README: add benchmark comparison vs original fork (compatibility, llama-bench, MTP)

README.md

@@ -145,3 +145,65 @@ Measured resident memory of `llama-cli` with this model (`-c 512`, `-n 1`):
   534/534 tests pass
 - `test-chat`, `test-chat-template`, `test-chat-peg-parser`,
   `test-chat-auto-parser`: all pass
+
+## Comparison with the original fork
+
+Measured against the original
+[mrexodia/llama.cpp-openPangu-2.0-Flash](https://github.com/mrexodia/llama.cpp-openPangu-2.0-Flash)
+(HEAD `76c92350b`, llama.cpp base `6f4f53f2b` from 2026-06-29), same machine,
+same model, same flags.
+
+### Compatibility on this machine (AMX CPU)
+
+| | original fork | this port (v0.7.0) |
+|---|---|---|
+| default settings | **aborts** — `GGML_ASSERT(*cur_backend_id != -1)` during `sched_reserve` (AMX weight repacking) | runs |
+| `-nr` (weight repacking disabled) | runs | runs |
+
+The original fork cannot be used with default settings on a CPU with AMX.
+Its `llama-bench` has no option to disable repacking at all — the original
+numbers below required a local source edit. This port fixes the underlying
+AMX packing bug (the AMX packer silently corrupted batched/3D weights).
+
+### llama-bench, `Q3_K_M`, `-t 16 -r 3` (2026-10-16)
+
+Both builds with weight repacking disabled (`-nr`, the only common
+runnable configuration on this machine):
+
+| test | original fork | this port | change |
+|------|--------------:|----------:|-------:|
+| pp128 | 41.51 ± 2.21 | 60.47 ± 4.63 | **+46 %** |
+| pp512 | 42.62 ± 0.83 | 64.75 ± 2.26 | **+52 %** |
+| tg32  | 11.65 ± 0.19 | 11.52 ± 0.35 | ≈ |
+| tg128 | 11.47 ± 0.21 | 11.82 ± 0.72 | ≈ |
+
+This port with the default AMX weight repacking (original fork cannot run
+this configuration):
+
+| test | this port (default) |
+|------|--------------------:|
+| pp128 | 56.84 ± 1.32 |
+| pp512 | 62.65 ± 0.54 |
+| tg32  | 11.94 ± 0.71 |
+| tg128 | 12.02 ± 0.30 |
+
+Reading these numbers:
+
+- Prefill is ~1.5× faster than the original fork, mostly from the v0.7.0
+  base (3.5 months of upstream CPU optimizations). Generation is on par.
+- On this CPU, AMX weight repacking is performance-neutral and costs
+  ~16 GiB of extra RAM, so `-nr` is usually the better choice.
+- The host is shared and measurements vary between runs (see the ±).
+
+### MTP (self-speculative decoding)
+
+Same prompt, `llama-cli -n 128 -nr`:
+
+| | generation |
+|---|---|
+| original fork, MTP draft | 4.9 t/s |
+| this port, MTP draft | 4.7 t/s |
+| either fork, plain decoding (`llama-bench` tg128) | 11.5–12.0 t/s |
+
+On CPU the MTP draft head is a net loss in both forks; it is included for
+completeness and may pay off on GPUs where the draft forward pass is cheap.