<div dir="ltr"><div dir="ltr">I think that will depend on the wifi driver (on the tx side), and whether or not it's not sending 802.11n/ac aggregate frames immediately (and how long it's waiting). Some drivers will buffer up packets for some period of time before sending them out. So on a lightly loading transmitter, in a quiet RF airspace, the driver might add more latency than is necessary.<div><br></div><div>One thing I've seen is that the wifi aggregates, because they are so large (64KB), can end up creating some odd RTT sawtooth patterns as a full aggregate will contain packets with many send times, all received at once.</div><div><br></div><div>Here's an excellent summary: <a href="https://datatracker.ietf.org/meeting/101/materials/slides-101-iccrg-an-update-on-bbr-work-at-google-00">https://datatracker.ietf.org/meeting/101/materials/slides-101-iccrg-an-update-on-bbr-work-at-google-00</a></div><div><br></div><div>-Aaron</div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Apr 1, 2020 at 10:48 AM Tim Higgins <<a href="mailto:tim@smallnetbuilder.com">tim@smallnetbuilder.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex">
<div>
<font face="Times New Roman, Times, serif">One of the things I've
been wondering about as I work on OFDMA testing is how heavily a
WiFi link needs to be loaded.<br>
As far as I can tell, all (most/many) of the flent scripts
basically have netperf TCP/IP streams running full tilt.<br>
<br>
I guess put another way, how effective are the anti-bufferbloat
methods at reducing latency on a moderately loaded link?<br>
<br>
In terms of WiFi, do I need to run a link at 90+ airtime
congestion to see OFDMA work it's magic? Or would the lack of
available airtime hinder it working?<br>
</font>
<div><br>
<div><font size="-1" face="Times New Roman, Times, serif">===========<br>
Tim <br>
</font></div>
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