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<font size="-1" face="Times New Roman, Times, serif">Hi Bob,<br>
<br>
Thanks for the suggestions. The iper2 suggests are for UDP,
correct?<br>
<br>
As I said in the article, I'm done hunting this snark for now.
Maybe others will take up the challenge.<br>
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<div><font size="-1" face="Times New Roman, Times, serif">===========<br>
Tim <br>
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<div class="moz-cite-prefix">On 5/27/2020 1:16 PM, Bob McMahon
wrote:<br>
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<blockquote type="cite"
cite="mid:CAHb6LvpM-SZROBZhF-g22OiOd9AxV-UZouBZ7E45yjApODDTwg@mail.gmail.com">
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<div dir="ltr">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. <br>
<br>
Also, don't forget about jitter - the derivative of latency.
Some protocols care more about jitter than they do latency. <br>
<br>
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.<br>
<br>
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.<br>
<br>
my $0.02,<br>
<br>
Bob</div>
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<div dir="ltr" class="gmail_attr">On Wed, May 27, 2020 at 7:37
AM Tim Higgins <<a href="mailto:tim@smallnetbuilder.com"
moz-do-not-send="true">tim@smallnetbuilder.com</a>>
wrote:<br>
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0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div> <font size="-1" face="Times New Roman, Times, serif">Tests
have been redone and article is back up.<br>
===========================<br>
Hi All,<br>
<br>
This article uses the benchmark test described in Part 1
to test 6 Wi-Fi consumer routers. Results are not
impressive.<br>
<a
href="https://www.smallnetbuilder.com/wireless/wireless-features/33223-does-ofdma-really-work-part-2"
target="_blank" moz-do-not-send="true">https://www.smallnetbuilder.com/wireless/wireless-features/33223-does-ofdma-really-work-part-2</a><br>
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<div><font size="-1" face="Times New Roman, Times, serif">===========<br>
Tim <br>
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