Comparative Analysis of Controlled Delay (CoDel) with Deficit Round Robin (DRR) to Overcome Bufferbloat Problem in Wired Network

Abstract

Bufferbloat is a problem in a packet-switched network which can happen due to increase in buffer size usage with increase in internet traffic. This creates high latency in network which ultimately degrades network performance. The active queue management (AQM) is considered to be solution for bufferbloat problem. The usage of larger size buffer in networks increases the queuing delay. This delay becomes more severe when the buffer remains full persistently behave as bad queue. The transport layer protocol misinterprets this large delay with congestion in networks which degrade their sending rate. This research study focuses on evaluation of CoDel performance for solving bufferbloat problem in wired networks. CoDel was compared with DRR in bandwidth and maximum transmission unit (MTU) simulation scenarios using network simulator-2 (ns-2).The range of packet delay and dropped rate parameters are used to analysis the Codel in above mentioned scenarios for its strengthen and weakness. The results revealed that CoDel has efficiently overcome bufferbloat problem as compare to DRR by having less packet delay.