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rewrite flow control auto-tuning

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This commit is contained in:
Marten Seemann 2017-12-21 15:29:47 +07:00
parent ac05343b00
commit f7526b9883
5 changed files with 118 additions and 78 deletions
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23
internal/flowcontrol/stream_flow_controller_test.go
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@ -168,32 +168,35 @@ var _ = Describe("Stream Flow controller", func() {
BeforeEach(func() {
controller.receiveWindow = 100
controller.receiveWindowSize = 60
controller.bytesRead = 100 - 60
controller.connection.(*connectionFlowController).receiveWindowSize = 120
oldWindowSize = controller.receiveWindowSize
})
It("tells the connection flow controller when the window was autotuned", func() {
oldOffset := controller.bytesRead
controller.contributesToConnection = true
controller.AddBytesRead(75)
rtt := 20 * time.Millisecond
setRtt(rtt)
controller.lastWindowUpdateTime = time.Now().Add(-4*protocol.WindowUpdateThreshold*rtt + time.Millisecond)
setRtt(20 * time.Millisecond)
controller.epochStartOffset = oldOffset
controller.epochStartTime = time.Now().Add(-time.Millisecond)
controller.AddBytesRead(55)
offset := controller.GetWindowUpdate()
Expect(offset).To(Equal(protocol.ByteCount(75 + 2*60)))
Expect(offset).To(Equal(protocol.ByteCount(oldOffset + 55 + 2*oldWindowSize)))
Expect(controller.receiveWindowSize).To(Equal(2 * oldWindowSize))
Expect(controller.connection.(*connectionFlowController).receiveWindowSize).To(Equal(protocol.ByteCount(float64(controller.receiveWindowSize) * protocol.ConnectionFlowControlMultiplier)))
})
It("doesn't tell the connection flow controller if it doesn't contribute", func() {
oldOffset := controller.bytesRead
controller.contributesToConnection = false
controller.AddBytesRead(75)
rtt := 20 * time.Millisecond
setRtt(rtt)
controller.lastWindowUpdateTime = time.Now().Add(-4*protocol.WindowUpdateThreshold*rtt + time.Millisecond)
setRtt(20 * time.Millisecond)
controller.epochStartOffset = oldOffset
controller.epochStartTime = time.Now().Add(-time.Millisecond)
controller.AddBytesRead(55)
offset := controller.GetWindowUpdate()
Expect(offset).ToNot(BeZero())
Expect(controller.receiveWindowSize).To(Equal(2 * oldWindowSize))
Expect(controller.connection.(*connectionFlowController).receiveWindowSize).To(Equal(protocol.ByteCount(120))) // unchanged
Expect(controller.connection.(*connectionFlowController).receiveWindowSize).To(Equal(protocol.ByteCount(2 * oldWindowSize))) // unchanged
})
It("doesn't increase the window after a final offset was already received", func() {