diff -ruN a/net/ipv4/tcp_hybla.c b/net/ipv4/tcp_hybla.c
--- a/net/ipv4/tcp_hybla.c	2008-07-13 23:51:29.000000000 +0200
+++ b/net/ipv4/tcp_hybla.c	2008-10-04 16:57:54.000000000 +0200
@@ -150,7 +150,12 @@
 		ca->snd_cwnd_cents -= 128;
 		tp->snd_cwnd_cnt = 0;
 	}
-
+	/* check when cwnd has not been incremented for a while */
+	if (increment == 0 && odd == 0 && tp->snd_cwnd_cnt >= tp->snd_cwnd)
+	{
+		tp->snd_cwnd++;
+		tp->snd_cwnd_cnt = 0;
+	}
 	/* clamp down slowstart cwnd to ssthresh value. */
 	if (is_slowstart)
 		tp->snd_cwnd = min(tp->snd_cwnd, tp->snd_ssthresh);