Weaknesses
To obtain a normalized set of weights, required to approximate GPS, a mean packet size must be known. In IP networks with their variable packet size the mean has to be estimated which makes good GPS approximation hard to achieve in practice. Another weakness of WRR is that it cannot guarantee fair link sharing.
Deficit round robin is a variation of WRR that achieves better GPS approximation without knowing the mean packet size of each connection in advance. There are more effective scheduling disciplines which handle both of these problems mentioned above (e.g. weighted fair queuing).
Read more about this topic: Weighted Round Robin
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