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use last adjustment time to adjust every RTT

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This commit is contained in:
Stephen Birarda 2016-09-26 15:02:27 -07:00
parent 0d2e83e0fc
commit 7cc1f3261e
2 changed files with 4 additions and 3 deletions
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5
libraries/networking/src/udt/TCPVegasCC.cpp
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@ -54,7 +54,8 @@ bool TCPVegasCC::onACK(SequenceNumber ack) {
// find the min RTT during the last RTT
_currentMinRTT = std::min(_currentMinRTT, lastRTT);
if (ack >= _lastAdjustmentNextSendAck) {
auto sinceLastAdjustment = duration_cast<microseconds>(now - _lastAdjustmentTime).count();
if (sinceLastAdjustment >= _ewmaRTT) {
performCongestionAvoidance(ack);
}
@ -152,7 +153,7 @@ void TCPVegasCC::performCongestionAvoidance(udt::SequenceNumber ack) {
_congestionWindowSize = std::min(_congestionWindowSize, VEGAS_CW_MIN_PACKETS);
// mark this as the last adjustment time
_lastAdjustmentNextSendAck = _sendCurrSeqNum;
_lastAdjustmentTime = p_high_resolution_clock::now();
// reset our state for the next RTT
_currentMinRTT = std::numeric_limits<int>::max();

2
libraries/networking/src/udt/TCPVegasCC.h
View file

@ -44,7 +44,7 @@ private:
using PacketTimeList = std::map<SequenceNumber, TimeSizePair>;
PacketTimeList _sentPacketTimes; // Map of sequence numbers to sent time
SequenceNumber _lastAdjustmentNextSendAck; // Sequence number of next packet to be sent at time of last adjustment
p_high_resolution_clock::time_point _lastAdjustmentTime; // Time of last congestion control adjustment
bool _slowStart { false }; // Marker for slow start phase