TCP pacing promises to reduce burstiness of TCP traffic and alleviate the impact of under-buffered routers and switches on flow throughput. However, current research literatures have not always agreed on the overall benefits of pacing. This paper re-examines the benefits and drawbacks of TCP pacing in light of new TCP variants, new application requirements, and trends in router technologies. It was found that pacing primarily has three effects: reduced burstiness of traffic, increased synchronization among the rows and fragmented SACK blocks in a flow. The paper analysis how these factors play out for different TCP implementations (Reno, NewReno, SACK, FACK) and new high-speed TCP protocols (BIC-TCP and FAST).
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