TAILIEUCHUNG - Promoting the Use of End-to-End Congestion Control in the Internet

This paper considers the potentially negative impacts of an increasing deployment of non-congestion-controlled best-effort traffic on the These negative impacts range from extreme unfairness against competing TCP traffic to the potential for congestion collapse. To promote the inclusion of end-to-end congestion control in the design of future protocols using best-effort traffic, we argue that router mechanisms are needed to identify and restrict the bandwidth of selected highbandwidth best-effort flows in times of congestion. The paper discusses several general approaches for identifying those flows suitable for bandwidth regulation. These approaches are to identify a high-bandwidth flow in times of congestion as unresponsive, “not TCP-friendly”, or simply using disproportionate bandwidth. A flow that is. | Promoting the Use of End-to-End Congestion Control in the Internet Sally Floyd and Kevin Fall To appear in IEEE ACM Transactions on Networking May 3 1999 Abstract This paper considers the potentially negative impacts of an increasing deployment of non-congestion-controlled best-effort traffic on the Internet. 1 These negative impacts range from extreme unfairness against competing TCP traffic to the potential for congestion collapse. To promote the inclusion of end-to-end congestion control in the design of future protocols using best-effort traffic we argue that router mechanisms are needed to identify and restrict the bandwidth of selected high-bandwidth best-effort flows in times of congestion. The paper discusses several general approaches for identifying those flows suitable for bandwidth regulation. These approaches are to identify a high-bandwidth flow in times of congestion as unresponsive not TCP-friendly or simply using disproportionate bandwidth. A flow that is not TCP-friendly is one whose long-term arrival rate exceeds that of any conformant TCP in the same circumstances. An unresponsive flow is one failing to reduce its offered load at a router in response to an increased packet drop rate and a disproportionate-bandwidth flow is one that uses considerably more bandwidth than other flows in a time of congestion. 1 Introduction The end-to-end congestion control mechanisms of TCP have been a critical factor in the robustness of the Internet. However the Internet is no longer a small closely knit user community and it is no longer practical to rely on all end-nodes to use end-to-end congestion control for best-effort traffic. Similarly it is no longer possible to rely on all developers to incorporate end-to-end congestion control in their Internet applications. The network itself must now participate in controlling its own resource utilization. This work was supported by the Director Office of Energy Research Scientific Computing Staff of the . .

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