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FastRIO v2 bench: CLEAN — ACK-wait widening eliminates the retry storm

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192s mash at 31250 with the $D9E7 wait fix: framing 5655 -> 54
(-99.4%), AbandonCount 65 -> +0, duplicate replies gone (215% -> 88.6%
of poll slots — identical to the healthy 9600 profile, the structural
$D758 drop-gate ratio), zero wedges, counters perfectly flat. The
byte-clocked ACK-wait theory is confirmed end to end: disassembly
predicted the mechanism, one operand byte fixed it, the wire went
quiet. Evidence log archived; results table in ANALYSIS.md.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Cyd
2026-07-18 11:13:38 -05:00
co-authored by Claude Fable 5
parent dd41a3a411
commit f489bd340e
2 changed files with 54 additions and 0 deletions
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RIOv4_2-ANALYSIS.md
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@@ -282,3 +282,25 @@ sha256 `420d4cfc6b513651687982a70db2daeecda7bd00a5324321e272f35b95dca753`,
25 bytes vs original; re-disassembly diff vs the v1 31250 image is exactly
the one CMPA operand line. Expected on the bench: framing 5655 → ~0,
Abandon 65 → ~0, wedges 0 → 0.
### 31250 v2 bench results (2026-07-18) — CLEAN. Byte-clock theory confirmed.
`testlogs/riomash-patched-31250v2-20260718-110853.log` (192s mash):
| metric | v1 @31250 | v2 @31250 (ACK-wait $28) |
|-------------------|----------------|--------------------------|
| framing resyncs | 5655 (~45/s) | **54 (~0.3/s, -99.4%)** |
| Abandon delta | 65 | **+0** |
| Restart delta | 2 | **+0** |
| analog vs polls | 215% (dupes) | **88.6% (no dupes)** |
| wedge events | 0 | **0** |
| worst mid-run gap | 0.09s (steady) | 0.14s (tail <100ms) |
The 88.6% delivery ratio equals the healthy 9600 patched profile (87.5%)
— the deficit is the $D758 in-flight drop gate, identical at both rates,
i.e. structural, not a v2 artifact. Counters perfectly flat: the board
never entered retry escalation in 192s. FastRIO is now *clean*, not
just survivable. To actually harvest the bandwidth, the next dial is
host-side: drop the 55ms analog poll interval (the board now answers in
~4.6ms of wire time). Cabinet adoption still gated on game-side baud
patches; 9600 patched chip remains the production standard meanwhile.