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Update draft-ietf-quic-recovery.md
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ianswett committed Mar 9, 2020
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12 changes: 6 additions & 6 deletions draft-ietf-quic-recovery.md
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Expand Up @@ -239,12 +239,12 @@ declared and instead allows probe packets to temporarily exceed the congestion
window whenever the timer expires.

In doing this, QUIC avoids unnecessary congestion window reductions, obviating
the need for correcting mechanisms such as F-RTO {{!RFC5682}}.
Since QUIC does not collapse the congestion window on a PTO expiration, a QUIC
sender is not limited from sending more in-flight packets after a PTO expiration
if it still has available congestion window. This occurs when a sender is
application-limited and then the PTO timer expires. This is more aggressive than
TCP's RTO mechanism when application-limited, but identical when not
the need for correcting mechanisms such as F-RTO {{!RFC5682}}. Since QUIC does
not collapse the congestion window on a PTO expiration, a QUIC sender is not
limited from sending more in-flight packets after a PTO expiration if it still
has available congestion window. This occurs when a sender is
application-limited and then the PTO timer expires. This is more aggressive
than TCP's RTO mechanism when application-limited, but identical when not
application-limited.

A single packet loss at the tail does not indicate persistent congestion, so
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