FreeBSD/ZFS on [HEAD] chews up memory

[grarpamp]

> RAM amount might matter too. 12GB vs 32GB is a bit of a difference.

Allow me to botch hypothetically...

We, and I, get that some FS need memory, just like kernel and
userspace need memory to function. But to be honest, things
should fail or slow gracefully. Why in the world, regardless of
directory size, should I ever need to feed ZFS 10GB of RAM?
Notice I snuck in 2GB of that 12-32GB for kernels and users own
bloat. Yeah ok, I get FFS DIRHASH, if I don't feed it I simply get
a performance hit, not a crash. But 12+ efling GB for ZFS and 80-90%
free or the system crashes hard? W t F people?!?!?! Where have we
gone wrong with this design? Where are the BSD principles???
I know I don't have a lot of time to characterize this RAM issue,
and I don't ascribe it to this case, but I say this because we often
keep seeing "add more ram" as the first/common fix, well that's
not a real BSD solution. Keep on BSD solutions and ZFS and
all the rest will continue to be good. Cheers, mates :)