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move congestion controller related constants to the congestion package

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This commit is contained in:
Marten Seemann 2020-01-22 14:40:14 +07:00
parent 62d3a4166a
commit 31e4691ffd
9 changed files with 144 additions and 146 deletions
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31
internal/congestion/cubic_sender.go
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@ -8,9 +8,14 @@ import (
)
const (
maxBurstBytes = 3 * protocol.DefaultTCPMSS
renoBeta float32 = 0.7 // Reno backoff factor.
defaultMinimumCongestionWindow protocol.ByteCount = 2 * protocol.DefaultTCPMSS
// defaultTCPMSS is the default maximum packet size used in the Linux TCP implementation.
// Used in QUIC for congestion window computations in bytes.
defaultTCPMSS protocol.ByteCount = 1460
maxBurstBytes = 3 * defaultTCPMSS
renoBeta float32 = 0.7 // Reno backoff factor.
maxCongestionWindow = protocol.MaxCongestionWindowPackets * defaultTCPMSS
minCongestionWindow = 2 * defaultTCPMSS
initialCongestionWindow = 32 * defaultTCPMSS
)
type cubicSender struct {
@ -67,7 +72,11 @@ var _ SendAlgorithm = &cubicSender{}
var _ SendAlgorithmWithDebugInfos = &cubicSender{}
// NewCubicSender makes a new cubic sender
func NewCubicSender(clock Clock, rttStats *RTTStats, reno bool, initialCongestionWindow, initialMaxCongestionWindow protocol.ByteCount) *cubicSender {
func NewCubicSender(clock Clock, rttStats *RTTStats, reno bool) *cubicSender {
return newCubicSender(clock, rttStats, reno, initialCongestionWindow, maxCongestionWindow)
}
func newCubicSender(clock Clock, rttStats *RTTStats, reno bool, initialCongestionWindow, initialMaxCongestionWindow protocol.ByteCount) *cubicSender {
return &cubicSender{
rttStats: rttStats,
largestSentPacketNumber: protocol.InvalidPacketNumber,
@ -76,7 +85,7 @@ func NewCubicSender(clock Clock, rttStats *RTTStats, reno bool, initialCongestio
initialCongestionWindow: initialCongestionWindow,
initialMaxCongestionWindow: initialMaxCongestionWindow,
congestionWindow: initialCongestionWindow,
minCongestionWindow: defaultMinimumCongestionWindow,
minCongestionWindow: minCongestionWindow,
slowstartThreshold: initialMaxCongestionWindow,
maxCongestionWindow: initialMaxCongestionWindow,
numConnections: defaultNumConnections,
@ -93,7 +102,7 @@ func (c *cubicSender) TimeUntilSend(bytesInFlight protocol.ByteCount) time.Durat
return 0
}
}
return c.rttStats.SmoothedRTT() * time.Duration(protocol.DefaultTCPMSS) / time.Duration(2*c.GetCongestionWindow())
return c.rttStats.SmoothedRTT() * time.Duration(defaultTCPMSS) / time.Duration(2*c.GetCongestionWindow())
}
func (c *cubicSender) OnPacketSent(
@ -146,7 +155,7 @@ func (c *cubicSender) SlowstartThreshold() protocol.ByteCount {
}
func (c *cubicSender) MaybeExitSlowStart() {
if c.InSlowStart() && c.hybridSlowStart.ShouldExitSlowStart(c.rttStats.LatestRTT(), c.rttStats.MinRTT(), c.GetCongestionWindow()/protocol.DefaultTCPMSS) {
if c.InSlowStart() && c.hybridSlowStart.ShouldExitSlowStart(c.rttStats.LatestRTT(), c.rttStats.MinRTT(), c.GetCongestionWindow()/defaultTCPMSS) {
c.ExitSlowstart()
}
}
@ -204,7 +213,7 @@ func (c *cubicSender) OnPacketLost(
if c.congestionWindow >= 2*c.initialCongestionWindow {
c.minSlowStartExitWindow = c.congestionWindow / 2
}
c.congestionWindow -= protocol.DefaultTCPMSS
c.congestionWindow -= defaultTCPMSS
} else if c.reno {
c.congestionWindow = protocol.ByteCount(float32(c.congestionWindow) * c.RenoBeta())
} else {
@ -247,7 +256,7 @@ func (c *cubicSender) maybeIncreaseCwnd(
}
if c.InSlowStart() {
// TCP slow start, exponential growth, increase by one for each ACK.
c.congestionWindow += protocol.DefaultTCPMSS
c.congestionWindow += defaultTCPMSS
return
}
// Congestion avoidance
@ -256,8 +265,8 @@ func (c *cubicSender) maybeIncreaseCwnd(
c.numAckedPackets++
// Divide by num_connections to smoothly increase the CWND at a faster
// rate than conventional Reno.
if c.numAckedPackets*uint64(c.numConnections) >= uint64(c.congestionWindow)/uint64(protocol.DefaultTCPMSS) {
c.congestionWindow += protocol.DefaultTCPMSS
if c.numAckedPackets*uint64(c.numConnections) >= uint64(c.congestionWindow)/uint64(defaultTCPMSS) {
c.congestionWindow += defaultTCPMSS
c.numAckedPackets = 0
}
} else {