Interesting blog post on the latency part at
https://broadbandbreakfast.com/untitled-12/.
Looking at the FCC draft report, page 73, Figure 24 – I find it sort
of ridiculous that the table describes things as “Low Latency
Service” available or not. That is because they seem to really
misunderstand the notion of working latency. The table instead seems
to classify any network with idle latency <100 ms to be low latency
– which as Dave and others close to bufferbloat know is silly. Lots
of these networks that are in this report classified as low latency
would in fact have working latencies of 100s to 1,000s of milliseconds
– far from low latency.
I looked at FCC MBA platform data from the last 6 months and here are
the latency under load stats, 99th percentile for a selection of ten
ISPs:
ISP A 2470 ms
ISP B 2296 ms
ISP C 2281 ms
ISP D 2203 ms
ISP E 2070 ms
ISP F 1716 ms
ISP G 1468 ms
ISP H 965 ms
ISP I 909 ms
ISP J 896 ms
Jason
It does seem like there is a lot of confusion around idle latency vs
working latency. Another common error is to conflate round trip time as
two "one way delays." OWD & RTT are different metrics and both have
utility. (all of this, including working-loads, is supported in iperf 2
- https://iperf2.sourceforge.io/iperf-manpage.html - so there is free
tooling out there that can help.)
Bob
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