| rep | uptime | MB/s |
|----:|-------:|-----:|
| 1 | 544s | 2.289|
| 2 | 716s | 2.165|
| 3 | 750s | 2.376|
N=3 mean: 2.277 MB/s. vs Patch C v3 N=3 (2.352 MB/s): -3% (within
rep variance). vs Patch B baseline (1.362 MB/s): +67%.
C2 was predicted in §4.5 of the Phase 4 plan as a possible
"<2% delta" outcome -> "ship for upstream-cleanliness anyway".
Observed -3% -> within noise -> ship. The tasklet hop in
ieee80211_rx_irqsafe was apparently cheap on this kernel.
Phase 8 lesson: _irqsafe -> _rx_ni is a CORRECTNESS / kernel.org-
submission move, not a performance optimization. Don't oversell
predicted throughput deltas without prior measurement.
Patch C v3 architectural win remains the durable +73%; D / E / C2 /
F / G are smaller cleanups that don't compound visibly above noise.
Throughput ceiling on this hardware: ~2.4 MB/s sustained @ 4 MB/s
sender, fresh chip. Further improvement needs firmware-side fixes
(wsm_generic_confirm 0x0007 path), not driver-side.
claude-noether
02d3f4b222