joule-contrib: an SRT sender probes a stalled tail, so a lost newest packet is recovered #503
2026-10-26
joule-contrib: an SRT sender probes a stalled tail; live-contribution §4.1 says so
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A receiver finds a gap only behind a later arrival, so a lost newest packet went unrecovered until the sender expired it. Under contention (four at a time on two cores) an_srt_publisher_reaches_a_relay_subscriber_with_every_receipt failed 4 of 32 and 17 of 48: the sender's counts read expired=1 and the gateway's parts covered 107 of the 108 sequence numbers sent. CI's linux-arm64 leg failed the same test on #499. When the acknowledged position has not moved for 2 x RTT + 20 ms and the newest packet held went out that long ago, the sender sends it again with the R flag, the wait doubling per probe to 16 times the first, reset when an ACK takes a packet. SendCounts::probes counts them apart from retransmitted, which answers requests. The test now also requires that the publisher gave nothing up (expired == 0). Co-Authored-By: Claude Opus 5.5 <[email protected]>
joule-contrib: count what an SRT sender holds unacknowledged; the SRT ingest test closes after the drain
an_srt_publisher_reaches_a_relay_subscriber_with_every_receipt closed the publisher a fixed 800 ms after its last frame. On a loaded host a loss on the 3%-lossy path was still unrecovered then: the gateway counted 107 of 108 payloads delivered and one outstanding (4 failures in 32 runs, four at a time on two cores; CI's linux-arm64 leg failed it on #499). The sender now keeps `SendCounts::unacknowledged` (SRT; RIST acknowledges nothing and leaves it 0), and the test closes once it is 0. The end-code assertion now says which code it read. Co-Authored-By: Claude Opus 5.5 <[email protected]>