P110 took the auxiliary response lane from “a raw word plus a handful of candidate wires” to a tagged response record:
valid
owner
addr
data
error
cancelThis is still same-cycle in the Verilator memory model. It is not yet a registered miss-status holding register. The point is ownership: P111 can now pick an owner and add queueing or delayed completion without inventing a new response convention.
Measured owner counts:
| owner | responses |
|---|---|
| writeback prefetch | 488,037 |
| D-cache background | 9,984,598 |
| all other owners | 0 |
| errors | 0 |
| cancels | 0 |
Shell smoke reached P110-FILE-OK.
| metric | value |
|---|---|
| post-load cycles | 217,717,374 |
| shell-window cycles | 63,761,231 |
| retired instructions | 86,014,057 |
| CPI | 2.5312 |
| S_FETCH cycles | 7,613,966 |
| aux reads total | 10,472,635 |
The shell window measured faster than P109, but this rung should mostly be treated as a contract cleanup. The useful fact is that Linux and BusyBox still run while every consumed auxiliary response goes through one owner-tagged shape.
Next: use the tagged response slot for a real nonblocking data-side client, probably aligned integer load miss service.