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fix packet pair sending from SendQueue

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This commit is contained in:
Stephen Birarda 2015-07-30 10:20:09 -07:00
parent 3d523552f8
commit 57025cff74
2 changed files with 41 additions and 6 deletions
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4
libraries/networking/src/udt/Connection.cpp
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@ -228,9 +228,9 @@ SequenceNumber Connection::nextACK() const {
bool Connection::processReceivedSequenceNumber(SequenceNumber sequenceNumber) {
// check if this is a packet pair we should estimate bandwidth from, or just a regular packet
if (((uint32_t) sequenceNumber & 0xF) == 0) {
if (((uint32_t) sequenceNumber & 0xFF) == 0) {
_receiveWindow.onProbePair1Arrival();
} else if (((uint32_t) sequenceNumber & 0xF) == 1) {
} else if (((uint32_t) sequenceNumber & 0xFF) == 1) {
_receiveWindow.onProbePair2Arrival();
} else {
_receiveWindow.onPacketArrival();

43
libraries/networking/src/udt/SendQueue.cpp
View file

@ -135,13 +135,13 @@ void SendQueue::loop() {
// is greater than or equal to the gap between the last ACKed sent and the one we are about to send
if (seqlen(SequenceNumber { (uint32_t) _lastACKSequenceNumber }, _currentSequenceNumber + 1) <= _flowWindowSize) {
bool hasResend = false;
SequenceNumber seqNum;
SequenceNumber sequenceNumber;
{
// Check nak list for packet to resend
QWriteLocker locker(&_naksLock);
if (_naks.getLength() > 0) {
hasResend = true;
seqNum = _naks.popFirstSequenceNumber();
sequenceNumber = _naks.popFirstSequenceNumber();
}
}
@ -150,7 +150,7 @@ void SendQueue::loop() {
// Find packet in sent list using SequenceNumber
if (hasResend) {
QWriteLocker locker(&_sentLock);
auto it = _sentPackets.find(seqNum);
auto it = _sentPackets.find(sequenceNumber);
Q_ASSERT_X(it != _sentPackets.end(),
"SendQueue::sendNextPacket()", "Couldn't find NAKed packet to resend");
@ -167,8 +167,20 @@ void SendQueue::loop() {
_packets.pop_front();
}
bool shouldSendSecondOfPair = false;
if (!hasResend) {
// if we're not re-sending a packet then need to check if this should be a packet pair
sequenceNumber = getNextSequenceNumber();
// the first packet in the pair is every 16 (rightmost 16 bits = 0) packets
if (((uint32_t) sequenceNumber & 0xFF) == 0) {
shouldSendSecondOfPair = true;
}
}
// Write packet's sequence number and send it off
nextPacket->writeSequenceNumber(getNextSequenceNumber());
nextPacket->writeSequenceNumber(sequenceNumber);
sendPacket(*nextPacket);
// Insert the packet we have just sent in the sent list
@ -176,6 +188,29 @@ void SendQueue::loop() {
_sentPackets[nextPacket->getSequenceNumber()].swap(nextPacket);
Q_ASSERT_X(!nextPacket,
"SendQueue::sendNextPacket()", "Overriden packet in sent list");
if (shouldSendSecondOfPair) {
std::unique_ptr<Packet> pairedPacket;
// we've detected we should send the second packet in a pair, do that now before sleeping
{
QWriteLocker locker(&_packetsLock);
pairedPacket.swap(_packets.front());
_packets.pop_front();
}
if (pairedPacket) {
// write this packet's sequence number and send it off
pairedPacket->writeSequenceNumber(getNextSequenceNumber());
sendPacket(*pairedPacket);
// add the paired packet to the sent list
QWriteLocker locker(&_sentLock);
_sentPackets[pairedPacket->getSequenceNumber()].swap(pairedPacket);
Q_ASSERT_X(!pairedPacket,
"SendQueue::sendNextPacket()", "Overriden packet in sent list");
}
}
}
// since we're a while loop, give the thread a chance to process events