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CC_CUBIC(4) BSD Kernel Interfaces Manual CC_CUBIC(4)
NAME
cc_cubic -- CUBIC Congestion Control Algorithm
DESCRIPTION
The CUBIC congestion control algorithm was designed to provide increased throughput in fast and long-distance networks. It attempts to main-
tain fairness when competing with legacy NewReno TCP in lower speed scenarios where NewReno is able to operate adequately.
The congestion window is increased as a function of the time elapsed since the last congestion event. During regular operation, the window
increase function follows a cubic function, with the inflection point set to be the congestion window value reached at the last congestion
event. CUBIC also calculates an estimate of the congestion window that NewReno would have achieved at a given time after a congestion event.
When updating the congestion window, the algorithm will choose the larger of the calculated CUBIC and estimated NewReno windows.
CUBIC also backs off less on congestion by changing the multiplicative decrease factor from 1/2 (used by standard NewReno TCP) to 4/5.
The implementation was done in a clean-room fashion, and is based on the Internet Draft and paper referenced in the SEE ALSO section below.
MIB Variables
There are currently no tunable MIB variables.
SEE ALSO
cc_chd(4), cc_hd(4), cc_htcp(4), cc_newreno(4), cc_vegas(4), mod_cc(4), tcp(4), mod_cc(9)
Sangtae Ha, Injong Rhee, and Lisong Xu, CUBIC for Fast Long-Distance Networks, http://tools.ietf.org/id/draft-rhee-tcpm-cubic-02.txt.
Sangtae Ha, Injong Rhee, and Lisong Xu, "CUBIC: a new TCP-friendly high-speed TCP variant", SIGOPS Oper. Syst. Rev., 5, 42, 64-74, July 2008.
ACKNOWLEDGEMENTS
Development and testing of this software were made possible in part by grants from the FreeBSD Foundation and Cisco University Research Pro-
gram Fund at Community Foundation Silicon Valley.
HISTORY
The cc_cubic congestion control module first appeared in FreeBSD 9.0.
The module was first released in 2009 by Lawrence Stewart whilst studying at Swinburne University of Technology's Centre for Advanced Inter-
net Architectures, Melbourne, Australia. More details are available at:
http://caia.swin.edu.au/urp/newtcp/
AUTHORS
The cc_cubic congestion control module and this manual page were written by Lawrence Stewart <lstewart@FreeBSD.org> and David Hayes
<david.hayes@ieee.org>.
BSD
September 15, 2011 BSD
02-14-2009
