[Bloat] Re: The hell has frozen: Latency mentioned at APNIC 62, during a keynote!

[bob.mcmahon@umbernetworks.com]

Hi All,

Just a reminder that bufferbloat isn't the only source of latency or 
jitter. Here's an animation showing some of the other places delay can 
accumulate over the pipeline w/Wi-Fi as a component.

https://www.umbernetworks.com/mac_collapse_lights.php

I'm still working out a few bugs in the animations, but the ideas are 
there. It's from the view of an AP radio or a Fi-Wi radio head, and 
ramps up the traffic from 50 clients.

The animation pipeline includes:

o) Send-side buffering
o) Bytes in flight
o) The 802.11 forwarding plane
o) 802.11 arbitration
o) DMA transfers
o) Over-the-air (OTA) transmission
o) OTA acknowledgment

Bob

PS. Iperf 2 is on the play store.  https://iperf2.fi-wi.com/  Let me 
know if it helps or not.

> We came up with a more accurate, but wordy declaration:
> 
>> "The most important performance metric where
>> systems fall short today is not bandwidth, or compute. It is latency."
> 
> 
> To make a more punchy statement, s/scarce resource/bottleneck/ to 
> get...
> 
>>  "The bottleneck is not bandwidth, or compute. It is latency."
> 
> Thoughts?
> 
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