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don't use a lower RTT than 5ms after receiving a Retry packet

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This commit is contained in:
Marten Seemann 2021-03-26 15:55:30 +07:00
parent 81d16a9903
commit d48c08037a
2 changed files with 19 additions and 1 deletions
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5
internal/ackhandler/sent_packet_handler.go
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@ -21,6 +21,8 @@ const (
packetThreshold = 3
// Before validating the client's address, the server won't send more than 3x bytes than it received.
amplificationFactor = 3
// We use Retry packets to derive an RTT estimate. Make sure we don't set the RTT to a super low value yet.
minRTTAfterRetry = 5 * time.Millisecond
)
type packetNumberSpace struct {
@ -768,8 +770,9 @@ func (h *sentPacketHandler) ResetForRetry() error {
// Only use the Retry to estimate the RTT if we didn't send any retransmission for the Initial.
// Otherwise, we don't know which Initial the Retry was sent in response to.
if h.ptoCount == 0 {
// Don't set the RTT to a value lower than 5ms here.
now := time.Now()
h.rttStats.UpdateRTT(now.Sub(firstPacketSendTime), 0, now)
h.rttStats.UpdateRTT(utils.MaxDuration(minRTTAfterRetry, now.Sub(firstPacketSendTime)), 0, now)
if h.logger.Debug() {
h.logger.Debugf("\tupdated RTT: %s (σ: %s)", h.rttStats.SmoothedRTT(), h.rttStats.MeanDeviation())
}