# EIP2666 (global precompiles repricing and many more) discussion thread

This is a discussion thread for EIP-2666.

Necessary benchmarks for EIP 2666 were provided by the clients and raw form is assembled in here

Besu benchmarks

Short summary:

• BNADD
Gas
Geth 350
OE 225
Besu 165
Nethermind 120

BNADD cost will need to be adjusted when EIP 2046 is accepted

• BNMUL
Gas
Geth 3000
OE 6250
Besu 19109
Nethermind 5250

Besu result is surprising (I was told that some Rust lib is used, and addition looks fast, but multiplication is very slow). Only little repricing will be necessary when EIP 2046 is accepted

• SHA256 precompile

Currently it’s 60 gas + 12 gas per 32 byte word. Proposed formula is `A * ((len(input) + 8) / 64 + 1) + B`, with coefficients below

A B
Geth 5 3
OE 9 4
Besu 5 10
Nethermind 10 5

EIP 2666 proposes A = 9, B = 5. Besu implementation is Java built-in, so I doubt it can be improved, so it would be better to set A = 9, B = 10 that largely fits everyone. There are no large one-off costs in this precompile, so it’s EIP 2046 - safe.

• RIPEMD precompile

Currently it’s 600 gas + 120 gas per 32 byte word. Proposed formula is `A * ((len(input) + 8) / 64 + 1) + B`, with coefficients below

A B
Geth 12 6
OE 8 2
Besu 29 16
Nethermind 10 6

EIP 2666 proposes A = 12, B = 6. There are no large one-off costs in this precompile, so it’s EIP 2046 - safe. Besu expects to have performance improvements by the end of the year

• Keccak256 performance

Currently it’s 30 gas + 6 gas per 32 byte word. Proposed formula is `A * (len(input) / 136 + 1) + B`, with coefficients below

A B
Geth 13 13
OE 15 2
Besu 19 28
Nethermind 16 3

EIP 2666 proposes A = 15, B = 13. There are no large one-off costs in this precompile, so it’s EIP 2046 - safe. Besu expects to have performance improvements by the end of the year