iperf is a TCP and UDP bandwidth performance measurement tool.
iperf3
iperf3 is the latest incarnation of the iperf tool, and is hosted at https://code.google.com/p/iperf/. It can nominally be built for various platforms, amongst them, Linux and RTEMS. Unfortunately, iperf3 requires a more modern networking stack than that is currently (Dec. 2013) included with 4.11 RTEMS distribution. So, for RTEMS, see iperf2, below.
The Linux build is installed in the DAT group space at /afs/slac/g/cci/, with the source code in packages/. The binary and library can be found in /afs/slac/g/cci/bin and lib, resp.
To build iperf, see the README and INSTALL files in the iperf root directory. For Linux, I used the sequence:
cd /afs/slac/g/cci/package/iperf3 mkdir linux cd linux ../configure --prefix /afs/slac/g/cci make make install
The choice of the prefix argument indicates that the results should be installed in the /afs/slac/g/cci area, rather than in the /usr/local area. In /afs/slac/g/cci/bin you can find the main program iperf3, for example. Run iperf3 --help to see the choice of options, but basically, the idea is to run one instance on one machine in server mode (iperf3 -s), and another instance on a different machine in client mode (iperf3 -c).
iperf2
This older version of the iperf tool is hosted at http://iperf.sourceforge.net/. It doesn't seem to be entirely dead, since the latest version (2.0.5) was placed there on June 12, 2013.
For Linux, the sequence is the same as for iperf3:
cd /afs/slac/g/cci/package/iperf2 mkdir linux cd linux ../configure --prefix /afs/slac/g/cci make make install
For RTEMS, TBD.