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use a token bucket pacing algorithm

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This commit is contained in:
Marten Seemann 2020-06-17 11:32:50 +07:00
parent 312b8d37f0
commit fe622dd780
9 changed files with 104 additions and 148 deletions
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16
internal/congestion/cubic_sender.go
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@ -23,6 +23,8 @@ type cubicSender struct {
rttStats *RTTStats
stats connectionStats
cubic *Cubic
pacer *pacer
clock Clock
reno bool
@ -75,7 +77,7 @@ func NewCubicSender(clock Clock, rttStats *RTTStats, reno bool) *cubicSender {
}
func newCubicSender(clock Clock, rttStats *RTTStats, reno bool, initialCongestionWindow, initialMaxCongestionWindow protocol.ByteCount) *cubicSender {
return &cubicSender{
c := &cubicSender{
rttStats: rttStats,
largestSentPacketNumber: protocol.InvalidPacketNumber,
largestAckedPacketNumber: protocol.InvalidPacketNumber,
@ -88,13 +90,20 @@ func newCubicSender(clock Clock, rttStats *RTTStats, reno bool, initialCongestio
maxCongestionWindow: initialMaxCongestionWindow,
numConnections: defaultNumConnections,
cubic: NewCubic(clock),
clock: clock,
reno: reno,
}
c.pacer = newPacer(c.BandwidthEstimate)
return c
}
// TimeUntilSend returns when the next packet should be sent.
func (c *cubicSender) TimeUntilSend(bytesInFlight protocol.ByteCount) time.Duration {
return c.rttStats.SmoothedRTT() * time.Duration(maxDatagramSize) / time.Duration(2*c.GetCongestionWindow())
func (c *cubicSender) TimeUntilSend(_ protocol.ByteCount) time.Time {
return c.pacer.TimeUntilSend()
}
func (c *cubicSender) HasPacingBudget() bool {
return c.pacer.Budget(c.clock.Now()) >= maxDatagramSize
}
func (c *cubicSender) OnPacketSent(
@ -104,6 +113,7 @@ func (c *cubicSender) OnPacketSent(
bytes protocol.ByteCount,
isRetransmittable bool,
) {
c.pacer.SentPacket(sentTime, bytes)
if !isRetransmittable {
return
}