What need to be done to tune networking stack (WIP) End host Tunables hw.igb.max_interrupt_rate - loader tunable limiting maximum number of interrupts per second generated by single igb(4)-driven NIC. Default value is 8000 and is too low; you may want to increase it upto 32000 or more. net.inet.tcp.tcbhashsize - loader tunable and read-only sysctl, size of hash used to find socket for incoming pac