Upload:
root@am335x-evm:~# iperf -c 192.168.1.20 -P 5 -t 60
------------------------------------------------------------
Client connecting to 192.168.1.20, TCP port 5001
TCP window size: 43.8 KByte (default)
------------------------------------------------------------
[  7] local 192.168.1.1 port 57538 connected with 192.168.1.20 port 5001
[  4] local 192.168.1.1 port 57530 connected with 192.168.1.20 port 5001
[  3] local 192.168.1.1 port 57532 connected with 192.168.1.20 port 5001
[  5] local 192.168.1.1 port 57534 connected with 192.168.1.20 port 5001
[  6] local 192.168.1.1 port 57536 connected with 192.168.1.20 port 5001
[ ID] Interval       Transfer     Bandwidth
[  6]  0.0-60.0 sec   102 MBytes  14.3 Mbits/sec
[  7]  0.0-60.0 sec   101 MBytes  14.1 Mbits/sec
[  3]  0.0-60.0 sec   102 MBytes  14.2 Mbits/sec
[  4]  0.0-60.1 sec   102 MBytes  14.3 Mbits/sec
[  5]  0.0-60.1 sec   102 MBytes  14.2 Mbits/sec
[SUM]  0.0-60.1 sec   508 MBytes  71.0 Mbits/sec

Download:
root@am335x-evm:~# iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[  4] local 192.168.1.1 port 5001 connected with 192.168.1.20 port 35632
[  5] local 192.168.1.1 port 5001 connected with 192.168.1.20 port 35634
[  8] local 192.168.1.1 port 5001 connected with 192.168.1.20 port 35640
[  7] local 192.168.1.1 port 5001 connected with 192.168.1.20 port 35638
[  6] local 192.168.1.1 port 5001 connected with 192.168.1.20 port 35636
[ ID] Interval       Transfer     Bandwidth
[  8]  0.0-60.3 sec   165 MBytes  23.0 Mbits/sec
[  4]  0.0-60.4 sec   160 MBytes  22.2 Mbits/sec
[  5]  0.0-60.4 sec   167 MBytes  23.2 Mbits/sec
[  6]  0.0-60.5 sec   163 MBytes  22.6 Mbits/sec
[  7]  0.0-60.5 sec   167 MBytes  23.2 Mbits/sec
[SUM]  0.0-60.5 sec   822 MBytes   114 Mbits/sec