Monday, November 17, 2025

Principles of Communications Week 7 18-20/11/2025

 This week we'll cover


  • qjump[qj] - data center networking - a big special corner case of traffic scheduling.
note qj puts the token bucket pacer in a hypversions so it is a regulator and a policer in one. it could also be offloaded to a smart NIC If you had one, or just put in the guest OS if you trust it.
  • optimisation - routes for traffic, and traffic for routes
The start of traffic engineering by steering traffic by weights - note the hill descent is a classic old school AI technique.
And the origin of why tcp does AIMD is also a type of optimisation, of joint source and network utility!

[qj] The qj paper gives lots more details of setup, for anyone interested (the figures in the paper are clickable and take you to software and switch/network configurations and data).

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