iperf3 and iperf (v2) is supported for VOLIA subscribers only
$ iperf3 -c iperf3.volia.com -R -P 4
Please visit iperf3 homepage for details.
$ iperf -c iperf.volia.com -r -P 4
See iperf documentation for details.
Or visit its homepage.
Version of at least 2.0.5 is required for bidirectional (upload/download) test to work.
Love GUI? Windows user? Try jPerf.
You'll need Oracle/Sun Java Runtime Environment.