Growth in pool usage between netbsd-9 and -10?

[Paul Ripke <stix%stix.id.au@localhost>]

I recently upgraded my netbsd-9 amd64 w 16GiB RAM to netbsd-10. Which, btw,
feels much "snappier", anecdotally.
After running a few builds and whatnot, I chased down where all my RAM was
going. Manually sorted:

Memory resource pool statistics
Name        Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
buf2k       2048   399771    0    97706 164994 11676 153318 164983  0   inf  106
vcachepl     640  1412222    0   612635 183127 39581 143546 183127  0   inf    0
ffsino       280  1440870    0   641796 78452 14088 64364 78452     0   inf    0
ffsdino2     264  1445733    0   646660 73222 13218 60004 73222     0   inf    0
namecache    192  1257514    0   444866 39817     2 39815 39817     0   inf    0
buf16k      16896  177282    0    71409 35542   250 35292 35292     0   inf    1
bufpl        280   425741    0    12096 30334   490 29844 30334     0   inf    0
anonpl        40  4816174    0  3570206 24466     2 24464 24466     0   inf    0
rwlock        64  1649569    0   753596 18923  2298 16625 18923     0   inf    0
mutex         64  1337583    0   537463 17451  1218 16233 17451     0   inf    0
dirhashblk  2048    30827    0     2014 15238   732 14506 15238     0   inf   64
radixnode    192   393557    0   273821 10589  1303  9286 10589     0   inf   12
pvpage      4096    14790    0     7333 10066  2131  7935  8964     0   inf  478
kmem-01024  1088    39226    0    20445  9647  3150  6497  8117     0   inf    0
vmmpepl      192   213489    0   122047  6626  1562  5064  5625     0   inf   10
kmem-02048  2048    22881    0    12785  8394  3346  5048  6698     0   inf    0
mclpl       2048    33126    0    24568  5514  1211  4303  4390     0 261333  24
buf4k       4096     7619    0     4102  3884   366  3518  3838     0   inf    1
phpool-64     64   215806    0    22397  3283    64  3219  3283     0   inf    4
mbpl         520    76469    0    58519  3265   520  2745  2795     0   inf    2
...
Totals           177503409   0 169479744 816744 149009 667735

In use 4025485K, total allocated 4834772K; utilization 83.3%

That seems a little excessive, to my eye? Is this "normal"? Having >1/4 of RAM
apparently used mostly for file metadata, if I'm reading this correctly? I
don't recall the usage under -9, unfortunately, but I also never had a reason
to look.

I do set 'kern.maxfiles=40960', and also tweak 'vm.{anon,file}{min,max}', but,
afaict, nothing else relevant.

fwiw, this is a single raid0 over a couple of wd, all ffsv2, no zfs.

Actually, looking again... this is my only system with such a large
buf2k... what commonly allocates from that pool?

-- 
Paul Ripke
"Great minds discuss ideas, average minds discuss events, small minds
 discuss people."
-- Disputed: Often attributed to Eleanor Roosevelt. 1948.