Allocate frisbee buffers based on memory size
Allocate frisbee buffers based on memory size

Try to use as much memory as we can for frisbee's buffers.  The amount
we try to allocate is based on the amount of installed memory, so it
will vary from system to system.

nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome