tcp: Fix tcp_hybla zero congestion window growth with small rho and large cwnd.
Because of rounding, in certain conditions, i.e. when in congestion avoidance state rho is smaller than 1/128 of the current cwnd, TCP Hybla congestion control starves and the cwnd is kept constant forever. This patch forces an increment by one segment after #send_cwnd calls without increments(newreno behavior). Signed-off-by: Daniele Lacamera <root@danielinux.net> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -150,7 +150,11 @@ static void hybla_cong_avoid(struct sock *sk, u32 ack, u32 in_flight)
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ca->snd_cwnd_cents -= 128;
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tp->snd_cwnd_cnt = 0;
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}
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/* check when cwnd has not been incremented for a while */
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if (increment == 0 && odd == 0 && tp->snd_cwnd_cnt >= tp->snd_cwnd) {
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tp->snd_cwnd++;
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tp->snd_cwnd_cnt = 0;
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}
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/* clamp down slowstart cwnd to ssthresh value. */
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if (is_slowstart)
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tp->snd_cwnd = min(tp->snd_cwnd, tp->snd_ssthresh);
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