Controlled Delay Active Queue Management
2018
The "persistently full buffer" problem has been discussed in the IETF
community since the early 80's [RFC896]. The IRTF's End-to-End
Working Group called for the deployment of active queue management
(AQM) to solve the problem in 1998 [RFC2309]. Despite the awareness,
the problem gotten worse as by Moore's Law growth in memory density
fueled an exponential increase in buffer pool size. Efforts to deploy
AQM have been frustrated by difficult configuration and negative
impact on network utilization. The full buffer problem, recently
christened "bufferbloat"[TSVBB2011, BB2011] has become increasingly
important throughout the Internet but particularly at the consumer
edge. To address bufferbloat, this document describes a general
framework for controlling excessived delay in networks called
Controlled Delay (CoDel) designed to work in modern networking
environments as a part of the solution to bufferbloat [CODEL2012].
CoDel consists of an estimator, a setpoint, and a control loop and can
be deployed in the Internet without configuration. CoDel comprises
some major technical innovations and has been made available as open
source so that the framework can be applied by the community to a
range of problems. It has been implemented in Linux (and available in
the Linux distribution) and deployed in some networks at the consumer
edge. In addition, the framework has been successfully applied in
other ways. Note: Code Components extracted from this document must
include the license as included with the code in Section 5.
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