corrected that in r303289:
>>
>> -This example uses 88 blocks (44 kB) so the next partition will be
>> -aligned on a 64 kB boundary without the need to specify an explicit
>> -offset or alignment.
>> -The boot partition itself is aligned on a 4 kB boundary.
>> +We create a 472-block (236 kB) boot partition at offset 40, which is
>> +the size of the partition table (34 blocks or 17 kB) rounded up to th=
e
>> +nearest 4 kB boundary.
>> .Bd -literal -offset indent
>> -/sbin/gpart add -b 40 -s 88 -t freebsd-boot ada0
>> +/sbin/gpart add -b 40 -s 472 -t freebsd-boot ada0
>=20
> After some creative hacking... tada!
>=20
> # find /usr/obj/usr/src/sys/boot/ -type f -name \*zfsboot -exec ls -l {=
} \;
> -rw-r--r-- 1 root wheel 131584 Jan 28 12:07
> /usr/obj/usr/src/sys/boot/i386/zfsboot/zfsboot
> -rw-r--r-- 1 root wheel 47527 Jan 28 12:07
> /usr/obj/usr/src/sys/boot/i386/gptzfsboot/gptzfsboot
>=20
> -- wait, why is the size of zfsboot vs gptzfsboot so different? Oh,
> r304321 added that as `BOOT2SIZE`. Still, it seems a bit silly to only
> increase the size of one bootloader and not the other 4 instances of
> the bootloader :/. I don't understand the point in the size
> restriction 100%, but I'll leave it be.
>=20
> Patch will be available sometime next week if my testing goes well.
>=20
> Cheers,
> -Ngie
>=20
The 'zfsboot' version, is dd's into the zfs boot code area. It is read
by the assembly code there. It is important the file be the size that
will be read, so it is padded out. That file is currently only used for
MBR booting from ZFS.
--=20
Allan Jude
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