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Changed manual page to conform to the reality in FreeBSD.

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David Greenman 1995-03-15 07:08:33 +00:00
parent 76f4de663a
commit 3669a02157
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=7065
1 changed files with 8 additions and 9 deletions
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sbin/tunefs/tunefs.8
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@ -87,23 +87,22 @@ this parameter should be set higher.
.It Fl m Ar minfree .It Fl m Ar minfree
This value specifies the percentage of space held back This value specifies the percentage of space held back
from normal users; the minimum free space threshold. from normal users; the minimum free space threshold.
The default value used is 10%. The default value used is 8%.
This value can be set to zero, however up to a factor of three This value can be set to zero, however up to a factor of three
in throughput will be lost over the performance obtained at a 10% in throughput will be lost over the performance obtained at a 10%
threshold. threshold. Settings of 5% and less force space optimization to
always be used which will greatly increase the overhead for file
writes.
Note that if the value is raised above the current usage level, Note that if the value is raised above the current usage level,
users will be unable to allocate files until enough files have users will be unable to allocate files until enough files have
been deleted to get under the higher threshold. been deleted to get under the higher threshold.
.It Fl o Ar optimize_preference .It Fl o Ar optimize_preference
The file system can either try to minimize the time spent The file system can either try to minimize the time spent
allocating blocks, or it can attempt to minimize the space allocating blocks, or it can attempt to minimize the space
fragmentation on the disk. fragmentation on the disk. Optimization for space has much
If the value of minfree (see above) is less than 10%, higher overhead for file writes.
then the file system should optimize for space to avoid The kernel normally changes the preference automatically as
running out of full sized blocks. the percent fragmentation changes on the file system.
For values of minfree greater than or equal to 10%,
fragmentation is unlikely to be problematical, and
the file system can be optimized for time.
.El .El
.Sh SEE ALSO .Sh SEE ALSO
.Xr fs 5 , .Xr fs 5 ,