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send multiple packets at once, if the pacing delay is very small

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This is an optimization to avoid waking of the run loop every couple of
microseconds.
This commit is contained in:
Marten Seemann
2018-01-08 10:03:26 +07:00
parent 5ef89733ae
commit 9ef3a47da5
9 changed files with 214 additions and 88 deletions
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13
ackhandler/interfaces.go
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@@ -14,8 +14,21 @@ type SentPacketHandler interface {
ReceivedAck(ackFrame *wire.AckFrame, withPacketNumber protocol.PacketNumber, encLevel protocol.EncryptionLevel, recvTime time.Time) error
SetHandshakeComplete()
// SendingAllowed says if a packet can be sent.
// Sending packets might not be possible because:
// * we're congestion limited
// * we're tracking the maximum number of sent packets
SendingAllowed() bool
// TimeUntilSend is the time when the next packet should be sent.
// It is used for pacing packets.
TimeUntilSend() time.Time
// ShouldSendNumPackets returns the number of packets that should be sent immediately.
// It always returns a number greater or equal than 1.
// A number greater than 1 is returned when the pacing delay is smaller than the minimum pacing delay.
// Note that the number of packets is only calculated based on the pacing algorithm.
// Before sending any packet, SendingAllowed() must be called to learn if we can actually send it.
ShouldSendNumPackets() int
GetStopWaitingFrame(force bool) *wire.StopWaitingFrame
GetLowestPacketNotConfirmedAcked() protocol.PacketNumber
ShouldSendRetransmittablePacket() bool