Show HN: BBRv3 for gVisor's netstack, visualized in the browser using WASM
ccsim.apoxy.dev
We’ve built a BBRv3 congestion control implementation for gVisor’s netstack (userspace Linux TCP/IP stack implementation in Go). As part of testing it I realized we can actually compile the whole thing into WASM and run it from the browser to get some cool visualizations from the original BBR paper: https://research.google/pubs/bbr-congestion-based-congestion...
The project is built using Fable 5 and GPT-5.6 Sol. I’ve manually reviewed actual BBRv3 implementation line-by-line, fixed bugs and made it to conform to -03 draft spec (well, mostly). The react/wasm bindings code was only lightly skimmed and obvious UI issues were chased out - there was a lot.
If you’d like learn more, there’s an accompanying (no pun intended) blog explaining CC basics and BBR insights: https://apoxy.dev/blog/netstack-bbrv3
The code: https://github.com/apoxy-dev/ccsim
If anyone has ideas what other cool things we can simulate with this stack please share!
Cheers, -Dmitry