BPF related blogpost on network troubleshooting at Facebook

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