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Merge pull request #189 from HyNetwork/wip-cc-optimizations

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CC optimizations
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Toby 2022-01-03 22:23:28 -08:00 committed by GitHub
commit 55d8ccf61e
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 46 additions and 37 deletions
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83
pkg/congestion/brutal.go
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@ -6,9 +6,9 @@ import (
)
const (
ackRateMinSampleInterval = 4 * time.Second
ackRateMaxSampleInterval = 20 * time.Second
ackRateMinACKSampleCount = 100
pktInfoSlotCount = 4
minSampleCount = 50
minAckRate = 0.75
)
type BrutalSender struct {
@ -17,10 +17,13 @@ type BrutalSender struct {
maxDatagramSize congestion.ByteCount
pacer *pacer
ackCount, lossCount uint64
ackRate float64
ackRateNextUpdateMin time.Time
ackRateNextUpdateMax time.Time
pktInfoSlots [pktInfoSlotCount]pktInfo
}
type pktInfo struct {
Timestamp int64
AckCount uint64
LossCount uint64
}
func NewBrutalSender(bps congestion.ByteCount) *BrutalSender {
@ -64,14 +67,30 @@ func (b *BrutalSender) OnPacketSent(sentTime time.Time, bytesInFlight congestion
func (b *BrutalSender) OnPacketAcked(number congestion.PacketNumber, ackedBytes congestion.ByteCount,
priorInFlight congestion.ByteCount, eventTime time.Time) {
b.ackCount += 1
b.maybeUpdateACKRate()
currentTimestamp := eventTime.Unix()
slot := currentTimestamp % pktInfoSlotCount
if b.pktInfoSlots[slot].Timestamp == currentTimestamp {
b.pktInfoSlots[slot].AckCount++
} else {
// uninitialized slot or too old, reset
b.pktInfoSlots[slot].Timestamp = currentTimestamp
b.pktInfoSlots[slot].AckCount = 1
b.pktInfoSlots[slot].LossCount = 0
}
}
func (b *BrutalSender) OnPacketLost(number congestion.PacketNumber, lostBytes congestion.ByteCount,
priorInFlight congestion.ByteCount) {
b.lossCount += 1
b.maybeUpdateACKRate()
currentTimestamp := time.Now().Unix()
slot := currentTimestamp % pktInfoSlotCount
if b.pktInfoSlots[slot].Timestamp == currentTimestamp {
b.pktInfoSlots[slot].LossCount++
} else {
// uninitialized slot or too old, reset
b.pktInfoSlots[slot].Timestamp = currentTimestamp
b.pktInfoSlots[slot].AckCount = 0
b.pktInfoSlots[slot].LossCount = 1
}
}
func (b *BrutalSender) SetMaxDatagramSize(size congestion.ByteCount) {
@ -79,36 +98,26 @@ func (b *BrutalSender) SetMaxDatagramSize(size congestion.ByteCount) {
b.pacer.SetMaxDatagramSize(size)
}
func (b *BrutalSender) maybeUpdateACKRate() {
func (b *BrutalSender) getAckRate() float64 {
now := time.Now()
if !now.After(b.ackRateNextUpdateMin) {
return
}
// Min interval reached
if b.ackCount >= ackRateMinACKSampleCount {
// And enough samples, update ackRate now
b.ackRate = float64(b.ackCount) / float64(b.ackCount+b.lossCount)
b.ackCount, b.lossCount = 0, 0
b.ackRateNextUpdateMin = now.Add(ackRateMinSampleInterval)
b.ackRateNextUpdateMax = now.Add(ackRateMaxSampleInterval)
} else {
if now.After(b.ackRateNextUpdateMax) {
// Max interval reached, still not enough samples, reset
b.ackCount, b.lossCount = 0, 0
b.ackRateNextUpdateMin = now.Add(ackRateMinSampleInterval)
b.ackRateNextUpdateMax = now.Add(ackRateMaxSampleInterval)
currentTimestamp := now.Unix()
minTimestamp := currentTimestamp - pktInfoSlotCount
var ackCount, lossCount uint64
for _, info := range b.pktInfoSlots {
if info.Timestamp < minTimestamp {
continue
}
ackCount += info.AckCount
lossCount += info.LossCount
}
}
func (b *BrutalSender) getAckRate() (rate float64) {
rate = b.ackRate
if rate <= 0 {
rate = 1
} else if rate < 0.5 {
rate = 0.5
if ackCount+lossCount < minSampleCount {
return 1
}
return
rate := float64(ackCount) / float64(ackCount+lossCount)
if rate < minAckRate {
return minAckRate
}
return rate
}
func (b *BrutalSender) InSlowStart() bool {