Date: Thu, 30 Aug 2007 07:31:28 -0700 (PDT) From: Juri Mianovich <juri_mian@yahoo.com> To: Dag-Erling "Smørgrav" <des@des.no> Cc: freebsd-fs@freebsd.org Subject: Re: forcing a permanent "time" optimization with tunefs ? Message-ID: <113837.11318.qm@web45609.mail.sp1.yahoo.com> In-Reply-To: <86lkbtz3bi.fsf@ds4.des.no>
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--- Dag-Erling Smørgrav <des@des.no> wrote:
> Juri Mianovich <juri_mian@yahoo.com> writes:
> > I would like it to be optimized for "time"
> instead, but when I do
> > this, it almost immediately reverts back to
> "space" (with a message
> > that a filesystem with less than 8% minfree should
> be optimized for
> > space)
> >
> > But let's pretend I know better ... and I really
> do want to optimize
> > it for time - is there any way to force a
> permanent optimization for
> > "time" ?
>
> Sure, raise minfree back to 8%.
Thanks - very helpful of you.
Your annoying, useless answer aside, for the sake of
the archives I will note that 6% is the magic number,
below which the kernel will not respect your switch to
"time" optimization, but at which it will.
You will still receive a warning:
tunefs: should optimize for space with minfree < 8%
but the time optimization setting will stick, as long
as you have at least 6% minfree. This is documented
in the tunefs man page, in fact.
The answer to my original question "can I force time
optimization if I am below 6%" appears to be "no".
You can successfully set optimization to time, but the
kernel will always (almost immediately) switch it back
to space optimization.
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