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implement packet send modes to determine what kind of packets are sent

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This commit is contained in:
Marten Seemann
2018-03-09 17:20:02 +07:00
parent 6a2c4548f7
commit b5977236ff
9 changed files with 205 additions and 92 deletions
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35
internal/ackhandler/sent_packet_handler.go
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@@ -357,18 +357,31 @@ func (h *sentPacketHandler) GetStopWaitingFrame(force bool) *wire.StopWaitingFra
return h.stopWaitingManager.GetStopWaitingFrame(force)
}
func (h *sentPacketHandler) SendingAllowed() bool {
cwnd := h.congestion.GetCongestionWindow()
congestionLimited := h.bytesInFlight > cwnd
maxTrackedLimited := protocol.PacketNumber(len(h.retransmissionQueue)+h.packetHistory.Len()) >= protocol.MaxTrackedSentPackets
if congestionLimited {
utils.Debugf("Congestion limited: bytes in flight %d, window %d", h.bytesInFlight, cwnd)
func (h *sentPacketHandler) SendMode() SendMode {
numTrackedPackets := len(h.retransmissionQueue) + h.packetHistory.Len()
// Don't send any packets if we're keeping track of the maximum number of packets.
// Note that since MaxOutstandingSentPackets is smaller than MaxTrackedSentPackets,
// we will stop sending out new data when reaching MaxOutstandingSentPackets,
// but still allow sending of retransmissions and ACKs.
if numTrackedPackets >= protocol.MaxTrackedSentPackets {
utils.Debugf("Limited by the number of tracked packets: tracking %d packets, maximum %d", numTrackedPackets, protocol.MaxTrackedSentPackets)
return SendNone
}
// Workaround for #555:
// Always allow sending of retransmissions. This should probably be limited
// to RTOs, but we currently don't have a nice way of distinguishing them.
haveRetransmissions := len(h.retransmissionQueue) > 0
return !maxTrackedLimited && (!congestionLimited || haveRetransmissions)
// Send retransmissions first, if there are any.
if len(h.retransmissionQueue) > 0 {
return SendRetransmission
}
// Only send ACKs if we're congestion limited.
if cwnd := h.congestion.GetCongestionWindow(); h.bytesInFlight > cwnd {
utils.Debugf("Congestion limited: bytes in flight %d, window %d", h.bytesInFlight, cwnd)
return SendAck
}
if numTrackedPackets >= protocol.MaxOutstandingSentPackets {
utils.Debugf("Max outstanding limited: tracking %d packets, maximum: %d", numTrackedPackets, protocol.MaxOutstandingSentPackets)
return SendAck
}
return SendAny
}
func (h *sentPacketHandler) TimeUntilSend() time.Time {