76 lines
2.2 KiB
Go
76 lines
2.2 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/protocol"
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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("Hybrid slow start", func() {
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var (
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slowStart HybridSlowStart
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)
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BeforeEach(func() {
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slowStart = HybridSlowStart{}
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})
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It("works in a simple case", func() {
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packet_number := protocol.PacketNumber(1)
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end_packet_number := protocol.PacketNumber(3)
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slowStart.StartReceiveRound(end_packet_number)
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packet_number++
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Expect(slowStart.IsEndOfRound(packet_number)).To(BeFalse())
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// Test duplicates.
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Expect(slowStart.IsEndOfRound(packet_number)).To(BeFalse())
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packet_number++
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Expect(slowStart.IsEndOfRound(packet_number)).To(BeFalse())
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packet_number++
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Expect(slowStart.IsEndOfRound(packet_number)).To(BeTrue())
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// Test without a new registered end_packet_number;
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packet_number++
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Expect(slowStart.IsEndOfRound(packet_number)).To(BeTrue())
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end_packet_number = 20
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slowStart.StartReceiveRound(end_packet_number)
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for packet_number < end_packet_number {
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packet_number++
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Expect(slowStart.IsEndOfRound(packet_number)).To(BeFalse())
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}
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packet_number++
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Expect(slowStart.IsEndOfRound(packet_number)).To(BeTrue())
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})
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It("works with delay", func() {
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rtt := 60 * time.Millisecond
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// We expect to detect the increase at +1/8 of the RTT; hence at a typical
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// RTT of 60ms the detection will happen at 67.5 ms.
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const kHybridStartMinSamples = 8 // Number of acks required to trigger.
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end_packet_number := protocol.PacketNumber(1)
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end_packet_number++
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slowStart.StartReceiveRound(end_packet_number)
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// Will not trigger since our lowest RTT in our burst is the same as the long
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// term RTT provided.
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for n := 0; n < kHybridStartMinSamples; n++ {
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Expect(slowStart.ShouldExitSlowStart(rtt+time.Duration(n)*time.Millisecond, rtt, 100)).To(BeFalse())
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}
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end_packet_number++
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slowStart.StartReceiveRound(end_packet_number)
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for n := 1; n < kHybridStartMinSamples; n++ {
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Expect(slowStart.ShouldExitSlowStart(rtt+(time.Duration(n)+10)*time.Millisecond, rtt, 100)).To(BeFalse())
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}
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// Expect to trigger since all packets in this burst was above the long term
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// RTT provided.
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Expect(slowStart.ShouldExitSlowStart(rtt+10*time.Millisecond, rtt, 100)).To(BeTrue())
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})
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})
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