I queried this in 2.6.18 (SUSE 10.2):
/proc/sys/net/ipv4>cat tcp_congestion_control
reno
And in the 2.6.20 till latest linus-git - it is cubic.
So searching through all the different implementation (net/ipv4/):
/hdc1/download/2.6/linux-2.6-latest/net/ipv4>grep tcp_congestion_ops *.c
tcp.c:extern struct tcp_congestion_ops tcp_reno;
tcp_bic.c:static struct tcp_congestion_ops bictcp = {
tcp_cong.c:struct tcp_congestion_ops tcp_reno = {
tcp_cubic.c:static struct tcp_congestion_ops cubictcp = {
tcp_highspeed.c:static struct tcp_congestion_ops tcp_highspeed = {
tcp_htcp.c:static struct tcp_congestion_ops htcp = {
tcp_hybla.c:static struct tcp_congestion_ops tcp_hybla = {
tcp_illinois.c:static struct tcp_congestion_ops tcp_illinois = {
tcp_input.c: const struct tcp_congestion_ops *ca_ops =
inet_csk(sk)->icsk_ca_ops;
tcp_input.c: const struct tcp_congestion_ops *ca_ops
tcp_lp.c:static struct tcp_congestion_ops tcp_lp = {
tcp_scalable.c:static struct tcp_congestion_ops tcp_scalable = {
tcp_vegas.c:static struct tcp_congestion_ops tcp_vegas = {
tcp_veno.c:static struct tcp_congestion_ops tcp_veno = {
tcp_westwood.c:static struct tcp_congestion_ops tcp_westwood = {
tcp_yeah.c:static struct tcp_congestion_ops tcp_yeah = {
and for cubic it is implemented in net/ipv4/tcp_cubic.c.
http://netsrv.csc.ncsu.edu/export/cubic-paper.pdf
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