In the session today we covered Madhavapeddi Shreedhar and George Varghese paper “Efficient fair queuing using deficit round-robin” . While the session was not so much about the relatively simple algorithmic details of deficit-round-robin (still worth checking out) we talked about:
Its benefits over basic FIFO queuing and thus its impact for congestion controlled traffic (tcp) compared to not congestion controlled traffic (udp).
Its wide deployment still seen today.
Its derivatives DRR+ and DRR++ being able to handle both best-effort as well as latency critical flows.
For those interested here are sources mentioned during the session:
The insane amount of different queuing disciplines a modern Linux kernel supports.
The random early detection (RED) queuing discipline for routers (not keeping state per flow but) dropping packets before the buffer limit is reached in order to signal congestion to loss-based congestion control algorithms.
Next up we will talk about cache coherence protocols.
 Shreedhar, Madhavapeddi, and George Varghese. “Efficient fair queuing using deficit round-robin.” IEEE/ACM Transactions on networking 4.3 (1996): 375-385.