wasm-emu: record store-TCI benchmark and keep reliable default

Benchmark showed the narrowed 32-bit-only fallback is slightly faster when it works but failed once with an app-init watchdog. Restore blanket store-TCI as the default and document the narrowed result as diagnostic only.
2026-07-22 19:47:47 -04:00
parent 4b1a0d72a2
commit fc2ec8a6ae
2 changed files with 15 additions and 1 deletions
@@ -434,3 +434,17 @@ normal URL: browser raw-sd test passed, open example.txt took 36.8s
 This fixes the browser panic without disabling dynamic promotion globally. The
 remaining upstream-quality improvement would be eliminating the 32-bit store-TCI
 subset entirely by finding the exact cross-width/shared-memory state bug.
+
+### E14 benchmark correction — 32-bit-only fallback rejected as default
+
+A 3-run benchmark changed the decision:
+
+| fallback | result | open times |
+| --- | --- | --- |
+| 32-bit-store-only TCI | 2 pass, 1 app-init watchdog | 34.0s, 33.8s |
+| blanket store-TCI | 3 pass | 35.3s, 36.6s, 34.3s |
+
+The narrowed fallback is a little faster when it works, but it is not reliable
+enough: one run failed before controls enabled with an interrupt watchdog. The
+default is restored to the upstream blanket store-TCI fallback. Keep the
+32-bit-only result as a useful diagnostic, not a production fix.