diff options
| -rw-r--r-- | sys/netinet/tcp_input.c | 12 | ||||
| -rw-r--r-- | sys/netinet/tcp_var.h | 2 |
2 files changed, 14 insertions, 0 deletions
diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c index 0e3308b..ba642a6 100644 --- a/sys/netinet/tcp_input.c +++ b/sys/netinet/tcp_input.c @@ -159,6 +159,14 @@ SYSCTL_VNET_INT(_net_inet_tcp, OID_AUTO, rfc3390, CTLFLAG_RW, &VNET_NAME(tcp_do_rfc3390), 0, "Enable RFC 3390 (Increasing TCP's Initial Congestion Window)"); +SYSCTL_NODE(_net_inet_tcp, OID_AUTO, experimental, CTLFLAG_RW, 0, + "Experimental TCP extensions"); + +VNET_DEFINE(int, tcp_do_initcwnd10) = 1; +SYSCTL_VNET_INT(_net_inet_tcp_experimental, OID_AUTO, initcwnd10, CTLFLAG_RW, + &VNET_NAME(tcp_do_initcwnd10), 0, + "Enable draft-ietf-tcpm-initcwnd-05 (Increasing initial CWND to 10)"); + VNET_DEFINE(int, tcp_do_rfc3465) = 1; SYSCTL_VNET_INT(_net_inet_tcp, OID_AUTO, rfc3465, CTLFLAG_RW, &VNET_NAME(tcp_do_rfc3465), 0, @@ -347,6 +355,7 @@ cc_conn_init(struct tcpcb *tp) * * RFC5681 Section 3.1 specifies the default conservative values. * RFC3390 specifies slightly more aggressive values. + * Draft-ietf-tcpm-initcwnd-05 increases it to ten segments. * * If a SYN or SYN/ACK was lost and retransmitted, we have to * reduce the initial CWND to one segment as congestion is likely @@ -354,6 +363,9 @@ cc_conn_init(struct tcpcb *tp) */ if (tp->snd_cwnd == 1) tp->snd_cwnd = tp->t_maxseg; /* SYN(-ACK) lost */ + else if (V_tcp_do_initcwnd10) + tp->snd_cwnd = min(10 * tp->t_maxseg, + max(2 * tp->t_maxseg, 14600)); else if (V_tcp_do_rfc3390) tp->snd_cwnd = min(4 * tp->t_maxseg, max(2 * tp->t_maxseg, 4380)); diff --git a/sys/netinet/tcp_var.h b/sys/netinet/tcp_var.h index 90ecca1..2e2a016 100644 --- a/sys/netinet/tcp_var.h +++ b/sys/netinet/tcp_var.h @@ -611,6 +611,7 @@ VNET_DECLARE(int, tcp_mssdflt); /* XXX */ VNET_DECLARE(int, tcp_minmss); VNET_DECLARE(int, tcp_delack_enabled); VNET_DECLARE(int, tcp_do_rfc3390); +VNET_DECLARE(int, tcp_do_initcwnd10); VNET_DECLARE(int, tcp_sendspace); VNET_DECLARE(int, tcp_recvspace); VNET_DECLARE(int, path_mtu_discovery); @@ -623,6 +624,7 @@ VNET_DECLARE(int, tcp_abc_l_var); #define V_tcp_minmss VNET(tcp_minmss) #define V_tcp_delack_enabled VNET(tcp_delack_enabled) #define V_tcp_do_rfc3390 VNET(tcp_do_rfc3390) +#define V_tcp_do_initcwnd10 VNET(tcp_do_initcwnd10) #define V_tcp_sendspace VNET(tcp_sendspace) #define V_tcp_recvspace VNET(tcp_recvspace) #define V_path_mtu_discovery VNET(path_mtu_discovery) |
