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ackhandler: fix qlogging of RTT values (#5418)

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This commit is contained in:
Marten Seemann
2025-11-02 12:53:30 -05:00
committed by GitHub
parent a882b9a003
commit a6de3e42b3
3 changed files with 32 additions and 0 deletions
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22
internal/ackhandler/sent_packet_handler.go
View File

@@ -333,6 +333,28 @@ func (h *sentPacketHandler) SentPacket(
func (h *sentPacketHandler) qlogMetricsUpdated() {
var metricsUpdatedEvent qlog.MetricsUpdated
var updated bool
if h.rttStats.HasMeasurement() {
if h.lastMetrics.MinRTT == nil || *h.lastMetrics.MinRTT != h.rttStats.MinRTT() {
metricsUpdatedEvent.MinRTT = pointer(h.rttStats.MinRTT())
h.lastMetrics.MinRTT = pointer(h.rttStats.MinRTT())
updated = true
}
if h.lastMetrics.SmoothedRTT == nil || *h.lastMetrics.SmoothedRTT != h.rttStats.SmoothedRTT() {
metricsUpdatedEvent.SmoothedRTT = pointer(h.rttStats.SmoothedRTT())
h.lastMetrics.SmoothedRTT = pointer(h.rttStats.SmoothedRTT())
updated = true
}
if h.lastMetrics.LatestRTT == nil || *h.lastMetrics.LatestRTT != h.rttStats.LatestRTT() {
metricsUpdatedEvent.LatestRTT = pointer(h.rttStats.LatestRTT())
h.lastMetrics.LatestRTT = pointer(h.rttStats.LatestRTT())
updated = true
}
if h.lastMetrics.RTTVariance == nil || *h.lastMetrics.RTTVariance != h.rttStats.MeanDeviation() {
metricsUpdatedEvent.RTTVariance = pointer(h.rttStats.MeanDeviation())
h.lastMetrics.RTTVariance = pointer(h.rttStats.MeanDeviation())
updated = true
}
}
if h.lastMetrics.CongestionWindow == nil || *h.lastMetrics.CongestionWindow != int(h.congestion.GetCongestionWindow()) {
metricsUpdatedEvent.CongestionWindow = pointer(int(h.congestion.GetCongestionWindow()))
h.lastMetrics.CongestionWindow = pointer(int(h.congestion.GetCongestionWindow()))

4
internal/utils/rtt_stats.go
View File

@@ -115,6 +115,10 @@ func (r *RTTStats) UpdateRTT(sendDelta, ackDelay time.Duration) {
}
}
func (r *RTTStats) HasMeasurement() bool {
return r.hasMeasurement
}
// SetMaxAckDelay sets the max_ack_delay
func (r *RTTStats) SetMaxAckDelay(mad time.Duration) {
r.maxAckDelay.Store(int64(mad))

6
internal/utils/rtt_stats_test.go
View File

@@ -10,14 +10,17 @@ import (
func TestRTTStatsDefaults(t *testing.T) {
rttStats := NewRTTStats()
require.False(t, rttStats.HasMeasurement())
require.Equal(t, DefaultInitialRTT, rttStats.MinRTT())
require.Equal(t, DefaultInitialRTT, rttStats.SmoothedRTT())
}
func TestRTTStatsSmoothedRTT(t *testing.T) {
rttStats := NewRTTStats()
require.False(t, rttStats.HasMeasurement())
// verify that ack_delay is ignored in the first measurement
rttStats.UpdateRTT(300*time.Millisecond, 100*time.Millisecond)
require.True(t, rttStats.HasMeasurement())
require.Equal(t, 300*time.Millisecond, rttStats.LatestRTT())
require.Equal(t, 300*time.Millisecond, rttStats.SmoothedRTT())
// verify that smoothed RTT includes max ack delay if it's reasonable
@@ -122,11 +125,13 @@ func TestRTTStatsResetForPathMigration(t *testing.T) {
rttStats.SetMaxAckDelay(42 * time.Millisecond)
rttStats.UpdateRTT(time.Second, 0)
rttStats.UpdateRTT(10*time.Second, 0)
require.True(t, rttStats.HasMeasurement())
require.Equal(t, time.Second, rttStats.MinRTT())
require.Equal(t, 10*time.Second, rttStats.LatestRTT())
require.NotZero(t, rttStats.SmoothedRTT())
rttStats.ResetForPathMigration()
require.False(t, rttStats.HasMeasurement())
require.Equal(t, DefaultInitialRTT, rttStats.MinRTT())
require.Equal(t, DefaultInitialRTT, rttStats.LatestRTT())
require.Equal(t, DefaultInitialRTT, rttStats.SmoothedRTT())
@@ -135,6 +140,7 @@ func TestRTTStatsResetForPathMigration(t *testing.T) {
require.Equal(t, 42*time.Millisecond, rttStats.MaxAckDelay())
rttStats.UpdateRTT(10*time.Millisecond, 0)
require.True(t, rttStats.HasMeasurement())
require.Equal(t, 10*time.Millisecond, rttStats.SmoothedRTT())
require.Equal(t, 10*time.Millisecond, rttStats.LatestRTT())
}