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Update draft-ietf-quic-recovery.md
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ianswett committed Jul 3, 2019
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Expand Up @@ -544,22 +544,22 @@ delay sending an acknowledgement.
The PTO value MUST be set to at least kGranularity, to avoid the timer expiring
immediately.

When a PTO timer expires, the sender probes the network as described in the next
section. The PTO period MUST be set to twice its current value. This exponential
reduction in the sender's rate is important because the PTOs might be caused by
loss of packets or acknowledgements due to severe congestion.
When a PTO timer expires, the PTO period MUST be set to twice its current
value. This exponential reduction in the sender's rate is important because
the PTOs might be caused by loss of packets or acknowledgements due to severe
congestion.

A sender computes its PTO timer every time an ack-eliciting packet is sent. A
sender might choose to optimize this by setting the timer fewer times if it
knows that more ack-eliciting packets will be sent within a short period of
time.

The probe timer is not set if the time threshold
{{time-threshold}} loss detection timer is set. The time threshold loss
detection timer is expected to both expire earlier than the PTO and be less
likely to spuriously retransmit data. The Initial and Handshake packet number
spaces will typically contain a small number of packets, so losses are less
likely to be detected using packet-threshold loss detection.
The probe timer is not set if the time threshold {{time-threshold}} loss
detection timer is set. The time threshold loss detection timer is expected
to both expire earlier than the PTO and be less likely to spuriously retransmit
data. The Initial and Handshake packet number spaces will typically contain a
small number of packets, so losses are less likely to be detected using
packet-threshold loss detection.

## Handshakes and new paths

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