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use a slightly higher bandwidth for the pacer

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This commit is contained in:
Marten Seemann 2020-06-18 21:09:15 +07:00
parent fe622dd780
commit fda00fe1cd
2 changed files with 20 additions and 13 deletions
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12
internal/congestion/pacer_test.go
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@ -12,12 +12,14 @@ import (
var _ = Describe("Pacer", func() {
var p *pacer
const packetsPerSecond = 42
const packetsPerSecond = 50
var bandwidth uint64 // in bytes/s
BeforeEach(func() {
bandwidth = uint64(packetsPerSecond * maxDatagramSize) // 42 full-size packets per second
p = newPacer(func() Bandwidth { return Bandwidth(bandwidth) * BytesPerSecond })
bandwidth = uint64(packetsPerSecond * maxDatagramSize) // 50 full-size packets per second
// The pacer will multiply the bandwidth with 1.25 to achieve a slightly higher pacing speed.
// For the tests, cancel out this factor, so we can do the math using the exact bandwidth.
p = newPacer(func() Bandwidth { return Bandwidth(bandwidth) * BytesPerSecond * 4 / 5 })
})
It("allows a burst at the beginning", func() {
@ -96,8 +98,8 @@ var _ = Describe("Pacer", func() {
It("changes the bandwidth", func() {
t := time.Now()
sendBurst(t)
bandwidth = uint64(maxDatagramSize) // reduce the bandwidth to 1 packet per second
Expect(p.TimeUntilSend()).To(Equal(t.Add(time.Second)))
bandwidth = uint64(5 * maxDatagramSize) // reduce the bandwidth to 5 packet per second
Expect(p.TimeUntilSend()).To(Equal(t.Add(time.Second / 5)))
})
It("doesn't pace faster than the minimum pacing duration", func() {