This Informational RFC describes Data Center TCP (DCTCP): a TCP
congestion control scheme for data-center traffic. DCTCP extends the
Explicit Congestion Notification (ECN) processing to estimate the
fraction of bytes that encounter congestion rather than simply
detecting that some congestion has occurred. DCTCP then scales the TCP
congestion window based on this estimate. This method achieves high-
burst tolerance, low latency, and high throughput with shallow-
buffered switches. This memo also discusses deployment issues related
to the coexistence of DCTCP and conventional TCP, discusses the lack
of a negotiating mechanism between sender and receiver, and presents
some possible mitigations. This memo documents DCTCP as currently
implemented by several major operating systems. DCTCP, as described in
this specification, is applicable to deployments in controlled
environments like data centers, but it must not be deployed over the
public Internet without additional measures.
B. Braden, David D. Clark, Jon Crowcroft, Bruce S. Davie, S. Deering, Deborah Estrin, Sally Floyd, Van Jacobson, G. Wayne Minshall, Craig Partridge, Larry Peterson, K. K. Ramakrishnan, Scott Shenker, John Wroclawski, L. Zhang
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