Files
VerseVDI-Data-Plane/openspec/changes/truthful-fixed-frame-qualification/proposal.md
T
sechmachine ce3b307983
Verify Data Plane / gateway (push) Successful in 4m40s
test(gateway): retain raw wire qualification evidence
2026-08-10 02:42:54 +07:00

5.5 KiB

Why

The existing fixed-profile harness treats each 1,179-byte datagram as an encoded frame, so its reported frame rate, frame boundaries, bitrate, queue pressure, and processing evidence do not model the named 60/120 FPS profiles.

The v6 complete-frame fixture subsequently exposed a source-fidelity defect on ordinary Linux runners: it emitted every UDP shard in one tight loop, unlike pinned Apollo's bounded intra-frame rate and batch schedule. The affected v6 qualification evidence remains retained but is superseded for candidate-readiness purposes.

Private Linux run 125 then demonstrated a separate production-ingress defect after source pacing was corrected: 33 successful fixture writes missing from MediaIngress matched 33 measured kernel UDP drops while decrypt/FEC, queue, pacer, QUIC, and client counters remained downstream of the shortfall.

The consumed v8 Section 7 attempt at 55afea72 subsequently failed after accumulated host scheduling delays exposed the production pacer's discarded schedule debt beyond its 5 ms instantaneous catch-up allowance. The retained partial evidence remains failed and supersedes 55afea72 as a final executable candidate.

Private Linux run 127/job 481 at exact source 122080ab342d20585d9a45db0017337b9ece570a then failed TestQualificationLossAndSteppedThroughputBounds: the 25% capacity step reported the 11-second convergence sentinel and 5,207,475 bytes in the measured five-second window. The run produced no artifact and was not retried. Its retained log is /private/tmp/versevdi-gitea-run-127-job-481.log, SHA-256 2b368413d4b0e954c64ba6f6dcefb1e165166d773b6d8f84ee372bc2c92ff5f1; 122080ab is superseded as a final source candidate.

Private Linux run 128/job 482 was the single push-triggered attempt at exact source 22433e5c45c179e9d487b59e5d80f1dcf3b285ce. Linux make verify, the sustained gate, strict OpenSpec, deterministic artifact generation, upload, and the clean-checkout step passed. Artifact 28's binaries and SPDX matched the frozen hashes and source metadata. The retained log /private/tmp/versevdi-gitea-run-128-job-482.log has SHA-256 6f5852dce815ba87a55d61aae34cb2fce17a1a62c5ee50e18c0034259ad0a029. The workflow requested 30 retention days, but Gitea 1.27 floored the positive request delay and its API scheduled exactly 29 elapsed days. The run was not retried: it is passing Linux execution and artifact-byte evidence but retention-nonconforming, so it does not satisfy the private Linux artifact gate or authorize normative Section 7. The local 31-day request preserves the at-least-30-elapsed-day requirement; a separately authorized future run must prove expires_at - created_at >= 2,592,000 seconds.

At exact source c0e362c0285d267f8af4087d07943822311f60e1, the first Section 7 attempt created gateway-rc10-c0e362c and stopped at the sandbox loopback-bind boundary, leaving that mode-0750 directory empty. The separately authorized escalated attempt gateway-rc10-c0e362c-a2 then passed the v9 runtime gates and retained 16 files; its manifest has SHA-256 61ea55140dfe6b37332de03879ac33206dd5d47763d09fb0fc2f65bb1f8e02b4. Independent review denied normative acceptance because v9 retained only logical impairment rows and aggregate capacity summaries: it did not retain the raw public datagram timestamps/lengths or fairness transition offsets needed to recompute those summaries. Both attempts remain preserved without relabeling; a2 is runtime-passing but normative-raw-evidence-incomplete.

What Changes

  • Generate deterministic variable-size encoded frame units at the named frame rates and target bitrates, including bounded keyframes.
  • Traverse native Apollo recovery, production queues, the production pacer, QUIC framing, and independent reassembly.
  • Assert frame count/rate, bitrate, exact bytes and boundaries, clean loss attribution, latency, and resource bounds.
  • Decouple native video socket draining from the single decrypt/FEC processor with a fixed provider-scoped receive pool and request the source-backed video receive-buffer size.
  • Retain bounded valid per-flow pacing debt after a host stall and repay it at no more than 5% above nominal fair share.
  • Measure capacity convergence and rolling caps from each raw public QUIC datagram's observed length and receive time while retaining completed logical-payload observations for integrity and traversal results.
  • Persist the constrained public datagram observations and capacity transitions under one monotonic epoch, bind their hash/counts into the v10 manifest, and retain fairness transition offsets for independent recomputation. Impairment summaries use the full delivery tail after each transition; trusted caller input selects normative validation, and bounded readers reject oversized compressed, decompressed, and field data.
  • Keep short smoke tests separate and leave all prior normative artifacts unchanged.

Capabilities

New Capabilities

None.

Modified Capabilities

  • gateway-qualification: Fixed-profile evidence measures complete encoded frame units rather than one datagram per frame.

Impact

The qualification harness and its canonical specification, plus the already-reviewed native Apollo video ingress in gateway/apollo_native.go and production fair pacer in gateway/telemetry.go. This v10 correction changes test-only retained evidence, not production behavior. Downstream complete-frame queues, audio/control ingress, codec/FEC formats, QUIC, dependencies, and public interfaces remain unchanged. No codec operation or normative rerun is included. Requirements: P3C-002, P3C-008, P3C-029, P3C-030, P3C-033, VER-009, VER-010, OPS-015.