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point TCPVegasCC at correct TCPRenoCC base

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This commit is contained in:
Stephen Birarda 2016-09-26 11:29:52 -07:00
parent 8c9b46c1e0
commit 69ca0d2675
4 changed files with 10 additions and 10 deletions
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4
libraries/networking/src/udt/TCPRenoCC.cpp
View file

@ -35,7 +35,7 @@ bool TCPRenoCC::isInSlowStart() {
return _sendCongestionWindowSize < _sendSlowStartThreshold;
}
int TCPRenoCC::slowStart(int numAcked) {
int TCPRenoCC::performSlowStart(int numAcked) {
int congestionWindow = std::min(_sendCongestionWindowSize + numAcked, _sendSlowStartThreshold);
numAcked -= congestionWindow - _sendCongestionWindowSize;
_sendCongestionWindowSize = std::min(congestionWindow, _sendCongestionWindowClamp);
@ -63,7 +63,7 @@ void TCPRenoCC::performCongestionAvoidance(SequenceNumber ack, int numAcked) {
// In "safe" area, increase.
if (isInSlowStart()) {
numAcked = slowStart(numAcked);
numAcked = performSlowStart(numAcked);
if (!numAcked) {
return;
}

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

@ -25,7 +25,7 @@ protected:
virtual void setInitialSendSequenceNumber(SequenceNumber seqNum) { _lastACK = seqNum - 1; }
bool isInSlowStart();
int slowStart(int numAcked);
int performSlowStart(int numAcked);
int slowStartThreshold();
bool isCongestionWindowLimited();

10
libraries/networking/src/udt/TCPVegasCC.cpp
View file

@ -55,7 +55,7 @@ void TCPVegasCC::onACK(SequenceNumber ackNum) {
}
}
void TCPVegasCC::performCongestionAvoidance(udt::SequenceNumber ack, int numACK) {
void TCPVegasCC::performCongestionAvoidance(udt::SequenceNumber ack, int numAcked) {
static int VEGAS_MIN_RTT_FOR_CALC = 3;
static uint64_t VEGAS_ALPHA_SEGMENTS = 2;
@ -67,7 +67,7 @@ void TCPVegasCC::performCongestionAvoidance(udt::SequenceNumber ack, int numACK)
// pretty sure that at least one sample did not come from a delayed ACK.
// If that is the case, we fallback to the Reno behaviour
TCPRenoCC::performCongestionAvoidance(ack, numACK);
TCPRenoCC::performCongestionAvoidance(ack, numAcked);
} else {
// There are enough RTT samples, use the Vegas algorithm to see if we should
// increase or decrease the congestion window size, and by how much
@ -92,7 +92,7 @@ void TCPVegasCC::performCongestionAvoidance(udt::SequenceNumber ack, int numACK)
inWindowReduction = true;
} else if (isInSlowStart()) {
// slow start
performSlowStart(ack);
performSlowStart(numAcked);
} else {
// figure out where the congestion window should be
if (diff > VEGAS_BETA_SEGMENTS) {
@ -114,11 +114,11 @@ void TCPVegasCC::performCongestionAvoidance(udt::SequenceNumber ack, int numACK)
static uint64_t VEGAS_CW_MIN_PACKETS = 2;
_congestionWindowSize = std::min(_congestionWindowSize, VEGAS_CW_MIN_PACKETS);
if (!inWindowReduction && _congestionWindowSize > _slowStartThreshold) {
if (!inWindowReduction && _congestionWindowSize > _sendSlowStartThreshold) {
// if we didn't just reduce the congestion window size and the
// the congestion window is greater than the slow start threshold
// we raise the slow start threshold half the distance to the congestion window
_slowStartThreshold = (_congestionWindowSize >> 1) + (_congestionWindowSize >> 2);
_sendSlowStartThreshold = (_congestionWindowSize >> 1) + (_congestionWindowSize >> 2);
}
_lastRTTMaxSeqNum = _sendCurrSeqNum;

4
libraries/networking/src/udt/TCPVegasCC.h
View file

@ -34,10 +34,10 @@ public:
virtual void onPacketSent(int packetSize, SequenceNumber seqNum) override;
protected:
virtual void performCongestionAvoidance(SequenceNumber ack, int numACK) override;
virtual void performCongestionAvoidance(SequenceNumber ack, int numAcked) override;
private:
void adjustSlowStartThreshold()
{ _slowStartThreshold = std::min(_slowStartThreshold, (uint32_t) _congestionWindowSize - 1); }
{ _sendSlowStartThreshold = std::min(_sendSlowStartThreshold, (int) _congestionWindowSize - 1); }
using TimeSizePair = std::pair<p_high_resolution_clock::time_point, int>;
using PacketTimeList = std::map<SequenceNumber, TimeSizePair>;