Efficiency

The ratio between the average utilised, and optimum window size is a metric that can be used to determine the influence of slow start and window limitation on a connection's average behaviour where a value of 1 indicates fair utilisation. The closer the ratio is to zero the greater the impediment TCP's congestion control is to the realisation of optimal bandwidth usage. A ratio greater than 1 shows that TCP would use more than the fair share of bandwidth for the particular congestion level and transfer size. As the ratio indicates the extent to which a TCP connection is able to utilise its fair share of network resource we refer to it as the Resource Utilisation Ratio (RUR), shown in Equation 1 below.

Resource Utilisation Ratio=Average Window Size / Minimum(Transfer Size, Average Steady State Window)

Resource utilisation ration equation


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