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Hardware lock-in cleanup: ice RX counter set and by-driver map collapsed to the single ixgbe nicRxFields list (newNICPoller drops its redundant driver gate), checkCoalesce loses the try-tx-then-EINVAL fallback and sets rx-usecs shared with tx as the one path, ice-attributed comments neutralized, dead errs.total removed with its redundant test assertion; ice counter reference set recorded in docs/nics/e810; verified on hardware (20.00G, zero errors, ECD 41m)

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flamingcow
2026-08-17 12:45:41 -07:00
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docs/nics/x520/README.md
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- PCIe Gen2 ×8 (5 GT/s, 32 Gb/s raw, ~25–26 Gb/s/dir effective vs 20 needed) — enough for 2×10G full duplex at the default mix; the 64 B case was host-bound already on the E810. Verify 5 GT/s ×8 trained (`lspci -vv`).
- Loss attribution survives here: missed-packet (RXMPC → `rx_missed_errors`) and per-queue drop (QPRDC) counters — "prove host-side zero" works.
- The RX error counter set is the 82599's slimmer one (`counters.go`): no jabber, fragment, illegal-byte or MAC-fault counters exist — crc/missed/length errors are what this link reports; the ice set remains the richer reference.
- ixgbe's mixed rx/tx interrupt vectors reject a tx-specific coalesce value; `checkCoalesce` falls back to rx-shared-with-tx on EINVAL, which is the normal path here. The full rx=8160/tx=4096 ring ask is taken as-is.
- The RX error counter set is the 82599's slimmer one (`counters.go`): no jabber, fragment, illegal-byte or MAC-fault counters exist — crc/missed/length errors are what this link reports; the richer ice reference set is recorded in [../e810/README.md](../e810/README.md).
- ixgbe's mixed rx/tx interrupt vectors take one moderation value per vector, so `checkCoalesce` sets rx-usecs shared with tx. The full rx=8160/tx=4096 ring ask is taken as-is.
- **`allow_unsupported_sfp=1` is mandatory** (`ixgbe_main.c:165`): the FS module's honest 10GBASE-T EEPROM fails Intel qualification and kills the whole port probe (error -95, no netdev). `load-ixgbe` passes it.
## The smoothed-bucket rate: read-time buckets, backward smear, no hardware stamps