Date: Thu, 23 Jan 2020 12:05:19 +0800 From: Ben Woods <woodsb02@gmail.com> To: Mark Millard <marklmi@yahoo.com> Cc: freebsd-arch <freebsd-arch@freebsd.org> Subject: Re: svn commit: r356758 - in head/usr.sbin/bsdinstall: . scripts Message-ID: <CAOc73CAt83ZcEDt_m3iBwEHKBWxaeOmbshwGrATx%2BGe_VU65Nw@mail.gmail.com> In-Reply-To: <6C674E9A-5946-4424-AEA1-689D2DA3C256@yahoo.com> References: <6C674E9A-5946-4424-AEA1-689D2DA3C256.ref@yahoo.com> <6C674E9A-5946-4424-AEA1-689D2DA3C256@yahoo.com>
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On Thu, 23 Jan 2020 at 8:58 am, Mark Millard <marklmi@yahoo.com> wrote: > Ben Woods woodsb02 at gmail.com write on > Thu Jan 23 00:07:13 UTC 2020 : > > > Before I commit phabricator review D23224, is there any final comments? > > > > Particularly on these 2 lines of help-text: > > msg_partitioning_zfs_help=3D"ZFS is recommended if you have at least 4G= B > RAM" > > msg_partitioning_ufs_help=3D"UFS is recommended if you have less than 4= GB > of > > RAM" > > > > There is some disagree about what these 2 recommendations should be. > > > > 4GB was recommended by: imp, emaste, philip, eugen, dteske > > 8GB was recommended by: mike > > 16GB was recommended by: cem > > > > The 4GB limit seems to have the best consensus, however there was some > > debate about whether ZFS is recommended on a system with 4GB, or only > > systems with MORE THAN 4GB. > > What of uSD card based systems (for example small ARM boards)? > Does the typical performance characteristics of the uSD cards > (such as large latencies) have ZFS consequences to avoid? The ZFS install option is only presented on amd64, i386, arm64 systems. https://github.com/freebsd/freebsd/blob/e8ec070d82b84afb3817e1bc76b4eeebfdb= 6ce0f/usr.sbin/bsdinstall/scripts/auto#L291 I suspect most small arm boards are still typically 32bit arm? However, that doesn=E2=80=99t preclude there being small arm64 boards (now or in the future...). More > generally: is there anything besides RAM that has enough use but > also has good reason to contribute to a potential choice to > avoid ZFS? (I've no clue of uSD card use makes a good example or > not, but I wanted something to illustrate the general question.) Perhaps the help text should instead include a link to the ZFS tuning guide that includes any and all considerations? I do like the choice to just add some quick notes to read > instead of detecting and adjusting defaults. > > [This may not make it to freebsd-arch: it is historically rare > that I'd comment there and so I've not tried to be added. > Anything I submit there goes through a moderator and I've > never objected when one of those rare ones did not go > through.] > > > As for the ZFS auto-tuning, I see that as being a separate discussion > > (which could ultimately change this recommendation, but shouldn't preve= nt > > us from committing this help text now). > > > > =3D=3D=3D > Mark Millard > marklmi at yahoo.com > ( dsl-only.net went > away in early 2018-Mar) Cheers, Ben > -- -- From: Benjamin Woods woodsb02@gmail.com
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