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setup default for RTT, RTT variance, _synInterval

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This commit is contained in:
Stephen Birarda 2015-07-29 15:28:20 -07:00
parent 85156b9d0f
commit 55555cf13e
4 changed files with 14 additions and 5 deletions
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2
libraries/networking/src/udt/CongestionControl.cpp
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@ -20,7 +20,7 @@ static const double USECS_PER_SECOND = 1000000.0;
void DefaultCC::init() {
_lastRCTime = high_resolution_clock::now();
_mss = udt::MAX_PACKET_SIZE;
_mss = udt::MAX_PACKET_SIZE_WITH_UDP_HEADER;
_slowStartLastAck = _sendCurrSeqNum;
_lastDecreaseMaxSeq = SequenceNumber { SequenceNumber::MAX };

8
libraries/networking/src/udt/Connection.cpp
View file

@ -30,6 +30,10 @@ Connection::Connection(Socket* parentSocket, HifiSockAddr destination, unique_pt
_destination(destination),
_congestionControl(move(congestionControl))
{
// setup default SYN, RTT and RTT Variance based on the SYN interval in CongestionControl object
_synInterval = _congestionControl->synInterval();
_rtt = _synInterval * 10;
_rttVariance = _rtt / 2;
}
Connection::~Connection() {
@ -126,7 +130,9 @@ void Connection::sendACK(bool wasCausedBySyncTimeout) {
// pack in the RTT and variance
ackPacket->writePrimitive(_rtt);
// pack the available buffer size - must be a minimum of 2
// pack the available buffer size, in packets
// in our implementation we have no hard limit on receive buffer size, send the default value
ackPacket->writePrimitive((int32_t) udt::CONNECTION_RECEIVE_BUFFER_SIZE_PACKETS);
if (wasCausedBySyncTimeout) {
// pack in the receive speed and estimatedBandwidth

5
libraries/networking/src/udt/Connection.h
View file

@ -15,6 +15,7 @@
#include <chrono>
#include <memory>
#include "Constants.h"
#include "LossList.h"
#include "PacketTimeWindow.h"
#include "SendQueue.h"
@ -61,7 +62,7 @@ private:
int estimatedTimeout() const;
int _synInterval; // Periodical Rate Control Interval, in microseconds, defaults to 10ms
int _synInterval; // Periodical Rate Control Interval, in microseconds
int _nakInterval; // NAK timeout interval, in microseconds
int _minNAKInterval { 100000 }; // NAK timeout interval lower bound, default of 100ms
@ -79,7 +80,7 @@ private:
int32_t _rtt; // RTT, in microseconds
int32_t _rttVariance; // RTT variance
int _flowWindowSize; // Flow control window size
int _flowWindowSize { udt::MAX_PACKETS_IN_FLIGHT }; // Flow control window size
int _bandwidth { 1 }; // Exponential moving average for estimated bandwidth, in packets per second
int _deliveryRate { 16 }; // Exponential moving average for receiver's receive rate, in packets per second

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

@ -15,12 +15,14 @@
#define hifi_udt_Constants_h
namespace udt {
static const int MAX_PACKET_SIZE = 1450;
static const int MAX_PACKET_SIZE_WITH_UDP_HEADER = 1500;
static const int MAX_PACKET_SIZE = MAX_PACKET_SIZE_WITH_UDP_HEADER - 28;
static const int MAX_PACKETS_IN_FLIGHT = 25600;
static const int CONNECTION_RECEIVE_BUFFER_SIZE_PACKETS = 8192;
static const int CONNECTION_SEND_BUFFER_SIZE_PACKETS = 8192;
static const int UDP_SEND_BUFFER_SIZE_BYTES = 1048576;
static const int UDP_RECEIVE_BUFFER_SIZE_BYTES = 1048576;
static const int DEFAULT_SYN_INTERVAL_USECS = 10 * 1000;
}
#endif // hifi_udt_Constants_h