127.0.0.1 PING 延迟.

$ ping 127.0.0.1
PING 127.0.0.1: (127.0.0.1): 56 data bytes
64 bytes from 127.0.0.1: icmp_seq=0 ttl=255 time=22 ms
64 bytes from 127.0.0.1: icmp_seq=1 ttl=255 time=13 ms
64 bytes from 127.0.0.1: icmp_seq=2 ttl=255 time=12 ms
64 bytes from 127.0.0.1: icmp_seq=3 ttl=255 time=15 ms收起