diff options
Diffstat (limited to 'share/man/man4/cc_cubic.4')
-rw-r--r-- | share/man/man4/cc_cubic.4 | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/share/man/man4/cc_cubic.4 b/share/man/man4/cc_cubic.4 new file mode 100644 index 0000000..8955df3 --- /dev/null +++ b/share/man/man4/cc_cubic.4 @@ -0,0 +1,114 @@ +.\" +.\" Copyright (c) 2009 Lawrence Stewart <lstewart@FreeBSD.org> +.\" Copyright (c) 2010-2011 The FreeBSD Foundation +.\" All rights reserved. +.\" +.\" Portions of this documentation were written at the Centre for Advanced +.\" Internet Architectures, Swinburne University, Melbourne, Australia by +.\" David Hayes under sponsorship from the FreeBSD Foundation. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR +.\" ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" $FreeBSD$ +.\" +.Dd February 15, 2011 +.Dt CC_CUBIC 4 +.Os +.Sh NAME +.Nm cc_cubic +.Nd CUBIC Congestion Control Algorithm +.Sh DESCRIPTION +The CUBIC congestion control algorithm was designed to provide increased +throughput in fast and long-distance networks. +It attempts to maintain fairness when competing with legacy NewReno TCP in lower +speed scenarios where NewReno is able to operate adequately. +.Pp +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. +.Pp +CUBIC also backs off less on congestion by changing the multiplicative decrease +factor from 1/2 (used by standard NewReno TCP) to 4/5. +.Pp +The implementation was done in a clean-room fashion, and is based on the +Internet Draft and paper referenced in the +.Sx SEE ALSO +section below. +.Sh MIB Variables +There are currently no tunable MIB variables. +.Sh SEE ALSO +.Xr cc 4 , +.Xr cc_chd 4 , +.Xr cc_hd 4 , +.Xr cc_htcp 4 , +.Xr cc_newreno 4 , +.Xr cc_vegas 4 , +.Xr tcp 4 , +.Xr cc 9 +.Rs +.%A "Sangtae Ha" +.%A "Injong Rhee" +.%A "Lisong Xu" +.%T "CUBIC for Fast Long-Distance Networks" +.%U "http://tools.ietf.org/id/draft-rhee-tcpm-cubic-02.txt" +.Re +.Rs +.%A "Sangtae Ha" +.%A "Injong Rhee" +.%A "Lisong Xu" +.%T "CUBIC: a new TCP-friendly high-speed TCP variant" +.%J "SIGOPS Oper. Syst. Rev." +.%V "42" +.%N "5" +.%D "July 2008" +.%P "64-74" +.Re +.Sh ACKNOWLEDGEMENTS +Development and testing of this software were made possible in part by grants +from the FreeBSD Foundation and Cisco University Research Program Fund at +Community Foundation Silicon Valley. +.Sh HISTORY +The +.Nm +congestion control module first appeared in +.Fx 9.0 . +.Pp +The module was first released in 2009 by Lawrence Stewart whilst studying at +Swinburne University's Centre for Advanced Internet Architectures, Melbourne, +Australia. +More details are available at: +.Pp +http://caia.swin.edu.au/urp/newtcp/ +.Sh AUTHORS +.An -nosplit +The +.Nm +congestion control module and this manual page were written by +.An Lawrence Stewart Aq lstewart@FreeBSD.org +and +.An David Hayes Aq david.hayes@ieee.org . |