Date: Sat, 22 Feb 2003 18:12:47 +0100 From: Roman Neuhauser <neuhauser@bellavista.cz> To: "Brian T. Schellenberger" <bts@babbleon.org> Cc: Alistair Phillips <file13@rentboy.co.za>, FreeBSD Questions <freebsd-questions@rentboy.co.za> Subject: Re: SoftUpdates on / Message-ID: <20030222171247.GV329@freepuppy.bellavista.cz> In-Reply-To: <200302211452.45685.bts@babbleon.org> References: <001401c2d9aa$a10d5b30$2502100a@alistairp> <200302211452.45685.bts@babbleon.org>
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# bts@babbleon.org / 2003-02-21 14:52:45 -0500:
> the reason that they disabled by default on / is almost
> certainly because the / is usually *small*, not large.
thus spoke Terry Lambert in
Message-ID: <3E4B429D.5DCFB0E9@mindspring.com>:
: I believe the reason it's not "on" in sysinstall is that sysinstall
: tries to mount things async on the initial install, so that doing
: things like unpacking ports doesn't take forever. If it fails, you
: can just restart, and having to do that a couple of times is still
: faster than waiting for ordered metadata.
: The technical reason that it doesn't do it is that the mount update
: is not logically an "unmount without destroying vnodes(inodes) in
: core, with a remount with the new options". The main reason for
: that is that the dependencies go all the way to the buffer cache,
: and the backing vnode (e.g. the "raw" device) that's mounted does
: not necessarily get its buffers flushed. Basically, you'd have to
: put a little more work into the "mount update" code.
: This was discussed a long time ago on -arch, when soft updates
: first came into FreeBSD, and then again every 18 months or so,
: ever after. See Kirk's postings on the subject, if you don't
: want to take mine for it.
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