svcadm(8)을 검색하려면 섹션에서 8 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.
cc_newreno(4)
CC_NEWRENO(4) BSD Kernel Interfaces Manual CC_NEWRENO(4)
NAME
cc_newreno — NewReno Congestion Control Algorithm
SYNOPSIS
#include <netinet/cc/cc_newreno.h>
DESCRIPTION
The NewReno congestion control algorithm is the default for TCP. Details
about the algorithm can be found in RFC5681.
Socket Options
The cc_newreno module supports a number of socket options under TCP_CCAL‐
GOOPT (refer to tcp(4) and moc_cc(9) for details) which can be set with
setsockopt(2) and tested with getsockopt(2). The cc_newreno socket
options use this structure defined in <sys/netinet/cc/cc_newreno.h>:
struct cc_newreno_opts {
int name;
uint32_t val;
}
CC_NEWRENO_BETA Multiplicative window decrease factor, specified as
a percentage, applied to the congestion window in
response to a congestion signal per: cwnd = (cwnd *
CC_NEWRENO_BETA) / 100. Default is 50.
CC_NEWRENO_BETA_ECN Multiplicative window decrease factor, specified as
a percentage, applied to the congestion window in
response to an ECN congestion signal when
net.inet.tcp.cc.abe=1 per: cwnd = (cwnd *
CC_NEWRENO_BETA_ECN) / 100. Default is 80.
MIB Variables
The algorithm exposes these variables in the net.inet.tcp.cc.newreno
branch of the sysctl(3) MIB:
beta Multiplicative window decrease factor, specified as a percent‐
age, applied to the congestion window in response to a conges‐
tion signal per: cwnd = (cwnd * beta) / 100. Default is 50.
beta_ecn Multiplicative window decrease factor, specified as a percent‐
age, applied to the congestion window in response to an ECN
congestion signal when net.inet.tcp.cc.abe=1 per: cwnd = (cwnd
* beta_ecn) / 100. Default is 80.
SEE ALSO
cc_chd(4), cc_cubic(4), cc_hd(4), cc_htcp(4), cc_vegas(4), mod_cc(4),
tcp(4), mod_cc(9)
Mark Allman, Vern Paxson, and Ethan Blanton, TCP Congestion Control, RFC
5681.
Naeem Khademi, Michael Welzl, Grenville Armitage, and Gorry Fairhurst,
TCP Alternative Backoff with ECN (ABE), internet draft, draft-ietf-tcpm-
alternativebackoff-ecn, February 2018, work in progress.
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 cc_newreno congestion control algorithm first appeared in its modular
form in FreeBSD 9.0.
The module was first released in 2007 by James Healy and Lawrence Stewart
whilst working on the NewTCP research project at Swinburne University of
Technology's Centre for Advanced Internet Architectures, Melbourne, Aus‐
tralia, which was made possible in part by a grant from the Cisco Univer‐
sity Research Program Fund at Community Foundation Silicon Valley. More
details are available at:
http://caia.swin.edu.au/urp/newtcp/
AUTHORS
The cc_newreno congestion control module was written by James Healy
<jimmy@deefa.com>, Lawrence Stewart <lstewart@FreeBSD.org> and David
Hayes <david.hayes@ieee.org>.
Support for TCP ABE was added by Tom Jones <tj@enoti.me>.
This manual page was written by Lawrence Stewart <lstewart@FreeBSD.org>.
BSD March 19, 2018 BSD