Hello and sorry for my english

I read to ClusterXL:

"for set parameters using fw ctl set int ..."

#fw ctl get int fwhmem

fwhmem = 16777216

OK!

#fw ctl get int sending_queue_size

get: Operation failed: Invalid argument

oops. Where can I get a valid arguments ? Manual write down: sending_queue_size and recv_queue_size...