N=3 stress reps on ohm with v3 module (srcversion 371C6606B73AF19299228CA),
3 min @ 4 MB/s each, all within fresh-chip uptime window (200/391/582 s).
| rep | MB/s | sdio_rx_work | bh_work redispatches |
|----:|----:|-:|-:|
| 1 | 2.363 | 0 | 0 |
| 2 | 2.590 | 0 | 0 |
| 3 | 2.102 | 0 | 0 |
N=3 mean: 2.352 MB/s · median 2.363 MB/s · min 2.102 MB/s.
vs Patch B baseline (1.362 MB/s, run-20260507-patchC-preflight): +73%.
vs original Bug #5 floor (75 KB/s rep 3 death): 28× improvement.
Plan §4.5 prediction verified:
- sdio_rx_work dispatch rate: 86.4/s -> 0/s (function deleted)
- bes2600_bh_work redispatches: 0 (preserved invariant)
- observed receive @ 4 MB/s: floor lifts toward >= 1 MB/s (exceeded —
floor is 2.10 MB/s)
Bonus finding: sdio_tx_work dispatch rate dropped from 276.1/s to
0.8/s. The post-tx queue_work(rx_work) call I rewired to
self->irq_handler() was actually firing more often than predicted;
folding it into bh-wake-up cuts ~99.7% of the workqueue dispatches.
No WARN/BUG/oops on any rep — the v2 race that wedged Patch C v1
within 13 s under stress did NOT reproduce on v3.
Phase 8 lesson distilled as feedback_mine_upstream_ancestor memory:
when patching a fork-from-upstream driver, mine the ancestor's
fix history BEFORE writing fixes from scratch. cw1200 mining
drove the structural pivot from v2's atomic_t wrapper to v3's
no-relay architecture. Without the mine, we'd have shipped v2.
Phase 7 receipts checklist met (N=3, fresh-chip, identical
instrumentation, predicted delta verified, no-WARN under stress).
claude-noether
3a38286e6f