The UDP latency assumes the two clocks are synchronized. The GPS atomic clocks are suggested as a common reference. IEEE 1588 or Precision Time Protocol (PTP) is suggested (over things like network time protocol NTP) to distribute a reference clock. For a bench test environment one could use the clock on a device and distribute it to the other using(s) PTP. A final option is to use your own local oscillator and distribute that. I use oven controlled oscillators (OCXO) by spectracom, e.g. their tsync pcie cards.
Note: In 2.0.14, currently under development, these values will own show up if the --trip-times option is set on the client. This basically indicates to iperf that the user is claiming the clocks have somehow been synchronized. There are a bunch more latency related features as well. videos can be found here <https://www.youtube.com/channel/UCaqlH3a442xaZ9humrxRHGQ/> Bob On Thu, Apr 16, 2020 at 10:35 AM Andrew Morcos <andrewmor...@outlook.com> wrote: > Hello everyone, > > I have a question concerning how Iperf can determine some values. > So when using Iperf for capturing network information such as throuput, > packets loss etc.. There's an option "-e" that gives as an output the > LATENCY as well (average/max/min RTT). It works as well for UDP packets. > Does anyone know how could Iperf measure LATENCY for UDP packets since UDP > packets are unacknowledged? > > Thank you. > > Andrew Morcos > > > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon> > Virus-free. > www.avast.com > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=link> > <#m_3408531035212424192_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> > _______________________________________________ > Iperf-users mailing list > Iperf-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/iperf-users >
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