Hi BPF-fans,Super awesome BPF related blogpost[0] by Jakub "Kuba" Kicinski (one of the netdev kernel maintainers).
- [0] https://developers.facebook.com/blog/post/2022/04/25/investigating-tcp-self-throttling-triggered-overload/
On how Facebook used BPF to troubleshoot a productions issue with TCP bufferbloat at high data-center rates, that caused CPUs to spin 100% in netstack NAPI processing stage.
I also loved their approach to implement CoDel in XDP for throttling the RX-queue (that were overflowing) at an earlier stage that netstack as the CPU was in a 100% overload state. They didn't share their CoDel BPF implementation, but I've added a link here[3] to my own code.
--Jesper Social media links: [1] https://twitter.com/JesperBrouer/status/1520051491733712896[2] https://www.linkedin.com/feed/update/urn:li:activity:6925818081055289344/ [3] https://github.com/xdp-project/bpf-examples/blob/master/traffic-pacing-edt/codel_impl.h
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