svcadm(8)을 검색하려면 섹션에서 8 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.
mod_cc(4)
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.
Algorithm specific parameters can be set or queried using the
TCP_CCALGOOPT socket option (see tcp(4) for details). Callers must pass
a pointer to an algorithm specific data, and specify its size.
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 con‐
trol algorithms by name.
algorithm Returns the current default congestion control algo‐
rithm 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.
abe Enable support for draft-ietf-tcpm-alternativebackoff-
ecn, which alters the window decrease factor applied to
the congestion window in response to an ECN congestion
signal. Refer to individual congestion control man
pages to determine if they implement support for ABE
and for configuration details.
abe_frlossreduce If non-zero, apply standard beta instead of ABE-beta
during ECN-signalled congestion recovery episodes if
loss also needs to be repaired.
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 Program
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, Mel‐
bourne, 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 March 19, 2018 BSD