Question about pool(9) sizes

[Brian Buhrow <buhrow%nfbcal.org@localhost>]

        Hello.  In my continuing quest to try and get i/o performance up on
some NetBSD-5.1 production boxes I have, I find I have a question about the
minimum and maximum sizes of a specific pool.
Given the following snippet of output from vmstat -m, does the size 164,
which I realize represents the number of objects in the pool, also
represent the maximum  number of objects in the pool?  That is, if more
than 164 instances of this object are needed, would the system be unable
to provide the 165th instance or can it grow the pool to accomodate the
request?  If it does grow the pool, would the size value in vmstat -m
change?
If I've got it completely wrong, could someone elaborate?

-thanks
-Brian

Name        Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
scxspl       164 67714659    0 67714659  2101  2092     9     9     1   inf 9