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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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8
internal/congestion/cubic.go
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@@ -19,7 +19,7 @@ import (
// where 0.100 is 100 ms which is the scaling round trip time.
const cubeScale = 40
const cubeCongestionWindowScale = 410
const cubeFactor protocol.ByteCount = 1 << cubeScale / cubeCongestionWindowScale / protocol.DefaultTCPMSS
const cubeFactor protocol.ByteCount = 1 << cubeScale / cubeCongestionWindowScale / defaultTCPMSS
const defaultNumConnections = 1
@@ -125,7 +125,7 @@ func (c *Cubic) OnApplicationLimited() {
// a loss event. Returns the new congestion window in packets. The new
// congestion window is a multiplicative decrease of our current window.
func (c *Cubic) CongestionWindowAfterPacketLoss(currentCongestionWindow protocol.ByteCount) protocol.ByteCount {
if currentCongestionWindow+protocol.DefaultTCPMSS < c.lastMaxCongestionWindow {
if currentCongestionWindow+defaultTCPMSS < c.lastMaxCongestionWindow {
// We never reached the old max, so assume we are competing with another
// flow. Use our extra back off factor to allow the other flow to go up.
c.lastMaxCongestionWindow = protocol.ByteCount(c.betaLastMax() * float32(currentCongestionWindow))
@@ -175,7 +175,7 @@ func (c *Cubic) CongestionWindowAfterAck(
offset = -offset
}
deltaCongestionWindow := protocol.ByteCount(cubeCongestionWindowScale*offset*offset*offset) * protocol.DefaultTCPMSS >> cubeScale
deltaCongestionWindow := protocol.ByteCount(cubeCongestionWindowScale*offset*offset*offset) * defaultTCPMSS >> cubeScale
var targetCongestionWindow protocol.ByteCount
if elapsedTime > int64(c.timeToOriginPoint) {
targetCongestionWindow = c.originPointCongestionWindow + deltaCongestionWindow
@@ -190,7 +190,7 @@ func (c *Cubic) CongestionWindowAfterAck(
// congestion windows (less than 25), the formula below will
// increase slightly slower than linearly per estimated tcp window
// of bytes.
c.estimatedTCPcongestionWindow += protocol.ByteCount(float32(c.ackedBytesCount) * c.alpha() * float32(protocol.DefaultTCPMSS) / float32(c.estimatedTCPcongestionWindow))
c.estimatedTCPcongestionWindow += protocol.ByteCount(float32(c.ackedBytesCount) * c.alpha() * float32(defaultTCPMSS) / float32(c.estimatedTCPcongestionWindow))
c.ackedBytesCount = 0
// We have a new cubic congestion window.