freebsd stable - May 2007 - 6.2 newfs/tunefs minfree

On 6.2-STABLE,

newfs(8) manpage reports:

      -o optimization
[..snip..]
If the value of min-free (see above) is less than 8%, the default is to 
optimize for space; if the value of minfree is greater than or equal to 
8%, the default is to optimize for time.


However, tunefs(8) manpage reports:
      -m minfree
              Specify the percentage of space held back from normal 
users; the minimum free space threshold.  The default value used is 8%. 
Note that lowering the threshold can adversely affect performance:

o   Settings of 5% and less force space optimization to always be used 
which will greatly increase the overhead for file writes.


Am I correct in assuming therefore that if min-free is set to less than 
8% but optimization is set to time, the time method will still be used 
until the free space on the fs reaches 5% at which point it will force 
the 'space' method to be used?

Or, is this a mixup in the documentation?

Or, am I just reading it wrong?

Regards,

Richard
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You should find a message written by Oliver Fromme at 26-th of April 2007,
subject "Re: UFS: optimization changed". That's an answer to your
question... :)
(here's the link http://docs.freebsd.org/mail/archive/freebsd-stable.html)
> newfs(8) manpage reports:
> However, tunefs(8) manpage reports:
>      -m minfree
>              Specify the percentage of space held back from normal 
> users; the minimum free space threshold.  The default value used is 8%. 
> Note that lowering the threshold can adversely affect performance:
> 
> o   Settings of 5% and less force space optimization to always be used 
> which will greatly increase the overhead for file writes.
> 
> Or, am I just reading it wrong?

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