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move calculation of RTO delay to the sent packet handler

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This commit is contained in:
Marten Seemann 2018-04-16 11:18:14 +09:00
parent ef286afa3c
commit 2b9b949855
6 changed files with 8 additions and 52 deletions
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27
internal/congestion/cubic_sender_test.go
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@ -397,33 +397,6 @@ var _ = Describe("Cubic Sender", func() {
Expect(sender.GetCongestionWindow()).To(Equal(defaultWindowTCP))
})
It("retransmission delay", func() {
const rtt = 10 * time.Millisecond
const deviation = 3 * time.Millisecond
Expect(sender.RetransmissionDelay()).To(BeZero())
rttStats.UpdateRTT(rtt, 0, clock.Now())
// Initial value is to set the median deviation to half of the initial
// rtt, the median in then multiplied by a factor of 4 and finally the
// smoothed rtt is added which is the initial rtt.
expectedDelay := rtt + rtt/2*4
Expect(sender.RetransmissionDelay()).To(Equal(expectedDelay))
for i := 0; i < 100; i++ {
// run to make sure that we converge.
rttStats.UpdateRTT(rtt+deviation, 0, clock.Now())
rttStats.UpdateRTT(rtt-deviation, 0, clock.Now())
}
expectedDelay = rtt + deviation*4
Expect(rttStats.SmoothedRTT()).To(BeNumerically("~", rtt, time.Millisecond))
Expect(sender.RetransmissionDelay()).To(BeNumerically("~", expectedDelay, time.Millisecond))
Expect(sender.BandwidthEstimate() / BytesPerSecond).To(Equal(Bandwidth(
sender.GetCongestionWindow() * protocol.ByteCount(time.Second) / protocol.ByteCount(rttStats.SmoothedRTT()),
)))
})
It("slow start max send window", func() {
const maxCongestionWindowTCP = 50
const numberOfAcks = 100