pub const DEFAULT_INITIAL_RTT_MS: u64 = 333;Expand description
Default round-trip time assumed before the first measurement, in milliseconds.
quinn’s own default, straight from RFC 9002’s kInitialRtt. It seeds the
loss-recovery timers during the handshake, when no RTT sample exists yet: a
lost handshake packet waits roughly three times this value before it is
resent. On a path whose RTT is known (the rtt_ms field in the connection
logs), 1.5–2x that measurement recovers a lost handshake in a fraction of
the default wait. The margin is not optional: a value below the real RTT
makes the timer fire early and retransmit packets that were never lost.