joule-contrib: a retransmission of a packet not yet seen is recovered; the SRT tests count the first sends lost #510
2026-10-27
joule-contrib: a retransmission of a packet not yet seen is recovered, not a first try (live-contribution §6.1)
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A receiver marked a packet recovered only when a later arrival had shown its gap. A sender's probe of a stalled tail (§4.1) re-sends the newest packet before anything shows the gap, so the SRT receiver took it, R flag and all, as the next packet in order and counted a first try for a packet whose first send was lost. The counted recoveries came up short of the first sends the path dropped (6-9 short-counted in 32 contended runs of the SRT ingest test). Both receivers now treat an arrival flagged as a retransmission (SRT's R flag, RIST's retransmission SSRC) of a sequence number not yet seen and not known missing as found missing on arrival: recovered, with a recovery of 0 µs. §6.1 says so, and the CHANGELOG. Co-Authored-By: Claude Opus 5.5 <[email protected]>
SRT tests: count the first sends the proxy dropped, rather than assume a burst's size
an_srt_publisher_reaches_a_relay_subscriber_with_every_receipt required at least six recoveries from a burst of six dropped datagrams, and losses_each_way_are_recovered_within_the_window five from five. A burst drops datagrams by index, and the control packets between data packets (ACKACKs, keepalives) take some of those indexes as the timing falls: CI's linux-arm64 leg saw 4 recoveries on #505 with every payload delivered and nothing dropped. The lossy proxy now keeps the datagrams it drops (Counts::dropped_log, the first 4096), protocol-agnostic. The two tests read from it the sequence numbers whose first send was lost and require exactly that many recovered, and srt_link a loss run at least as long as the longest run of them. Co-Authored-By: Claude Opus 5.5 <[email protected]>