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Copy pathcongestion_rate_test.go
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177 lines (167 loc) · 7.36 KB
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package mipstack
import (
"testing"
"time"
)
func TestTCPDeliveryRateSampleUsesLongerPipelinePhase(t *testing.T) {
stamp := func(value time.Duration) monotonicStamp { return monotonicStamp(value) + 1 }
estimator := tcpDeliveryRateEstimator{
deliveredStamp: tcpDeliveryTimestampAt(stamp(10 * time.Millisecond)),
firstSent: tcpDeliveryTimestampAt(stamp(10 * time.Millisecond)),
}
segment := sentTCPSegment{
sequence: 1, end: 1001, state: sentTCPSegmentTransmitted,
hostQueue: packetQueueTicket{queuedAt: stamp(20 * time.Millisecond)},
delivery: tcpDeliverySnapshot{firstSent: tcpDeliveryTimestampAt(stamp(10 * time.Millisecond)), deliveredStamp: tcpDeliveryTimestampAt(stamp(10 * time.Millisecond))},
}
var sample tcpDeliveryRateSample
sample.observe(segment)
estimator.finishRateSample(&sample, 1000, 1000, 0, time.Unix(100, 0), stamp(25*time.Millisecond), time.Millisecond, time.Millisecond, time.Millisecond)
if !sample.valid || sample.interval != 15*time.Millisecond || sample.delivered != 1000 {
t.Fatalf("delivery sample = valid %t interval %v delivered %d", sample.valid, sample.interval, sample.delivered)
}
if estimator.firstSent != tcpDeliveryTimestampAt(stamp(20*time.Millisecond)) {
t.Fatalf("next send-phase boundary = %d, want %d", estimator.firstSent, tcpDeliveryTimestampAt(stamp(20*time.Millisecond)))
}
}
func TestTCPDeliveryRateSampleUsesClockTieTransmissionOrder(t *testing.T) {
stamp := monotonicStamp(time.Second) + 1
earlier := sentTCPSegment{
end: 300,
hostQueue: packetQueueTicket{queuedAt: stamp},
transmissionOrder: 1,
delivery: tcpDeliverySnapshot{firstSent: 1, deliveredStamp: 1, deliveredFlags: 100},
}
later := sentTCPSegment{
end: 200,
hostQueue: packetQueueTicket{queuedAt: stamp},
transmissionOrder: 2,
delivery: tcpDeliverySnapshot{firstSent: 2, deliveredStamp: 2, deliveredFlags: 200},
}
var sample tcpDeliveryRateSample
sample.observe(earlier)
sample.observe(later)
sample.observe(earlier)
if sample.priorDelivered != 200 || sample.lastSent != stamp || sample.lastEnd != 200 || sample.lastOrder != 2 {
t.Fatalf("clock-tied delivery selection = delivered %d sent %d end %d order %d", sample.priorDelivered, sample.lastSent, sample.lastEnd, sample.lastOrder)
}
}
func TestTCPDeliveryRateSampleSeparatesSACKProbeEligibility(t *testing.T) {
stamp := monotonicStamp(time.Second) + 1
estimator := tcpDeliveryRateEstimator{}
segment := sentTCPSegment{
sequence: 1, end: 1001,
state: sentTCPSegmentTransmitted | sentTCPSegmentSACKed,
congestionPacketState: 0x1234,
hostQueue: packetQueueTicket{queuedAt: stamp},
delivery: tcpDeliverySnapshot{firstSent: 1, deliveredStamp: 1, deliveredFlags: 100},
}
var sample tcpDeliveryRateSample
sample.observe(segment)
if sample.packetState != 0x1234 || sample.PacketLossEvidenceValid() {
t.Fatalf("SACK sample metadata = %#x/%t, want original/invalid", sample.packetState, sample.PacketLossEvidenceValid())
}
estimator.finishRateSample(&sample, 100, 100, 0, time.Unix(100, 0), stamp+monotonicStamp(time.Millisecond), 0, 0, 0)
segment.state &^= sentTCPSegmentSACKed
segment.congestionPacketState = 0x5678
sample = tcpDeliveryRateSample{}
sample.observe(segment)
if !sample.PacketLossEvidenceValid() {
t.Fatal("fresh transmission remained marked as SACK-invalid")
}
estimator.finishRateSample(&sample, 100, 100, 0, time.Unix(100, 0), stamp+monotonicStamp(2*time.Millisecond), 0, 0, 0)
if sample.packetState != 0x5678 {
t.Fatalf("fresh sample metadata = %#x, want %#x", sample.packetState, uint64(0x5678))
}
}
func TestTCPDeliveryRateSampleUsesSelectedGenerationLossEvidence(t *testing.T) {
base := sentTCPSegment{
sequence: 1, end: 1001,
hostQueue: packetQueueTicket{queuedAt: monotonicStamp(1)},
delivery: tcpDeliverySnapshot{firstSent: 1, deliveredStamp: 1},
}
for _, test := range []struct {
name string
olderSACKed bool
newerSACKed bool
wantValid bool
}{
{name: "newer ordinary generation", olderSACKed: true, wantValid: true},
{name: "newer SACK generation", newerSACKed: true, wantValid: false},
} {
t.Run(test.name, func(t *testing.T) {
older, newer := base, base
older.state = sentTCPSegmentTransmitted
older.state.set(sentTCPSegmentSACKed, test.olderSACKed)
older.congestionPacketState = 1
newer.state = sentTCPSegmentTransmitted
newer.state.set(sentTCPSegmentSACKed, test.newerSACKed)
newer.hostQueue.queuedAt = monotonicStamp(2)
newer.congestionPacketState = 2
var sample tcpDeliveryRateSample
sample.observe(older)
sample.observe(newer)
if sample.packetState != 2 || sample.PacketLossEvidenceValid() != test.wantValid {
t.Fatalf("selected generation = state %#x/%t, want packet state 2/evidence %t", sample.packetState, sample.PacketLossEvidenceValid(), test.wantValid)
}
})
}
}
func TestTCPDeliveryRateSampleRejectsSACKReneging(t *testing.T) {
controller := newTCPCongestionController(CongestionControlBBR)
sample := tcpDeliveryRateSample{
priorStamp: 1,
firstSent: 1,
lastSent: monotonicStamp(2*time.Millisecond) + 1,
}
controller.finishDeliveryRateSample(&sample, 1000, 1000, 0, time.Unix(100, 0), monotonicStamp(3*time.Millisecond)+1, 0, time.Millisecond, 0, true)
if sample.delivered != 1000 || sample.interval == 0 {
t.Fatalf("reneging sample accounting = delivered %d interval %v", sample.delivered, sample.interval)
}
if sample.valid {
t.Fatal("SACK reneging produced a valid delivery-rate sample")
}
}
func TestTCPDeliveryTimestampWrapsAcrossUint32(t *testing.T) {
earlier := tcpDeliveryTimestamp(^uint32(0) - 5)
later := tcpDeliveryTimestamp(5)
if interval := tcpDeliveryTimestampDuration(later, earlier); interval != 11*time.Microsecond {
t.Fatalf("wrapped delivery interval = %v, want 11us", interval)
}
}
func TestTCPDeliveryCounterWrapsAcross31Bits(t *testing.T) {
earlier := tcpDeliveryDeliveredMask - 5
later := uint32(5)
if !tcpDeliveryAfterEqual(later, earlier) {
t.Fatal("wrapped delivered counter was ordered before its reference")
}
if tcpDeliveryAfterEqual(earlier, later) {
t.Fatal("reverse wrapped delivered counter comparison was accepted")
}
estimator := tcpDeliveryRateEstimator{delivered: uint64(tcpDeliveryApplicationLimited) + 5}
sample := tcpDeliveryRateSample{
priorDelivered: earlier,
priorStamp: 1,
firstSent: 1,
lastSent: monotonicStamp(time.Microsecond) + 1,
}
estimator.finishRateSample(&sample, 0, 0, 0, time.Unix(100, 0), monotonicStamp(2*time.Microsecond)+1, 0, 0, 0)
if sample.delivered != 11 || !sample.valid {
t.Fatalf("wrapped delivered sample = %d, valid %t; want 11, true", sample.delivered, sample.valid)
}
if prior := sample.PriorDeliveredBytes(); prior != uint64(tcpDeliveryApplicationLimited)-6 {
t.Fatalf("public prior delivered bytes = %d, want %d", prior, uint64(tcpDeliveryApplicationLimited)-6)
}
}
func TestTCPDeliverySnapshotPacksApplicationLimit(t *testing.T) {
estimator := tcpDeliveryRateEstimator{delivered: 1234, applicationLimitedUntil: 2000}
snapshot := estimator.snapshot()
if snapshot.delivered() != 1234 || !snapshot.applicationLimited() {
t.Fatalf("packed snapshot = delivered %d limited %t", snapshot.delivered(), snapshot.applicationLimited())
}
estimator.applicationLimitedUntil = 0
snapshot = estimator.snapshot()
if snapshot.applicationLimited() {
t.Fatal("unlimited snapshot retained application-limited flag")
}
}