Just noticed this on netbsd-4, checked on i386, sparc and mac68k,
built from source about a month back:

ksh$ vmstat -m | egrep '^[A-Z]|^buf'
vmstat: Kmem statistics are not being gathered by the kernel.
Memory resource pool statistics
Name        Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
buf32k      16384     395    0      289    97    61    36    97     1     1    0
buf16k      8192      138    0       61    12     1    11    11     1     1    0
buf8k       4096        5    0        2     1     0     1     1     1     1    0
buf4k       2048      103    0       58     3     0     3     3     1     1    0
buf2k       1024      142    0       82     2     0     2     2     1     1    0
bufpl        124      688    0      397    20     0    20    20     0   inf    2
In use 6928K, total allocated 8556K; utilization 81.0%

"buf32k" has size 16k, etc? A NetBSD 3.0 system looks far more sane.
I don't have a -current system to check what it looks like there, atm.

Cheers,
-- 
Paul Ripke
Unix/OpenVMS/TSM/DBA
I love deadlines. I like the whooshing sound they make as they fly by.
-- Douglas Adams