DRR

deficit round robin

A DRR scheduler is designed to address the limitations of WRR scheduling by implementing a scheduling algorithm that is based on the bytes sent on an egress link. The DRR scheduling algorithm maintains a quantum value that defines the total number of credits for each CoS queue and a credit counter that is decremented each time a byte is taken from the queue for transmission. The purpose of the credit counter is to track the use of bandwidth by a CoS queue relative to the amount of bandwidth that has been allocated to the queue.