Set mainnet default gasLimit to 30M. Fixed #3767

[jmcpheron]

Update default gasLimit in preparation for The Merge™.

[jmcpheron]

This would close Issue #3767

[shemnon]

This doesn't actually change the default gas for mainnet. It changes a block value in the genesis block of Ethereum Mainnet, which changes the hash of the genesis block, which breaks validation from the very first block.

This value must be 5000 (0x1388 hex), as shown here - https://etherscan.io/block/0

[matkt]

This doesn't actually change the default gas for mainnet. It changes a block value in the genesis block of Ethereum Mainnet, which changes the hash of the genesis block, which breaks validation from the very first block.

This value must be 5000 (0x1388 hex), as shown here - https://etherscan.io/block/0

idk what do you think @shemnon but for me the gaslimit will increase automatically thanks to this https://github.com/hyperledger/besu/blob/ed1329cf848a9d7858d039a55add810da3c428b5/ethereum/core/src/main/java/org/hyperledger/besu/ethereum/mainnet/LondonTargetingGasLimitCalculator.java

[jmcpheron]

Thanks for the feedback. The documentation on the target-gas-limit CLI option states:

If a value for target-gas-limit is not specified, the block gas limit remains at the value specified in the genesis file.

Does that update in the LondonTargetingGasLimitCalculator change to default gasLimit to whatever the mainnet is voting for?

[garyschulte]

This doesn't actually change the default gas for mainnet. It changes a block value in the genesis block of Ethereum Mainnet, which changes the hash of the genesis block, which breaks validation from the very first block.
This value must be 5000 (0x1388 hex), as shown here - https://etherscan.io/block/0

idk what do you think @shemnon but for me the gaslimit will increase automatically thanks to this https://github.com/hyperledger/besu/blob/ed1329cf848a9d7858d039a55add810da3c428b5/ethereum/core/src/main/java/org/hyperledger/besu/ethereum/mainnet/LondonTargetingGasLimitCalculator.java

I need to check the interplay between this default and the targeting gas limit calculator for producing blocks, but I believe we currently have a hardcoded 30m gas limit for all post-merge blocks if it is otherwise unspecified:

https://github.com/hyperledger/besu/blob/main/consensus/merge/src/main/java/org/hyperledger/besu/consensus/merge/blockcreation/MergeCoordinator.java#L78-L81

[macfarla]

@garyschulte can we close this one since the gas limit is hardcoded?