hping3 rtt >> sockperf latency

I tried to run tcp hping3
sudo hping3 -S -p 22 10.1.0.8 -c 5
HPING 10.1.0.8 (eth0 10.1.0.8): S set, 40 headers + 0 data bytes
len=44 ip=10.1.0.8 ttl=64 DF id=0 sport=22 flags=SA seq=0 win=29200 rtt=1.6 ms
len=44 ip=10.1.0.8 ttl=64 DF id=0 sport=22 flags=SA seq=1 win=29200 rtt=3.9 ms
len=44 ip=10.1.0.8 ttl=64 DF id=0 sport=22 flags=SA seq=2 win=29200 rtt=6.0 ms
len=44 ip=10.1.0.8 ttl=64 DF id=0 sport=22 flags=SA seq=3 win=29200 rtt=4.4 ms
len=44 ip=10.1.0.8 ttl=64 DF id=0 sport=22 flags=SA seq=4 win=29200 rtt=11.9 ms

--- 10.1.0.8 hping statistic ---
5 packets transmitted, 5 packets received, 0% packet loss
round-trip min/avg/max = 1.6/5.5/11.9 ms

If I measure latency using sockperf tool avg latency is getting ~ 0.5ms
(sockperf.bin ping-pong -i 10.1.0.8 -p 8302 -t 15 --pps=max )

Does internal way of measuring tcp rtt from hping3 and tcp latency from sockperf same?
Am I doing anything wrong here?
Could you please help with this issue?