CS640: Introduction to Computer Networks. Aditya Akella Lecture 20 - Queuing and Basics of QoS. Queuing Disciplines. Each router must implement some queuing discipline Scheduling discipline Drop policy Queuing allocates both bandwidth and buffer space:
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Lecture 20 -
Queuing and Basics of QoS
Average Queue Length
Avg queue length
Variation: Weighted Fair Queuing (WFQ) Flows can have weightKey to QoS, as we will see in next class.
Cannot preempt packet
currently being transmitted
Tokens enter bucket at rate r
Bucket depth b: capacity of bucket
packet goes through,
Not enough tokens wait for tokens to accumulate