Date: Tue, 28 Aug 2007 07:25:48 -0700 (PDT) From: Juri Mianovich <juri_mian@yahoo.com> To: freebsd-fs@freebsd.org Subject: Re: minfree 1 -> 0 -> 1 == death ... PLEASE HELP Message-ID: <60619.41746.qm@web45615.mail.sp1.yahoo.com>
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> > All I want to know is, how do I get back the old
> > minfree of 1 I had 24 hours ago instead of the
"new
> > and improved" minfree of 1 that I have now ?
>
> Can you try doing:
>
>
> tunefs -o time /dev/aacd0s1e
>
> and then mounting it?
Yes, that was my first instinct, in fact.
I can do that, but I am given a warning that
filesystems with less than 8% minfree should be
optimized for space.
After using the filesystem for 10-20 minutes the
kernel reverts optimization back to space, even if I
explicitly optimize the filesystem for time.
So it appears that you cannot force the filesystem to
remain optimized for time.
Do you know of a way to keep a filesystem optimized
for time ? I would like to try running that way. I
am currently running with this filesystem mounted, but
mounted read-only, and the system is stable that way.
Two things I want to try are:
- forcing a perm. time optimization, if someone knows
how to do that
- freeing up enough space to get back to 5 or 8%
minfree and seeing if it behaves better with that.
But what I would like to know is, is it _known_ that
it is more complicated (or perhaps impossible ?) to
climb back out of a minfree hole ? Should it be
considered a one way move ? Or should I expect to
increase and decrease minfree, trading space for
performance in whichever direction I am currently
moving ?
My results seem to suggest it is a one way move, and
that you can't expect to regain performance by going
back in a positive direction.
Comments ?
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