I was noticing that the dmesg output for one of my boxes suggests it's using
less buffer cache than I turn out to want.  In old-VM, I believe this was
addressed with something like
	options "BUFMEM=\(32*1024*1024\)"
(actually stolen from a BSD/OS config file of some time ago, but you get the
idea).

How do you hint at this for modern UVM?

-s