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Difference: Round Robin(RR) vs Weighted Fair Queuing (WFQ)

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zulfi100

Joined Jun 7, 2012
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I am trying to understand the difference between RR and WFQ. Both of them alternate between classes of packets. But WFQ uses a differential weightage technique. This is given in the book :

WFQ differs from round robin in that each class may receive a differential amount of service in any interval of time. Specifically, each class, i, is assigned a weight, wi. Under WFQ, during any interval of time during which there are class i packets to send, class i will then be guaranteed to receive a fraction of service equal to wi/(Σwj), where the sum in the denominator is taken over all classes that also have packets queued for transmission.
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Somebody please explain the WFQ concept in a simple manner.

Zulfi.
 
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