TPLink WDR3600 OpenWRT wireguard throughput benchmark

TechOverflow tested Wireguard bandwidth / throughput on the TPLink WDR3600 with OpenWRT 21.02, based on a standard iperf3 TCP benchmark. We did not use Pre-shared keys in this setup.

So far we were able to verify that the Wireguard bandwidth is approximately 27Mbit/s (unidirectional), measured using iperf3.

Connecting to host 192.168.239.254, port 5201
[  5] local 10.9.1.104 port 57502 connected to 192.168.239.254 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  3.48 MBytes  29.2 Mbits/sec    0    215 KBytes       
[  5]   1.00-2.00   sec  3.86 MBytes  32.4 Mbits/sec    0    387 KBytes       
[  5]   2.00-3.00   sec  3.13 MBytes  26.2 Mbits/sec    0    470 KBytes       
[  5]   3.00-4.00   sec  3.37 MBytes  28.3 Mbits/sec    0    470 KBytes       
[  5]   4.00-5.00   sec  3.31 MBytes  27.8 Mbits/sec    0    470 KBytes       
[  5]   5.00-6.00   sec  3.31 MBytes  27.8 Mbits/sec    0    470 KBytes       
[  5]   6.00-7.00   sec  3.31 MBytes  27.8 Mbits/sec    0    470 KBytes       
[  5]   7.00-8.00   sec  2.76 MBytes  23.1 Mbits/sec    0    470 KBytes       
[  5]   8.00-9.00   sec  3.31 MBytes  27.8 Mbits/sec    0    470 KBytes       
[  5]   9.00-10.00  sec  2.76 MBytes  23.1 Mbits/sec    0    470 KBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  32.6 MBytes  27.4 Mbits/sec    0             sender
[  5]   0.00-10.14  sec  32.0 MBytes  26.4 Mbits/sec                  receiver

During the test, top consistently showed 0% idle CPU load, with the load being approximately 51% sys and 49% sirq.

The commands in use were

iperf3 -s

on the WDR3600 and

iperf -c [IP address of WDR3600]

on the client.