关键词: 缓存大小，TCP，队列管理，动态调节阂值

Abstract: This paper reviewed the researches of buffer sizing in routers, focused on five typical buffer sizing methods based on the model of TCP protocol. and then concluded from comparison and analysis that buffer sizing methods based on different assumptions should be adapted to different network environments. Meanwhile we studied several primary factors which influence buffer requirement, then mainly analyzed how TCP protocols and Queue Management mechanisms interact with buffer sizing methods, thus pointed out that in complicated and dynamic network environments adaptive buffer sizing method should be adopted.

Key words: Buffer sizing,TCP,Queue management,Dynamic threshold adjustment