5 January 2015 - IPERF for Windows with User Interface and Charts released. Native Win32 port (not Cygwin) with QoS (DSCP set). Free download of trial version is available.
IPERF is a professional bandwidth test tool for qualifying performance of corporate networks and the Internet. Both versions: interactive graphical and command-line for batch operations are provided.
Check out the videos below for IPERF Charts with UI and command-line version.
"The program is working very well. I'm testing a DOCSIS 3.0 cable modem in an 8x4 channel bonded mode. I'm able to get ~300Mbps downstream and ~100Mbps upstream without errors."
Cisco Systems Inc