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On Optimal Scheduling Algorithms for Small Generalized Switches

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3 Author(s)
Tianxiong Ji ; Coordinated Science Laboratory and Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign ; Eleftheria Athanasopoulou ; R. Srikant

It has been conjectured that MWS-α scheduling policies with α going to zero are heavy-traffic optimal for scheduling in a generalized switch when the objective is to minimize the number of backlogged packets in the system. We examine this conjecture by first deriving optimal or heavy-traffic optimal policies for small switches and then comparing them to MWS- α policies by simulation. Our conclusion is that the conjecture is not true in general, i.e., there are simple topologies for which there exist policies that outperform MWS-α in heavy traffic.

Published in:

IEEE/ACM Transactions on Networking  (Volume:18 ,  Issue: 5 )