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Index: head/sys/netinet/cc/cc_cubic.c
===================================================================
--- head/sys/netinet/cc/cc_cubic.c
+++ head/sys/netinet/cc/cc_cubic.c
@@ -132,19 +132,29 @@
/*
* Regular ACK and we're not in cong/fast recovery and we're cwnd
- * limited and we're either not doing ABC or are slow starting or are
- * doing ABC and we've sent a cwnd's worth of bytes.
+ * limited and we're either not doing ABC or are just coming out
+ * from slow-start or were application limited or are slow starting
+ * or are doing ABC and we've sent a cwnd's worth of bytes.
*/
if (type == CC_ACK && !IN_RECOVERY(CCV(ccv, t_flags)) &&
(ccv->flags & CCF_CWND_LIMITED) && (!V_tcp_do_rfc3465 ||
+ (cubic_data->flags & (CUBICFLAG_IN_SLOWSTART | CUBICFLAG_IN_APPLIMIT)) ||
CCV(ccv, snd_cwnd) <= CCV(ccv, snd_ssthresh) ||
- (V_tcp_do_rfc3465 && ccv->flags & CCF_ABC_SENTAWND))) {
+ (V_tcp_do_rfc3465 && (ccv->flags & CCF_ABC_SENTAWND)))) {
/* Use the logic in NewReno ack_received() for slow start. */
if (CCV(ccv, snd_cwnd) <= CCV(ccv, snd_ssthresh) ||
cubic_data->min_rtt_ticks == TCPTV_SRTTBASE) {
cubic_data->flags |= CUBICFLAG_IN_SLOWSTART;
newreno_cc_algo.ack_received(ccv, type);
} else {
+ if (cubic_data->flags & (CUBICFLAG_IN_SLOWSTART |
+ CUBICFLAG_IN_APPLIMIT)) {
+ cubic_data->flags &= ~(CUBICFLAG_IN_SLOWSTART |
+ CUBICFLAG_IN_APPLIMIT);
+ cubic_data->t_last_cong = ticks;
+ cubic_data->K = cubic_k(cubic_data->max_cwnd /
+ CCV(ccv, t_maxseg));
+ }
if ((ticks_since_cong =
ticks - cubic_data->t_last_cong) < 0) {
/*
@@ -152,14 +162,6 @@
*/
ticks_since_cong = INT_MAX;
cubic_data->t_last_cong = ticks - INT_MAX;
- }
-
- if (cubic_data->flags & (CUBICFLAG_IN_SLOWSTART |
- CUBICFLAG_IN_APPLIMIT)) {
- cubic_data->flags &= ~(CUBICFLAG_IN_SLOWSTART |
- CUBICFLAG_IN_APPLIMIT);
- cubic_data->t_last_cong = ticks;
- cubic_data->K = 0;
}
/*
* The mean RTT is used to best reflect the equations in

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