Feng Gang National Laboratory of Communication,UESTC Aug 2017 Ver 1.4 Drawbacks of FIFO with Tail-drop 。 Buffer lock out by misbehaving flows a small number of flows monopolize usage of buffer capacity ·Full-queue The buffer is always full(high queueing delay) Synchronizing effect for multiple TCP flows Performance Degradation in current TCP Congestion Control Burst or multiple consecutive packet drops Bad for TCP fast recovery Low link utilization Congestion collapse 2616009:Network Traffic Engineering 5:Buffer Management Page.112616009: Network Traffic Engineering Feng Gang National Laboratory of Communication, UESTC Aug 2017 Ver 1.4 5: Buffer Management Page.11 Drawbacks of FIFO with Tail-drop • Buffer lock out by misbehaving flows - a small number of flows monopolize usage of buffer capacity • Full-queue - The buffer is always full (high queueing delay) • Synchronizing effect for multiple TCP flows • Performance Degradation in current TCP Congestion Control - Burst or multiple consecutive packet drops . Bad for TCP fast recovery - Low link utilization - Congestion collapse