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Date:      Sun, 29 Mar 2015 21:52:03 -0600
From:      Warner Losh <imp@bsdimp.com>
To:        Garrett Cooper <yaneurabeya@gmail.com>
Cc:        "freebsd-testing@freebsd.org" <freebsd-testing@freebsd.org>, Roman Divacky <rdivacky@freebsd.org>, FreeBSD Toolchain <freebsd-toolchain@freebsd.org>, Dimitry Andric <dim@freebsd.org>
Subject:   Re: Fails to build sys/i386/boot2 with gcc 4.9
Message-ID:  <CA131BFF-A2F9-4432-ADC7-4391E498B876@bsdimp.com>
In-Reply-To: <32F42F43-0AFA-4562-B845-4612D123742E@gmail.com>
References:  <CAG=rPVcXPMqifAJvg_-XNWrOUzDLya1UMWW5KMymymyayM25=w@mail.gmail.com> <20683705-0EBA-4B8F-A0CE-9C06B8003BBE@FreeBSD.org> <20150329082734.GA13058@vlakno.cz> <B6DB2849-2985-4658-AD13-E9E99E8BE731@bsdimp.com> <CAG=rPVf5AwjjjLL-xkv%2BbAaX4CHaoB5iwF9nD59GuVc3qGo64g@mail.gmail.com> <7A9A90EA-E052-425E-BE90-9290B0CAB03F@bsdimp.com> <32F42F43-0AFA-4562-B845-4612D123742E@gmail.com>

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> On Mar 29, 2015, at 6:37 PM, Garrett Cooper <yaneurabeya@gmail.com> =
wrote:
>=20
>>=20
>> On Mar 29, 2015, at 15:56, Warner Losh <imp@bsdimp.com> wrote:
>>=20
>>> On Mar 29, 2015, at 2:29 PM, Craig Rodrigues <rodrigc@FreeBSD.org> =
wrote:
>>>=20
>>> On Sun, Mar 29, 2015 at 11:04 AM, Warner Losh <imp@bsdimp.com> =
wrote:
>>>=20
>>> 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.
>>>=20
>>> 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=81ft =
have
>>> to add boot blocks into the mix.
>>>=20
>>> 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=81fre not going to debate here: they are still real).
>>>=20
>>> 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.
>>>=20
>>> Just out of curiousity, what is it about newer compilers that cause
>>> the size of boot2 to increase so much?
>>>=20
>>> 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? :)
>>=20
>> Removing printf isn=81ft going to save us. It usually compiles to =
80-120 bytes.
>>=20
>> 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.
>=20
> 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=81ft in boot2 by default, just ufs1 and ufs2, so I on=81ft =
understand the question.

Warner


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