This package measure your network card can handle how much packet per a second.
go get github.com/batuberksahin/network-speed-test
cd $GOPATH/src/github.com/batuberksahin/network-speed-test
go run main.go -f [pcap destination]
$ go run main.go -f test.pcap
PCAP took 4m43.466932s
136.31 packet per second
Average packet length is 169.95