[Node Operator Question] Can we configure max gas limit or block gas in L2 (Testnet)

[priyanshuthapliyal55]

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Issue Description

I am deploying L2 rollups testnet on L1 sepolia. Now i want to know if i can configure max gas limit or block gas in L2 rollups. If yes then how or what parameter i can use for that.

Protocol Description

op-geth - Geth/v1.101311.1-rc.1-84b52dfd-20240423/linux-amd64/go1.21.6
op-node - version v0.0.0-a06cae81-1705510057
L1 chain - ETH Sepolia

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[sbvegan]

Yes you can configure the max gas limit, see Gas Limit in the Consensus Parameters table on the OP Stack Configurability specs. It looks like this parameter is managed by the SystemConfig, this proxy contract is deployed on the L1 and is picked up by L2 as part of the derivation of the L2 chain. This is generally set at genesis, I believe you can update it, but I'm pretty sure this requires a hard fork/network upgrade.

[priyanshuthapliyal55]

So I just need to update the confige json file which we use when deploying contracts?

[sbvegan]

Yes, I believe the parameter is l2GenesisBlockGasLimit and the value is a hex value. Example for 30_000_000 gas

"l2GenesisBlockGasLimit": "0x1c9c380",

[priyanshuthapliyal55]

So by default it is 30_000_000 and by any means is there any max limit that we can change this to ? Or we can change this to any value?

[sbvegan]

You can raise you gas limit to whatever your hardware can support. If the blocks are full and you have high limit, it can take a long time for the sequencer to build the block. It might exceed the normal ~2s block time