Iperf 2.0.14 supports write to read trip times for both TCP and UDP https://youtu.be/LOGpXiAk_cc Bob On Thu, May 28, 2020 at 7:22 AM Tim Higgins wrote: > Hi Bob, > > Thanks for the suggestions. The iper2 suggests are for UDP, correct? > > As I said in the article, I'm done hunting this snark for now. Maybe > others will take up the challenge. > =========== > Tim > On 5/27/2020 1:16 PM, Bob McMahon wrote: > > I would make a small packet run too. For iperf2 use -l 40 and -b 20000pps > and vary the pps number. I would hope that OFDMA would increase this. > > Also, don't forget about jitter - the derivative of latency. Some > protocols care more about jitter than they do latency. > > I'd look into measuring the actual latency and jitter of the traffic vs > using a ping as a proxy. This will be supported in iperf 2.0.14 using the > write (server) side clock and --write-ack. Better though is to synchronize > the clocks and use one way trip times. While I like to synchronize the > realtime clocks to the GPS atomic clock as the reference, using PTP and > synchronizing to a common reference of any PC oscillator may be good > enough. PTP stats will give you errors and corrections and per the > corrections one can get an idea of the error. > > Thanks for posting. I really don't think OFDMA is going to affect such > large latencies in a noticeable manner. I think it will be the ultra low > latencies or near zero queuing that will matter. For data center switches > this is driven mostly by high frequency traders. For WiFi it's going to be > newer games with VR/AR. Those latencies are going to need to be very low > compared to today's use cases. > > my $0.02, > > Bob > > On Wed, May 27, 2020 at 7:37 AM Tim Higgins > wrote: > >> Tests have been redone and article is back up. >> =========================== >> Hi All, >> >> This article uses the benchmark test described in Part 1 to test 6 Wi-Fi >> consumer routers. Results are not impressive. >> >> https://www.smallnetbuilder.com/wireless/wireless-features/33223-does-ofdma-really-work-part-2 >> >> =========== >> Tim >> _______________________________________________ >> Make-wifi-fast mailing list >> Make-wifi-fast@lists.bufferbloat.net >> https://lists.bufferbloat.net/listinfo/make-wifi-fast > > >