Today, we're looking at Planes, Trains and Automobiles. Or Open Loop (pre-requested) versus Closed Loop (Dynamic, Adaptive) flow and congestion control.
For some elegant underlying maths, see the section in the Computer Systems Modelling course on Control Theory here CSM, which underpins many systems today (ABS in cars, thermostats in buildings, auto-pilots in planes, and TCP and related transport protocols in the Internet).
Next week, we'll also take a look at schedulers in routers, and see how their design depends on whether the goal is to support open loop flows, or give adequate feedback to closed loop systems, and what the performance criteria should be to compare different schedulers in terms of stability, efficiency and fairness (the latter term being surprisingly complex).
n.b. forgot to resume record, so the video is from pre-recorded version rather than today's live lecture- apologies:-(
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