ping 192.168.18.9 -I ib0 -c 5
PING 192.168.18.9 (192.168.18.9) from 192.168.18.5 ib0: 56(84) bytes of data.
64 bytes from 192.168.18.9: icmp_seq=1 ttl=64 time=0.636 ms
64 bytes from 192.168.18.9: icmp_seq=2 ttl=64 time=0.366 ms
64 bytes from 192.168.18.9: icmp_seq=3 ttl=64 time=0.167 ms
64 bytes from 192.168.18.9: icmp_seq=4 ttl=64 time=0.135 ms
64 bytes from 192.168.18.9: icmp_seq=5 ttl=64 time=0.120 ms

--- 192.168.18.9 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4084ms
rtt min/avg/max/mdev = 0.120/0.284/0.636/0.197 ms
[root@rds-test1 ~]#

[root@rds-test1 dtrace]# dtrace -Cqs ping_lat.d
icmp id: 14434, icmp sequence: 256, src ip: 192.168.18.5, dst ip: 192.168.18.9

routine                         delta(ns)

ip_send_skb
dev_hard_start_xmit              190382
ipoib_start_xmit                  44855
ipoib_cm_send                     84644
icmp_rcv                         322743

request-reply latency:           642624
------------------------------------------------------------------
icmp id: 14434, icmp sequence: 512, src ip: 192.168.18.5, dst ip: 192.168.18.9

routine                         delta(ns)

ip_send_skb
dev_hard_start_xmit               96159
ipoib_start_xmit                  44214
ipoib_cm_send                     44720
icmp_rcv                         173769

request-reply latency:           358862
------------------------------------------------------------------
icmp id: 14434, icmp sequence: 768, src ip: 192.168.18.5, dst ip: 192.168.18.9

routine                         delta(ns)

ip_send_skb
dev_hard_start_xmit               18217
ipoib_start_xmit                   8269
ipoib_cm_send                      8729
icmp_rcv                         129234

request-reply latency:           164449
------------------------------------------------------------------
icmp id: 14434, icmp sequence: 1024, src ip: 192.168.18.5, dst ip: 192.168.18.9

routine                         delta(ns)

ip_send_skb
dev_hard_start_xmit               12989
ipoib_start_xmit                   5900
ipoib_cm_send                      4801
icmp_rcv                         110251

request-reply latency:           133941
------------------------------------------------------------------
icmp id: 14434, icmp sequence: 1280, src ip: 192.168.18.5, dst ip: 192.168.18.9

routine                         delta(ns)

ip_send_skb
dev_hard_start_xmit               11200
ipoib_start_xmit                   4504
ipoib_cm_send                      4559
icmp_rcv                         100701

request-reply latency:           120964
------------------------------------------------------------------