215 lines
8.9 KiB
Go
215 lines
8.9 KiB
Go
package congestion
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import (
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"time"
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"github.com/lucas-clemente/quic-go/internal/utils"
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. "github.com/onsi/ginkgo"
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. "github.com/onsi/gomega"
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)
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var _ = Describe("RTT stats", func() {
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var (
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rttStats *RTTStats
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)
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BeforeEach(func() {
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rttStats = NewRTTStats()
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})
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It("DefaultsBeforeUpdate", func() {
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Expect(rttStats.InitialRTTus()).To(BeNumerically(">", 0))
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Expect(rttStats.MinRTT()).To(Equal(time.Duration(0)))
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Expect(rttStats.SmoothedRTT()).To(Equal(time.Duration(0)))
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})
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It("SmoothedRTT", func() {
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// Verify that ack_delay is corrected for in Smoothed RTT.
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rttStats.UpdateRTT((300 * time.Millisecond), (100 * time.Millisecond), time.Time{})
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Expect(rttStats.LatestRTT()).To(Equal((200 * time.Millisecond)))
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Expect(rttStats.SmoothedRTT()).To(Equal((200 * time.Millisecond)))
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// Verify that effective RTT of zero does not change Smoothed RTT.
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rttStats.UpdateRTT((200 * time.Millisecond), (200 * time.Millisecond), time.Time{})
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Expect(rttStats.LatestRTT()).To(Equal((200 * time.Millisecond)))
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Expect(rttStats.SmoothedRTT()).To(Equal((200 * time.Millisecond)))
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// Verify that large erroneous ack_delay does not change Smoothed RTT.
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rttStats.UpdateRTT((200 * time.Millisecond), (300 * time.Millisecond), time.Time{})
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Expect(rttStats.LatestRTT()).To(Equal((200 * time.Millisecond)))
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Expect(rttStats.SmoothedRTT()).To(Equal((200 * time.Millisecond)))
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})
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It("MinRTT", func() {
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rttStats.UpdateRTT((200 * time.Millisecond), 0, time.Time{})
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Expect(rttStats.MinRTT()).To(Equal((200 * time.Millisecond)))
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Expect(rttStats.RecentMinRTT()).To(Equal((200 * time.Millisecond)))
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rttStats.UpdateRTT((10 * time.Millisecond), 0, time.Time{}.Add((10 * time.Millisecond)))
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Expect(rttStats.MinRTT()).To(Equal((10 * time.Millisecond)))
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Expect(rttStats.RecentMinRTT()).To(Equal((10 * time.Millisecond)))
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rttStats.UpdateRTT((50 * time.Millisecond), 0, time.Time{}.Add((20 * time.Millisecond)))
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Expect(rttStats.MinRTT()).To(Equal((10 * time.Millisecond)))
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Expect(rttStats.RecentMinRTT()).To(Equal((10 * time.Millisecond)))
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rttStats.UpdateRTT((50 * time.Millisecond), 0, time.Time{}.Add((30 * time.Millisecond)))
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Expect(rttStats.MinRTT()).To(Equal((10 * time.Millisecond)))
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Expect(rttStats.RecentMinRTT()).To(Equal((10 * time.Millisecond)))
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rttStats.UpdateRTT((50 * time.Millisecond), 0, time.Time{}.Add((40 * time.Millisecond)))
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Expect(rttStats.MinRTT()).To(Equal((10 * time.Millisecond)))
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Expect(rttStats.RecentMinRTT()).To(Equal((10 * time.Millisecond)))
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// Verify that ack_delay does not go into recording of MinRTT_.
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rttStats.UpdateRTT((7 * time.Millisecond), (2 * time.Millisecond), time.Time{}.Add((50 * time.Millisecond)))
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Expect(rttStats.MinRTT()).To(Equal((7 * time.Millisecond)))
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Expect(rttStats.RecentMinRTT()).To(Equal((7 * time.Millisecond)))
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})
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It("RecentMinRTT", func() {
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rttStats.UpdateRTT((10 * time.Millisecond), 0, time.Time{})
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Expect(rttStats.MinRTT()).To(Equal((10 * time.Millisecond)))
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Expect(rttStats.RecentMinRTT()).To(Equal((10 * time.Millisecond)))
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rttStats.SampleNewRecentMinRTT(4)
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for i := 0; i < 3; i++ {
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rttStats.UpdateRTT((50 * time.Millisecond), 0, time.Time{})
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Expect(rttStats.MinRTT()).To(Equal((10 * time.Millisecond)))
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Expect(rttStats.RecentMinRTT()).To(Equal((10 * time.Millisecond)))
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}
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rttStats.UpdateRTT((50 * time.Millisecond),
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0, time.Time{})
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Expect(rttStats.MinRTT()).To(Equal((10 * time.Millisecond)))
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Expect(rttStats.RecentMinRTT()).To(Equal((50 * time.Millisecond)))
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})
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It("WindowedRecentMinRTT", func() {
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// Set the window to 99ms, so 25ms is more than a quarter rtt.
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rttStats.SetRecentMinRTTwindow((99 * time.Millisecond))
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now := time.Time{}
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rtt_sample := (10 * time.Millisecond)
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rttStats.UpdateRTT(rtt_sample, 0, now)
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Expect(rttStats.MinRTT()).To(Equal((10 * time.Millisecond)))
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Expect(rttStats.RecentMinRTT()).To(Equal((10 * time.Millisecond)))
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// Gradually increase the rtt samples and ensure the RecentMinRTT starts
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// rising.
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for i := 0; i < 8; i++ {
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now = now.Add((25 * time.Millisecond))
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rtt_sample += (10 * time.Millisecond)
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rttStats.UpdateRTT(rtt_sample, 0, now)
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Expect(rttStats.MinRTT()).To(Equal((10 * time.Millisecond)))
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Expect(rttStats.GetQuarterWindowRTT()).To(Equal(rtt_sample))
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Expect(rttStats.GetHalfWindowRTT()).To(Equal(rtt_sample - (10 * time.Millisecond)))
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if i < 3 {
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Expect(rttStats.RecentMinRTT()).To(Equal(10 * time.Millisecond))
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} else if i < 5 {
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Expect(rttStats.RecentMinRTT()).To(Equal(30 * time.Millisecond))
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} else if i < 7 {
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Expect(rttStats.RecentMinRTT()).To(Equal(50 * time.Millisecond))
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} else {
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Expect(rttStats.RecentMinRTT()).To(Equal(70 * time.Millisecond))
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}
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}
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// A new quarter rtt low sets that, but nothing else.
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rtt_sample -= (5 * time.Millisecond)
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rttStats.UpdateRTT(rtt_sample, 0, now)
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Expect(rttStats.MinRTT()).To(Equal((10 * time.Millisecond)))
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Expect(rttStats.GetQuarterWindowRTT()).To(Equal(rtt_sample))
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Expect(rttStats.GetHalfWindowRTT()).To(Equal(rtt_sample - (5 * time.Millisecond)))
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Expect(rttStats.RecentMinRTT()).To(Equal((70 * time.Millisecond)))
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// A new half rtt low sets that and the quarter rtt low.
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rtt_sample -= (15 * time.Millisecond)
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rttStats.UpdateRTT(rtt_sample, 0, now)
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Expect(rttStats.MinRTT()).To(Equal((10 * time.Millisecond)))
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Expect(rttStats.GetQuarterWindowRTT()).To(Equal(rtt_sample))
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Expect(rttStats.GetHalfWindowRTT()).To(Equal(rtt_sample))
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Expect(rttStats.RecentMinRTT()).To(Equal((70 * time.Millisecond)))
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// A new full window loss sets the RecentMinRTT, but not MinRTT.
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rtt_sample = (65 * time.Millisecond)
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rttStats.UpdateRTT(rtt_sample, 0, now)
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Expect(rttStats.MinRTT()).To(Equal((10 * time.Millisecond)))
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Expect(rttStats.GetQuarterWindowRTT()).To(Equal(rtt_sample))
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Expect(rttStats.GetHalfWindowRTT()).To(Equal(rtt_sample))
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Expect(rttStats.RecentMinRTT()).To(Equal(rtt_sample))
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// A new all time low sets both the MinRTT and the RecentMinRTT.
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rtt_sample = (5 * time.Millisecond)
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rttStats.UpdateRTT(rtt_sample, 0, now)
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Expect(rttStats.MinRTT()).To(Equal(rtt_sample))
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Expect(rttStats.GetQuarterWindowRTT()).To(Equal(rtt_sample))
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Expect(rttStats.GetHalfWindowRTT()).To(Equal(rtt_sample))
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Expect(rttStats.RecentMinRTT()).To(Equal(rtt_sample))
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})
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It("ExpireSmoothedMetrics", func() {
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initial_rtt := (10 * time.Millisecond)
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rttStats.UpdateRTT(initial_rtt, 0, time.Time{})
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Expect(rttStats.MinRTT()).To(Equal(initial_rtt))
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Expect(rttStats.RecentMinRTT()).To(Equal(initial_rtt))
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Expect(rttStats.SmoothedRTT()).To(Equal(initial_rtt))
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Expect(rttStats.MeanDeviation()).To(Equal(initial_rtt / 2))
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// Update once with a 20ms RTT.
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doubled_rtt := initial_rtt * (2)
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rttStats.UpdateRTT(doubled_rtt, 0, time.Time{})
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Expect(rttStats.SmoothedRTT()).To(Equal(time.Duration(float32(initial_rtt) * 1.125)))
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// Expire the smoothed metrics, increasing smoothed rtt and mean deviation.
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rttStats.ExpireSmoothedMetrics()
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Expect(rttStats.SmoothedRTT()).To(Equal(doubled_rtt))
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Expect(rttStats.MeanDeviation()).To(Equal(time.Duration(float32(initial_rtt) * 0.875)))
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// Now go back down to 5ms and expire the smoothed metrics, and ensure the
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// mean deviation increases to 15ms.
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half_rtt := initial_rtt / 2
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rttStats.UpdateRTT(half_rtt, 0, time.Time{})
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Expect(doubled_rtt).To(BeNumerically(">", rttStats.SmoothedRTT()))
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Expect(initial_rtt).To(BeNumerically("<", rttStats.MeanDeviation()))
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})
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It("UpdateRTTWithBadSendDeltas", func() {
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// Make sure we ignore bad RTTs.
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// base::test::MockLog log;
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initial_rtt := (10 * time.Millisecond)
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rttStats.UpdateRTT(initial_rtt, 0, time.Time{})
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Expect(rttStats.MinRTT()).To(Equal(initial_rtt))
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Expect(rttStats.RecentMinRTT()).To(Equal(initial_rtt))
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Expect(rttStats.SmoothedRTT()).To(Equal(initial_rtt))
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bad_send_deltas := []time.Duration{
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0,
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utils.InfDuration,
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-1000 * time.Microsecond,
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}
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// log.StartCapturingLogs();
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for _, bad_send_delta := range bad_send_deltas {
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// SCOPED_TRACE(Message() << "bad_send_delta = "
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// << bad_send_delta.ToMicroseconds());
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// EXPECT_CALL(log, Log(LOG_WARNING, _, _, _, HasSubstr("Ignoring")));
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rttStats.UpdateRTT(bad_send_delta, 0, time.Time{})
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Expect(rttStats.MinRTT()).To(Equal(initial_rtt))
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Expect(rttStats.RecentMinRTT()).To(Equal(initial_rtt))
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Expect(rttStats.SmoothedRTT()).To(Equal(initial_rtt))
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}
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})
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It("ResetAfterConnectionMigrations", func() {
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rttStats.UpdateRTT((300 * time.Millisecond), (100 * time.Millisecond), time.Time{})
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Expect(rttStats.LatestRTT()).To(Equal((200 * time.Millisecond)))
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Expect(rttStats.SmoothedRTT()).To(Equal((200 * time.Millisecond)))
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Expect(rttStats.MinRTT()).To(Equal((300 * time.Millisecond)))
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Expect(rttStats.RecentMinRTT()).To(Equal(300 * time.Millisecond))
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// Reset rtt stats on connection migrations.
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rttStats.OnConnectionMigration()
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Expect(rttStats.LatestRTT()).To(Equal(time.Duration(0)))
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Expect(rttStats.SmoothedRTT()).To(Equal(time.Duration(0)))
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Expect(rttStats.MinRTT()).To(Equal(time.Duration(0)))
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Expect(rttStats.RecentMinRTT()).To(Equal(time.Duration(0)))
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})
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})
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