If memory serves me right, Mohanraj B wrote: > Hello Bruce, > > Thanks for the response. > Yes, had a look at those manual. > > I want to verify the option I am trying to use during the test > actually do what its intended to do. > Have used --pacing-timer [1k to 100k] range, dont see any difference > in the bit rate. > Also for the option --zerocopy and --udp-counters-64bit, how to > validate this option has worked for my test.
Well...it depends on what test you are trying to run. --udp-counters-64bit only affects UDP. It makes iperf3 use 64-bit sequence numbers in the test packets rather than 32-bit sequence numbers. This can be useful in high-packet-rate or long-running tests, which can overflow a 32-bit sequence number space. There is no effect on TCP or SCTP tests. I don't believe there would be any significant performance effect. --zerocopy only affects TCP tests...it's a way of sending data that is supposed to be less processor-intensive than just writing bytes out to a socket. No effect on the receiver side. --pacing-timer controls the granularity of iperf3's timers that are used for pacing traffic (when the --bandwidth parameter is used). Larger values here reduce overheads, but result in more bursty traffic, which can create losses particularly with UDP tests. Less of an effect with TCP because the traffic has to go through TCP's flow control and congestion control algorithms. Hope this helps, Bruce. > On 9/13/18, Bruce A. Mah <b...@es.net> wrote: >> If memory serves me right, Mohanraj B wrote: >> >>> Can anyone shed light on how to see the effect of using the options >>> *--zerocopy, --udp-counters-64bit and --pacing-timer* in iperf3. >>> >>> So far tried these options but quiet not sure how it's act on the >>> traffic. >>> >>> I have 2 directly connected ubuntu machines running iperf3. >> >> Well, you could try looking at the manual page. "man iperf3" if it's >> installed. If not you can try the on-line version at: >> >> http://software.es.net/iperf/invoking.html#iperf3-manual-page >> >> If you've read one of those and have specific questions, feel free to >> write back. >> >> Thanks, >> >> Bruce. >> >> >>
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