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Queue management is an important part to provide better service of buffer at the Internet router. Active Queue Management (AQM) technique is used to improve the network performance like link utilization, delay, fairness and packet loss rate. In this paper we explore the impact of buffer size and round trip time (RTT) on AQM router where TCP Reno is used as transport protocol in single bottleneck dumbbell topology. Among many AQM techniques, we have considered random early detection (RED), random exponential marking (REM), proportional integral (PI) and adaptive virtual queue (AVQ). Through the extensive simulation, we found that the RED and AVQ obtain better stability than REM and PI by regulating queue length around its expected value. However RED and AVQ techniques drop more packets than REM and PI.