Only apply more frequent cwnd updates after slow start. (d62f9c9d) · Commits · delroth / Tor

src/core/or/congestion_control_st.h

+8 −2

Original line number	Diff line number	Diff line
		@@ -206,7 +206,8 @@ struct congestion_control_t {
		*
		* Congestion control literature recommends only one update of cwnd per
		* cwnd worth of acks. However, we can also tune this to be more frequent
		* by increasing the 'cc_cwnd_inc_rate' consensus parameter.
		* by increasing the 'cc_cwnd_inc_rate' consensus parameter. This tuning
		* only applies after slow start.
		*
		* If this returns 0 due to high cwnd_inc_rate, the calling code will
		* update every sendme ack.
		@@ -215,9 +216,14 @@ static inline uint64_t CWND_UPDATE_RATE(const struct congestion_control_t *cc)
		{
		/* We add cwnd_inc_rate*sendme_inc/2 to round to nearest integer number
		* of acks */

		if (cc->in_slow_start) {
		return ((cc->cwnd + cc->sendme_inc/2)/cc->sendme_inc);
		} else {
		return ((cc->cwnd + cc->cwnd_inc_rate*cc->sendme_inc/2)
		/ (cc->cwnd_inc_rate*cc->sendme_inc));
		}
		}

		/**
		* Returns the amount to increment the congestion window each update,