tree f671ebc9e81ef075e8df297e35f62d82bc8888bd
parent ebe10d973e11cb6a6c41c8a5c21cd2f5bc001faa
author dmcardle <dmcardle@google.com> 1765391578 -0800
committer Copybara-Service <copybara-worker@google.com> 1765391640 -0800

Avoid computing a negative RTT in BandwidthSampler::OnPacketAcknowledged()

It's technically possible for the ACK time to precede the corresponding packet's send time. I've created an Envoy PR that prevents this from occurring: https://github.com/envoyproxy/envoy/pull/42135

This CL adds a flag-protected branch that prevents BandwidthSampler from computing a negative RTT. It also adds a code count for the condition that the ACK and send time are out of order: quic_bandwidth_sampler_ack_time_before_sent_time.

Protected by quic_reloadable_flag_quic_bandwidth_sampler_guard_rtt_subtraction.

PiperOrigin-RevId: 842784781