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Only apply more frequent cwnd updates after slow start.

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This commit is contained in:
Mike Perry 2022-01-21 23:20:52 +00:00
parent 43f6f3fd3a
commit d62f9c9d00
1 changed files with 8 additions and 2 deletions
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8
src/core/or/congestion_control_st.h
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@ -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,