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add a flag to turn off PRR

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This commit is contained in:
Marten Seemann 2019-05-21 10:57:55 +01:00
parent 8afed81c49
commit fd33eb319f
2 changed files with 24 additions and 5 deletions
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15
internal/congestion/cubic_sender.go
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@ -20,7 +20,8 @@ type cubicSender struct {
stats connectionStats
cubic *Cubic
reno bool
noPRR bool
reno bool
// Track the largest packet that has been sent.
largestSentPacketNumber protocol.PacketNumber
@ -86,7 +87,7 @@ func NewCubicSender(clock Clock, rttStats *RTTStats, reno bool, initialCongestio
// TimeUntilSend returns when the next packet should be sent.
func (c *cubicSender) TimeUntilSend(bytesInFlight protocol.ByteCount) time.Duration {
if c.InRecovery() {
if !c.noPRR && c.InRecovery() {
// PRR is used when in recovery.
if c.prr.CanSend(c.GetCongestionWindow(), bytesInFlight, c.GetSlowStartThreshold()) {
return 0
@ -114,7 +115,7 @@ func (c *cubicSender) OnPacketSent(
}
func (c *cubicSender) CanSend(bytesInFlight protocol.ByteCount) bool {
if c.InRecovery() {
if !c.noPRR && c.InRecovery() {
return c.prr.CanSend(c.GetCongestionWindow(), bytesInFlight, c.GetSlowStartThreshold())
}
return bytesInFlight < c.GetCongestionWindow()
@ -159,7 +160,9 @@ func (c *cubicSender) OnPacketAcked(
c.largestAckedPacketNumber = utils.MaxPacketNumber(ackedPacketNumber, c.largestAckedPacketNumber)
if c.InRecovery() {
// PRR is used when in recovery.
c.prr.OnPacketAcked(ackedBytes)
if !c.noPRR {
c.prr.OnPacketAcked(ackedBytes)
}
return
}
c.maybeIncreaseCwnd(ackedPacketNumber, ackedBytes, priorInFlight, eventTime)
@ -192,7 +195,9 @@ func (c *cubicSender) OnPacketLost(
c.stats.slowstartPacketsLost++
}
c.prr.OnPacketLost(priorInFlight)
if !c.noPRR {
c.prr.OnPacketLost(priorInFlight)
}
// TODO(chromium): Separate out all of slow start into a separate class.
if c.slowStartLargeReduction && c.InSlowStart() {