perf(guest): route all guest keccak through the chip via a vendored t… - #885
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perf(guest): route all guest keccak through the chip via a vendored t…#885diegokingston wants to merge 6 commits into
diegokingston wants to merge 6 commits into
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…iny-keccak patch ethrex's free-fn keccak_hash path (trie/RLP/tx hashing) bypasses the Crypto trait, so ~6% of a 20-tx block ran tiny_keccak's pure-Rust keccakf in the guest despite the keccak chip. Vendor tiny-keccak 2.0.2 under crypto/tiny-keccak with a one-hunk patch: on riscv64, keccakf calls the keccak_permute ecall; host keeps the software impl. Activated via [patch.crates-io] in the ethrex guest workspace (same pattern as sp1-patches/tiny-keccak). Measured vs origin/main (same fixtures, deterministic): transfers_20 8,732,213 -> 8,461,843 (-270,370, -3.1%) erc20_20 10,328,222 -> 9,929,487 (-398,735, -3.9%) mixed_20 9,817,444 -> 9,450,857 (-366,587, -3.7%) software tiny_keccak::keccakf in the guest flamegraph: 397k -> 0 (erc20_20). Verified: test_prove_ethrex_empty_block (prove+verify) passes.
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Benchmark — real block (
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| Metric | main | PR | Δ |
|---|---|---|---|
| Peak heap | 47814 MB | 46420 MB | -1394 MB (-2.9%) ⚪ |
| Prove time | 141.796s | 139.832s | -1.964s (-1.4%) ⚪ |
✅ No significant change.
Prove-time spread 0.9% (140.993s / 139.832s / 139.705s)
Commit: 8ba87f8 · Baseline: cached · Runner: self-hosted bench
diegokingston
marked this pull request as ready for review
July 31, 2026 21:24
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jotabulacios
approved these changes
Aug 4, 2026
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…iny-keccak patch
ethrex's free-fn keccak_hash path (trie/RLP/tx hashing) bypasses the Crypto trait, so ~6% of a 20-tx block ran tiny_keccak's pure-Rust keccakf in the guest despite the keccak chip. Vendor tiny-keccak 2.0.2 under crypto/tiny-keccak with a one-hunk patch: on riscv64, keccakf calls the keccak_permute ecall; host keeps the software impl. Activated via [patch.crates-io] in the ethrex guest workspace.
Measured vs origin/main (same fixtures, deterministic):
transfers_20 8,732,213 -> 8,461,843 (-270,370, -3.1%)
erc20_20 10,328,222 -> 9,929,487 (-398,735, -3.9%)
mixed_20 9,817,444 -> 9,450,857 (-366,587, -3.7%)
software tiny_keccak::keccakf in the guest flamegraph: 397k -> 0 (erc20_20).
Verified: test_prove_ethrex_empty_block (prove+verify) passes.