​iPerf3

If iperf3 is used, multiple instances of the application are required to take advantage of the multi-threads, RSS, and hardware queues. Intel recommends running with the 2-4 application sessions for 25G connections and around 4-6 sessions for 40G connections. Each session should specify a unique TCP port value using the -p option.

• To run uni-directional traffic from client to server:

  Server command example:

  iperf3 -s -p <port>

  Client command example:

  iperf3 -c <serverIP> -p <port>
• To run bi-directional traffic from client to server (and vice versa):

  Server command example:

  iperf3 –s –p <port>

  Client command example:

  iperf3 -c <serverIP> -p <port> -P <IO_Streams> –-bidir
• To start multiple instances (threads) of iperf3, the recommendation is to use a for-loop to map threads to TCP ports and run iperf3 in the background using & to create multiple processes in parallel.

  Server command example, start 4 threads:

  port=""; for i in {0..3}; do port=520$i; bash -c "iperf3 -s -p $port &"; done;

  Client command example, start 4 threads - Transmit test

  port=""; for i in {0..3}; do port=520$i; bash -c "iperf3 -c $serverIP -p $port &"; done;

  Client command example, start 4 threads - Receive test

  port=""; for i in {0..3}; do port=520$i; bash -c "iperf3 -R -c $serverIP -p $port &"; done;

For 40G connections, increase the for-loop to create up to 6 instances/threads.