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Under load the relay collapsed with cores to spare, for two reasons a load test showed. Its one UDP socket kept the kernel's default buffer, about 212 KB. Each fan-out's acknowledgements arrive together, so at 2,000 viewers of 2 Mbit/s the kernel dropped about a million packets in 20 seconds. A dropped acknowledgement reads as loss: a retransmission and a smaller congestion window. The buffer is now a setting, 4 MiB by default, for the sockets the relay listens on and dials from. The system caps it, so the relay warns when it gets less. Each subscriber also got its own copy of every payload, while the fan-out held the relay's one lock, and two more copies on the way to the wire. An object is now held once, from when it is read until the last QUIC stream has it acknowledged. The cache, every session's queue and every QUIC send buffer share one allocation, and a keyframe stops being N keyframes in memory. A transport that keeps no buffers still copies, once, where it writes, and a bridge to an earlier draft still gets an object's head and payload as one write. `examples/fanout_load.rs` is the load test. A bystander on its own track measures what the audience costs everyone else on the relay. Co-Authored-By: Claude Opus 5.5 <[email protected]> |
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| .. | ||
| joule-code-cargo | ||
| joule-code-cascade | ||
| joule-code-collab | ||
| joule-code-conformance | ||
| joule-code-identity | ||
| joule-code-jcp | ||
| joule-code-joulecontract | ||
| joule-code-receipt | ||
| joule-code-release | ||
| joule-code-remediate | ||
| joule-code-review | ||
| joule-code-reviewer | ||
| joule-code-schema | ||
| joule-code-spec | ||
| joule-contrib | ||
| joule-moq | ||
| joule-moq-ingest | ||
| joule-moq-interop | ||
| joule-moq-mls | ||
| joule-moq-relay | ||
| joule-moq-remote | ||
| joule-moq-room | ||
| joule-moq-web | ||
| jwp | ||
| lockstep-quic | ||