Why is utility cast in terms of log of rate - risk aversion - see bernouilli's argument for this from a long long time ago!
In working out the function that gives us delay cost in terms of rate allocated to a link of a given capaciity, the headroom (load / (capaciity-load) ) is the simplest function, but queuing theory may give more complex results, and multipath assignments of traffic may multiple the impact...
a useful explanation of proportional fairness
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