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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
@@ -324,7 +324,12 @@
pipe = CCV(ccv, snd_max) - ccv->curack;
if (pipe < CCV(ccv, snd_ssthresh))
- CCV(ccv, snd_cwnd) = pipe + CCV(ccv, t_maxseg);
+ /*
+ * Ensure that cwnd does not collapse to 1 MSS under
+ * adverse conditions. Implements RFC6582
+ */
+ CCV(ccv, snd_cwnd) = max(pipe, CCV(ccv, t_maxseg)) +
+ CCV(ccv, t_maxseg);
else
/* Update cwnd based on beta and adjusted max_cwnd. */
CCV(ccv, snd_cwnd) = max(1, ((CUBIC_BETA *
Index: head/sys/netinet/cc/cc_htcp.c
===================================================================
--- head/sys/netinet/cc/cc_htcp.c
+++ head/sys/netinet/cc/cc_htcp.c
@@ -366,7 +366,12 @@
pipe = CCV(ccv, snd_max) - ccv->curack;
if (pipe < CCV(ccv, snd_ssthresh))
- CCV(ccv, snd_cwnd) = pipe + CCV(ccv, t_maxseg);
+ /*
+ * Ensure that cwnd down not collape to 1 MSS under
+ * adverse conditions. Implements RFC6582
+ */
+ CCV(ccv, snd_cwnd) = max(pipe, CCV(ccv, t_maxseg)) +
+ CCV(ccv, t_maxseg);
else
CCV(ccv, snd_cwnd) = max(1, ((htcp_data->beta *
htcp_data->prev_cwnd / CCV(ccv, t_maxseg))
Index: head/sys/netinet/cc/cc_newreno.c
===================================================================
--- head/sys/netinet/cc/cc_newreno.c
+++ head/sys/netinet/cc/cc_newreno.c
@@ -295,7 +295,12 @@
pipe = CCV(ccv, snd_max) - ccv->curack;
if (pipe < CCV(ccv, snd_ssthresh))
- CCV(ccv, snd_cwnd) = pipe + CCV(ccv, t_maxseg);
+ /*
+ * Ensure that cwnd does not collapse to 1 MSS under
+ * adverse conditons. Implements RFC6582
+ */
+ CCV(ccv, snd_cwnd) = max(pipe, CCV(ccv, t_maxseg)) +
+ CCV(ccv, t_maxseg);
else
CCV(ccv, snd_cwnd) = CCV(ccv, snd_ssthresh);
}

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