setting kern.ipc.maxsockbuf above MB errors with "Result too large"

Hi

I'm running Snow Leopard 10.6.4 on a machine that has 16GB memory.
When I attempt to increase the kern.ipc.maxsockbuf above 4MB I get an error that states "Result too large". I don't have this problem on my 10.5 machines. Anyone know where this limitation comes from? Is it some hard limit on Smow Leopard?

Regards - Tim

# setting to 4MB works fine.

sudo sysctl -w kern.ipc.maxsockbuf=4194304

kern.ipc.maxsockbuf: 500000 -> 4194304

# setting to 1 above 4MB starts the error.

sudo sysctl -w kern.ipc.maxsockbuf=4194305

kern.ipc.maxsockbuf: 4194304
sysctl: kern.ipc.maxsockbuf: Result too large