#configure dpdk with
make config T=anlab

void PMD is an extension of null PMD with packet generating options.
e.g., --vdev eth_void0,node=0,size=64,protocol=ipv4

slow=rw, slow=r option will make vdev's RX/TX to return smaller IO batch sizes.

protocol=trace,trace=xxx.pcap replays given pcap file. uncaptured area is filled with random data (changes per every replay loop).