root@stbppc:/home/jones/dpdk-stable-18.05.1/build/app# ./testpmd -c7 -n3         --vdev=net_pcap0,iface=eth0 --vdev=net_pcap1,iface=eth1 -- -i --nb-cores=2 --nb-ports=2 --total-num-mbufs=2048
EAL: Detected 4 lcore(s)
EAL: Detected 1 NUMA nodes
ERROR: failed to parse device "net_pcap0"
EAL: Unable to parse device 'net_pcap0,iface=eth0'
PANIC in main():
Cannot init EAL
5: [./testpmd(_start+0x29) [0x47abf9]]
4: [/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0) [0x7f3d6e33b830]]
3: [./testpmd(main+0xaa8) [0x475118]]
2: [./testpmd(__rte_panic+0xc3) [0x46bf80]]
1: [./testpmd(rte_dump_stack+0x2b) [0x53971b]]
Aborted (core dumped)