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|
package congestion
import (
"time"
"github.com/quic-go/quic-go/internal/protocol"
. "github.com/onsi/ginkgo/v2"
. "github.com/onsi/gomega"
)
var _ = Describe("Hybrid slow start", func() {
var slowStart HybridSlowStart
BeforeEach(func() {
slowStart = HybridSlowStart{}
})
It("works in a simple case", func() {
packetNumber := protocol.PacketNumber(1)
endPacketNumber := protocol.PacketNumber(3)
slowStart.StartReceiveRound(endPacketNumber)
packetNumber++
Expect(slowStart.IsEndOfRound(packetNumber)).To(BeFalse())
// Test duplicates.
Expect(slowStart.IsEndOfRound(packetNumber)).To(BeFalse())
packetNumber++
Expect(slowStart.IsEndOfRound(packetNumber)).To(BeFalse())
packetNumber++
Expect(slowStart.IsEndOfRound(packetNumber)).To(BeTrue())
// Test without a new registered end_packet_number;
packetNumber++
Expect(slowStart.IsEndOfRound(packetNumber)).To(BeTrue())
endPacketNumber = 20
slowStart.StartReceiveRound(endPacketNumber)
for packetNumber < endPacketNumber {
packetNumber++
Expect(slowStart.IsEndOfRound(packetNumber)).To(BeFalse())
}
packetNumber++
Expect(slowStart.IsEndOfRound(packetNumber)).To(BeTrue())
})
It("works with delay", func() {
rtt := 60 * time.Millisecond
// We expect to detect the increase at +1/8 of the RTT; hence at a typical
// RTT of 60ms the detection will happen at 67.5 ms.
const hybridStartMinSamples = 8 // Number of acks required to trigger.
endPacketNumber := protocol.PacketNumber(1)
endPacketNumber++
slowStart.StartReceiveRound(endPacketNumber)
// Will not trigger since our lowest RTT in our burst is the same as the long
// term RTT provided.
for n := 0; n < hybridStartMinSamples; n++ {
Expect(slowStart.ShouldExitSlowStart(rtt+time.Duration(n)*time.Millisecond, rtt, 100)).To(BeFalse())
}
endPacketNumber++
slowStart.StartReceiveRound(endPacketNumber)
for n := 1; n < hybridStartMinSamples; n++ {
Expect(slowStart.ShouldExitSlowStart(rtt+(time.Duration(n)+10)*time.Millisecond, rtt, 100)).To(BeFalse())
}
// Expect to trigger since all packets in this burst was above the long term
// RTT provided.
Expect(slowStart.ShouldExitSlowStart(rtt+10*time.Millisecond, rtt, 100)).To(BeTrue())
})
})
|
