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by exikyut 1525 days ago
Last snapshot on Oct 02 2021 before page was changed: https://web.archive.org/web/20211002154145/https://www.badmo...

The site seems to be focusing on latency/jitter issues: https://web.archive.org/web/20210506114456fw_/https://badmod...

I'm not entirely sure what to make of the information presented. The page above includes an embedded video demonstrating a difference between ICMP and TCP load-testing: https://www.youtube.com/watch?v=15cJ400yR_E

I'm not knocking that there is interesting data, I'm rather trying to consider potential confounding factors that could call the conclusions being drawn into question.

In particular, I have two questions:

- This doesn't talk about "bufferbloat" (https://en.wikipedia.org/wiki/Bufferbloat) or internal buffering happening inside the modem, only latency/jitter. I'm honestly completely naive about the relationship between the two concepts, but I thought they had reasonable overlap, and could even potentially go some way to explaining the dynamics of what's going on. Why not?

- The video seems to just be TCP- and ICMP-pinging 8.8.8.8. Surely that address is sufficiently hammered that it probably implements fairly aggressive rate control algorithms...?

1 comments

This was a pretty well known issue on the Intel Puma chips, it could happen with a small stream of packets being sent at the user, nowhere near saturating their connection.