<div dir="ltr">It's part of the reasons iperf 2.0.14 has so many new latency, trip-time, start-time, connect, etc related features. Peak avg throughput is no longer a valid proxy for "performance."<br><br>From a testing view, attenuation or range is no longer sufficient either. Phase shifters are needed per things like VR/AR as truly optimizing the number of spatial streams is needed too.<br><br>The loss function(s) to be optimized (minimized) is far from trivial in both the definition and in [re]-computing in "real-time"<br><br>WiFi engineers have more work to do.<br><br>Bob</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jan 30, 2020 at 2:28 PM Dave Taht <<a href="mailto:dave@taht.net">dave@taht.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Rich Brown <<a href="mailto:richb.hanover@gmail.com" target="_blank">richb.hanover@gmail.com</a>> writes:<br>
<br>
>> On Jan 24, 2020, at 9:06 AM, Rich Brown <<a href="mailto:richb.hanover@gmail.com" target="_blank">richb.hanover@gmail.com</a>> wrote:<br>
>> <br>
>> I saw this overview of the now-in-testing Wi-Fi 6 at<br>
>> <a href="https://www.howtogeek.com/368332/wi-fi-6-what%E2%80%99s-different-and-why-it-matters/" rel="noreferrer" target="_blank">https://www.howtogeek.com/368332/wi-fi-6-what%E2%80%99s-different-and-why-it-matters/</a><br>
>> <br>
>> Its multiple MIMO streams and maybe talking to multiple devices at a<br>
>> time seem as if they might be outside the assumptions we use.<br>
><br>
> It's worse than I thought. I just watched this explainer video from<br>
> ExtremeNetworks: <a href="https://www.youtube.com/watch?v=owBrkFk9afM" rel="noreferrer" target="_blank">https://www.youtube.com/watch?v=owBrkFk9afM</a><br>
><br>
> If I understand correctly, they want the AP to solve a hard<br>
> (bin-packing) problem, in real-time, with unclear rules for maximizing<br>
> client goals (should the VoIP packet go first?). And no mention of<br>
> airtime fairness or latency...<br>
><br>
> Or am I missing something? Thanks.<br>
<br>
No, they punted on these things in the design. <br>
<br>
><br>
> Rich<br>
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