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MOD_CC(4) BSD Kernel Interfaces Manual MOD_CC(4)
NAME
mod_cc -- Modular congestion control
DESCRIPTION
The modular congestion control framework allows the TCP implementation to dynamically change the congestion control algorithm used by new and
existing connections. Algorithms are identified by a unique ascii(7) name. Algorithm modules can be compiled into the kernel or loaded as
kernel modules using the kld(4) facility.
The default algorithm is NewReno, and all connections use the default unless explicitly overridden using the TCP_CONGESTION socket option
(see tcp(4) for details). The default can be changed using a sysctl(3) MIB variable detailed in the MIB Variables section below.
MIB Variables
The framework exposes the following variables in the net.inet.tcp.cc branch of the sysctl(3) MIB:
available Read-only list of currently available congestion control algorithms by name.
algorithm Returns the current default congestion control algorithm when read, and changes the default when set. When attempting to change
the default algorithm, this variable should be set to one of the names listed by the net.inet.tcp.cc.available MIB variable.
SEE ALSO
cc_cdg(4), cc_chd(4), cc_cubic(4), cc_dctcp(4), cc_hd(4), cc_htcp(4), cc_newreno(4), cc_vegas(4), tcp(4), mod_cc(9)
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 mod_cc modular congestion control framework first appeared in FreeBSD 9.0.
The framework was first released in 2007 by James Healy and Lawrence Stewart whilst working on the NewTCP research project at Swinburne Uni-
versity of Technology's Centre for Advanced Internet Architectures, Melbourne, Australia, which was made possible in part by a grant from the
Cisco University Research Program Fund at Community Foundation Silicon Valley. More details are available at:
http://caia.swin.edu.au/urp/newtcp/
AUTHORS
The mod_cc facility was written by Lawrence Stewart <lstewart@FreeBSD.org>, James Healy <jimmy@deefa.com> and David Hayes
<david.hayes@ieee.org>.
This manual page was written by David Hayes <david.hayes@ieee.org> and Lawrence Stewart <lstewart@FreeBSD.org>.
BSD
January 12, 2015 BSD
02-14-2009
