d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Provide a possibility to configure the inital congestion window to the

Browse Source 
value defined in RFC 4960.

MFC after: 3 months.
This commit is contained in:
tuexen 2010-12-22 19:04:14 +00:00
parent 74fe88a37c
commit 0826d29a2d
2 changed files with 13 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
sys/netinet/sctp_cc_functions.c
View File

@ -53,15 +53,19 @@ sctp_set_initial_cc_param(struct sctp_tcb *stcb, struct sctp_nets *net)
uint32_t cwnd_in_mtu;
assoc = &stcb->asoc;
/*
* We take the minimum of the burst limit and the initial congestion
* window. The initial congestion window is at least two times the
* MTU.
*/
cwnd_in_mtu = SCTP_BASE_SYSCTL(sctp_initial_cwnd);
if ((assoc->max_burst > 0) && (cwnd_in_mtu > assoc->max_burst))
cwnd_in_mtu = assoc->max_burst;
net->cwnd = (net->mtu - sizeof(struct sctphdr)) * cwnd_in_mtu;
if (cwnd_in_mtu == 0) {
/* Using 0 means that the value of RFC 4960 is used. */
net->cwnd = min((net->mtu * 4), max((2 * net->mtu), SCTP_INITIAL_CWND));
} else {
/*
* We take the minimum of the burst limit and the initial
* congestion window.
*/
if ((assoc->max_burst > 0) && (cwnd_in_mtu > assoc->max_burst))
cwnd_in_mtu = assoc->max_burst;
net->cwnd = (net->mtu - sizeof(struct sctphdr)) * cwnd_in_mtu;
}
net->ssthresh = assoc->peers_rwnd;
SDT_PROBE(sctp, cwnd, net, init,

2
sys/netinet/sctp_sysctl.h
View File

@ -500,7 +500,7 @@ struct sctp_sysctl {
/* Initial congestion window in MTU */
#define SCTPCTL_INITIAL_CWND_DESC "Initial congestion window in MTUs"
#define SCTPCTL_INITIAL_CWND_MIN 1
#define SCTPCTL_INITIAL_CWND_MIN 0
#define SCTPCTL_INITIAL_CWND_MAX 0xffffffff
#define SCTPCTL_INITIAL_CWND_DEFAULT 3