initialRtt top-level constant

Duration const initialRtt

The smoothed RTT before the first sample (RFC 9002 section 6.2.2), with initialRttVar its variation: the first PTO is about a second. The estimate used to start at 100 ms, so on a slow path the first probe went out before the handshake could answer.

Implementation

const Duration initialRtt = Duration(milliseconds: 333);