​netperf

The netperf tool is strong choice for both throughput and latency testing.

• The TCP_​STREAM test in netperf measures the throughput capabilities of the device.

  Server command example:

  netserver

  Client command example:

  netperf -t TCP_STREAM -l 30 -H <serverIP>

• The TCP_​RR test in netperf returns latency in a value of transactions/second. This is a round-trip number. It is recommended to use the -T x,x option, were x is CPU local to the device.

  The one-way latency can be calculated using: Latency(usec)=(1⁄2)/[Transactions/sec]*1,000,\

  Server command example: netserver

  Client command example:

  netperf -t TCP_RR -l 30 -H <serverIP> -T x,x

• To start multiple instances (threads) of netperf, the recommendation is to use a for-loop to map threads to TCP ports and run netperf in the background using & to create multiple processes in parallel.

  Server command example, start 8 threads:

  port=""; for i in {0..7}; do port=520$i; bash -c "netserver -L $serverIP -p $port &"; done;

  Client command example, start 8 threads:

  port=""; for i in {0..7}; do port=520$i; bash -c "netperf -H $serverIP -p $port -t TCP_STREAM -l 30 &"; done;