any restrictions on nmbclusters vs nmbjumbop

[Joe Schaefer]

I have the following config in boot/loader.conf

kern.ipc.nmbclusters="65536"
kern.ipc.nmbjumbop="65536"

and having just tried running a host with that config
the host stopped responding to commands (not even login
worked) and I had to power cycle it.

My situation is that I have a need for a large nmbjumbop setting
but the nmbclusters size (according to netstat -m) can remain small.
Is this possible or do I need to bump the nmbclusters to 128K
in order to get nmbjumbop where I want (64K)?