What is WFQ in QoS?
What is WFQ in QoS?
WFQ is a flow-based queuing algorithm used in Quality of Service (QoS) that does two things simultaneously: It schedules interactive traffic to the front of the queue to reduce response time, and it fairly shares the remaining bandwidth between high bandwidth flows. …
What is WFQ scheduling?
Weighted fair queueing (WFQ) is a network scheduling algorithm. Weighted fair queuing is also known as packet-by-packet GPS (PGPS or P-GPS) since it approximates generalized processor sharing “to within one packet transmission time, regardless of the arrival patterns.”
What is meant by weighted fair queuing WFQ )? Explain and discuss briefly?
Weighted fair queuing (WFQ) is a dynamic process that divides bandwidth among queues based on weights. The process is designed to be fair, such that WFQ ensures that all traffic is treated fairly with regard to its weight.
What is priority queue and weighted queue?
Weighted Fair queuing (WFQ) alleviates the problem of bandwidth starvation by servicing packets from each queue in a round robin manner, so that all queues are serviced fairly within a given time interval. High priority queues get more service and lower priority queues get less service.
How does WFQ implement tail dropping?
WFQ uses a slightly modified tail-drop policy for choosing when to drop packets. WFQ places an absolute limit on the number of packets enqueued among all queues; this value is called the hold-queue limit. If a new packet arrives, and the hold-queue limit has been reached, the packet is discarded.
What is an essential difference between RR and WFQ packet scheduling?
The major difference between RR and WFQ: Round Robin scheduling algorithm classifies the packets into classes and rotates the scheduler between these classes, thus avoiding starvation of packets. All packets get equal priority.
How does fair queuing work?
Fair queuing uses one queue per packet flow and services them in rotation, such that each flow can “obtain an equal fraction of the resources”. With a link data-rate of R, at any given time the N active data flows (the ones with non-empty queues) are serviced each with an average data rate of R/N.
Which algorithm is based on queuing technique?
The Stochastic Fairness Queuing (SFQ) algorithm is a simpler and less accurate implementation of the FQ algorithms and requires less calculations. SFQ ensures that each flow has the opportunity to transmit an equal amount of data and takes into account data packet sizes . Class-Based Queuing (CBQ).
What is meant by priority queue?
In computer science, a priority queue is an abstract data type similar to a regular queue or stack data structure in which each element additionally has a “priority” associated with it. In a priority queue, an element with high priority is served before an element with low priority.