On Mon, 29 Feb 2016, Michal Kazior wrote:

Our intent is to continue to improve the flent test suite to be able
to generate repeatable tests, track relevant wifi behaviors and pull
relevant data back, graphed over time (of test) and time (over test
runs). A problem with udp flood tests is that tcp traffic is always
bidirectional (data vs acks), so a naive thought would be, that yes,
you should get half the bandwidth you get with a udp flood test.

I don't see why you'd be doomed to get only half the bandwidth because
of that? Sure, Wi-Fi is half-duplex but transmit time for ACKs is a
lot smaller than transmit time for the data.

The difference is actually far less than you think. Each transmission has a fixed-length header and quiet times that were designed in the days of 802.11b (1-11Mb) and if you are transmitting a wide 802.11ac signal at a couple hundred Mb, you can find that the time taken to transmit even full packets is a surprisingly small percentage of the total transmit time.

David Lang