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Index: sys/netinet/tcp_stacks/rack.c
===================================================================
--- sys/netinet/tcp_stacks/rack.c
+++ sys/netinet/tcp_stacks/rack.c
@@ -20742,8 +20742,17 @@
* The idea behind that is instead of having to have
* the peer wait for the delayed-ack timer to run off
* we send an ack that makes the peer send us an ack.
+ *
+ * Note we do not send anything if its been less than
+ * a srtt.
*/
- rack_send_ack_challange(rack);
+ uint64_t tmark;
+
+ tmark = tcp_get_u64_usecs(&tv);
+ if ((tmark > rack->r_ctl.lt_timemark) &&
+ (((tmark - rack->r_ctl.lt_timemark) / 1000) > tp->t_srtt)) {
+ rack_send_ack_challange(rack);
+ }
}
if (tot_len_this_send > 0) {
rack->r_ctl.fsb.recwin = recwin;
@@ -21143,7 +21152,7 @@
to.to_tsecr = tp->ts_recent;
to.to_flags |= TOF_TS;
if ((len == 0) &&
- (TCPS_HAVEESTABLISHED(tp->t_state)) &&
+ (tp->t_state == TCPS_ESTABLISHED) &&
((ms_cts - rack->r_ctl.last_rcv_tstmp_for_rtt) > RCV_PATH_RTT_MS) &&
(tp->snd_una == tp->snd_max) &&
(flags & TH_ACK) &&

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