Add EIP: RLP Execution Block Size Limit #9658

Giulio2002 · 2025-04-17T20:46:19Z

ATTENTION: ERC-RELATED PULL REQUESTS NOW OCCUR IN ETHEREUM/ERCS

--

When opening a pull request to submit a new EIP, please use the suggested template: https://github.com/ethereum/EIPs/blob/master/eip-template.md

We have a GitHub bot that automatically merges some PRs. It will merge yours immediately if certain criteria are met:

The PR edits only existing draft PRs.
The build passes.
Your GitHub username or email address is listed in the 'author' header of all affected PRs, inside .
If matching on email address, the email address is the one publicly listed on your GitHub profile.

eth-bot · 2025-04-17T20:46:41Z

✅ All reviewers have approved.

EIPS/eip-xxxx.md

github-actions · 2025-04-23T18:45:09Z

The commit 0d57c4e (as a parent of d8272e1) contains errors.
Please inspect the Run Summary for details.

EIPS/eip-7934.md

jochem-brouwer

Some comments, main one I think MiB and KiB should be used instead of MB and KB :) I also don't completely understand the 512 KiB margin, why is this added? If the block fits within the network limit it should be fine, right? Why this extra margin?

jochem-brouwer · 2025-04-24T21:23:45Z

EIPS/eip-7934.md

+---
+eip: 7934
+title: RLP Execution Block Size Limit
+description: Introduce a protocol-level cap on the maximum RLP-encoded block size to 10 MB, including a 512 KB margin for beacon block size.


I think the correct unit to be used in this document is KiB and MiB. A MegaByte is 1e6 bytes, and a MebiByte is 2^20 = 1,048,576 bytes. See https://simple.wikipedia.org/wiki/Mebibyte (KiB = 1024 bytes, KB = 1000 bytes)

jochem-brouwer · 2025-04-24T21:26:45Z

EIPS/eip-7934.md

+### Block Size Cap
+
+- Introduce constants:
+  - `MAX_BLOCK_SIZE` set to **10 MB (10,485,760 bytes)**


Suggested change

- `MAX_BLOCK_SIZE` set to **10 MB (10,485,760 bytes)**

- `MAX_BLOCK_SIZE` set to **10 MiB (10,485,760 bytes)**

jochem-brouwer · 2025-04-24T21:26:55Z

EIPS/eip-7934.md

+
+- Introduce constants:
+  - `MAX_BLOCK_SIZE` set to **10 MB (10,485,760 bytes)**
+  - `MARGIN` set to **512 KB (524,288 bytes)**


Suggested change

- `MARGIN` set to **512 KB (524,288 bytes)**

- `MARGIN` set to **512 KiB (524,288 bytes)**

jochem-brouwer · 2025-04-24T21:27:17Z

EIPS/eip-7934.md

+---
+eip: 7934
+title: RLP Execution Block Size Limit
+description: Introduce a protocol-level cap on the maximum RLP-encoded block size to 10 MB, including a 512 KB margin for beacon block size.


Suggested change

description: Introduce a protocol-level cap on the maximum RLP-encoded block size to 10 MB, including a 512 KB margin for beacon block size.

description: Introduce a protocol-level cap on the maximum RLP-encoded block size to 10 MiB, including a 512 KiB margin for beacon block size.

EIPS/eip-7934.md

jochem-brouwer · 2025-04-24T21:35:34Z

EIPS/eip-7934.md

+
+## Motivation
+
+Currently, Ethereum does not enforce a strict upper limit on the encoded size of blocks. This lack of constraint can result in:


I think we should carefully define what is a "block" here. Because for EL we could pick the block header, the block itself (header + block body (so this includes transactions and withdrawals for instance)). Or would it be some serialization of whatever gets sent over engine_newPayload (so some kind of RLP serialization of ExecutionPayloadV_n?)

EIPS/eip-7934.md

benaadams · 2025-04-25T01:14:39Z

If the block fits within the network limit it should be fine, right? Why this extra margin?

Is only EL block the EL can reason about not the EL block with CL wrapper

jochem-brouwer · 2025-04-25T03:56:17Z

Is only EL block the EL can reason about not the EL block with CL wrapper

Ah right, sorry, I'm a "pure EL" dev so I completely forgot that CL adds extra "fields" in order to propagate the block. Another novice question: can we prove that this safety margin (512 KiB) is sufficient enough? Or are there cases where we use all the reserved block space for the block, and the added CL fields will now grow the data packet over 10 MiB? Is there a worst case scenario where this is possible? (Is it possible to set a safe margin limit such that we can theoretically never go over the 10 MiB)

benaadams · 2025-04-25T12:06:48Z

Another novice question: can we prove that this safety margin (512 KiB) is sufficient enough?

It was quoted as worst case of 128KiB in Belatrix https://github.com/ethereum/consensus-specs/blob/dev/specs/bellatrix/p2p-interface.md#gossipsub

Considering that BeaconBlock max size is on the order of 128 KiB in the worst case

Don't know what it is now; hence going for 512KiB

Also is an EL devp2p limit of 10MiB (- framing) after which peer will be disconnected if they gossip it https://github.com/ethereum/devp2p/blob/master/caps/eth.md

The practical limits for the eth protocol are lower, typically 10 MiB. If a received message is larger than the limit, the peer should be disconnected.

EIPS/eip-7934.md

g11tech · 2025-04-25T14:55:00Z

lemme know when good for merging since there are a good amount of open technical comments

Co-authored-by: Jochem Brouwer <jochembrouwer96@gmail.com>

Giulio2002 · 2025-04-25T19:25:02Z

lemme know when good for merging since there are a good amount of open technical comments

I think good for merging

changeschung · 2025-04-25T20:32:07Z

Thank you for searching out It really matters to me

…

On Sat, Apr 26, 2025, 12:25 AM Giulio rebuffo ***@***.***> wrote: *Giulio2002* left a comment (ethereum/EIPs#9658) <#9658 (comment)> lemme know when good for merging since there are a good amount of open technical comments I think good for merging — Reply to this email directly, view it on GitHub <#9658 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BC6Y7BDGMUR3N2L44WNMMA323KD2NAVCNFSM6AAAAAB3LYWAE6VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDQMZRGI2TOMBXGU> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

dajuguan · 2025-04-26T03:50:13Z

I have a naive question: with the current gas limit, block sizes typically don't exceed 3 MiB. In what scenario would a block size reach 10 MiB?

benaadams · 2025-04-29T07:49:42Z

I have a naive question: with the current gas limit, block sizes typically don't exceed 3 MiB. In what scenario would a block size reach 10 MiB?

Around 100MGas block where the block was a single tx that was all zeros

Giulio2002 · 2025-05-05T11:47:24Z

@g11tech ready for merging. addressed everything

g11tech · 2025-05-06T12:37:21Z

EIPS/eip-7934.md

+  - `MAX_RLP_BLOCK_SIZE` calculated as `MAX_BLOCK_SIZE - MARGIN`
+- Any RLP-encoded block exceeding `MAX_RLP_BLOCK_SIZE` must be considered invalid.
+
+Thus add the following check to the Ethereum protocol:


should be good idea to list where all these checks should be enforced unless speced out somewhere else

g11tech

added a nit but still approving, see if you would want to address it in your followup PRs which shouldn't require editor's approval (if in draft)

eth-bot

All Reviewers Have Approved; Performing Automatic Merge...

noelportillo

Are they going for the new ones

Giulio2002 added 3 commits April 17, 2025 22:30

save

6674f8b

save

1cdea9d

save

1c73bf7

Giulio2002 requested a review from eth-bot as a code owner April 17, 2025 20:46

github-actions bot added c-new Creates a brand new proposal s-draft This EIP is a Draft t-core labels Apr 17, 2025

eth-bot added e-consensus Waiting on editor consensus e-review Waiting on editor to review labels Apr 17, 2025

eth-bot changed the title ~~Add limit to rlp(block)~~ Add EIP: RLP Block Size Limit Apr 17, 2025

github-actions bot added the w-ci Waiting on CI to pass label Apr 17, 2025

Giulio2002 added 5 commits April 17, 2025 22:52

save

28f63b4

save

286115f

save

ad7c99e

save

6400909

save

1f95549

eth-bot changed the title ~~Add EIP: RLP Block Size Limit~~ Add EIP: RLP Execution Block Size Limit Apr 17, 2025

Giulio2002 added 2 commits April 17, 2025 23:31

save

0f69911

save

46eee69

lightclient reviewed Apr 18, 2025

View reviewed changes

EIPS/eip-xxxx.md Outdated Show resolved Hide resolved

save

0d57c4e

Giulio2002 added 2 commits April 23, 2025 20:47

save

fe3719b

save

31b32f8

github-actions bot removed the w-ci Waiting on CI to pass label Apr 23, 2025

benaadams approved these changes Apr 23, 2025

View reviewed changes

g11tech reviewed Apr 23, 2025

View reviewed changes

EIPS/eip-7934.md Outdated Show resolved Hide resolved

benaadams mentioned this pull request Apr 23, 2025

All Core Devs - Execution (ACDE) #210, April 24 ethereum/pm#1462

Closed

save

970cf7d

timbeiko mentioned this pull request Apr 24, 2025

All Core Devs - Execution (ACDE) #211, May 8 ethereum/pm#1500

Closed

jochem-brouwer reviewed Apr 24, 2025

View reviewed changes

benaadams reviewed Apr 25, 2025

View reviewed changes

EIPS/eip-7934.md Outdated Show resolved Hide resolved

Update EIPS/eip-7934.md

4fa82bc

Co-authored-by: Jochem Brouwer <jochembrouwer96@gmail.com>

Giulio2002 added 2 commits May 5, 2025 13:46

save

45bcccd

save

fc34dc8

g11tech reviewed May 6, 2025

View reviewed changes

g11tech approved these changes May 6, 2025

View reviewed changes

eth-bot enabled auto-merge (squash) May 6, 2025 12:39

eth-bot approved these changes May 6, 2025

View reviewed changes

eth-bot merged commit 040800a into ethereum:master May 6, 2025
11 checks passed

noelportillo reviewed Jul 22, 2025

View reviewed changes

	- `MAX_BLOCK_SIZE` set to 10 MB (10,485,760 bytes)
	- `MAX_BLOCK_SIZE` set to 10 MiB (10,485,760 bytes)

	- `MARGIN` set to 512 KB (524,288 bytes)
	- `MARGIN` set to 512 KiB (524,288 bytes)

	description: Introduce a protocol-level cap on the maximum RLP-encoded block size to 10 MB, including a 512 KB margin for beacon block size.
	description: Introduce a protocol-level cap on the maximum RLP-encoded block size to 10 MiB, including a 512 KiB margin for beacon block size.


		## Motivation

		Currently, Ethereum does not enforce a strict upper limit on the encoded size of blocks. This lack of constraint can result in:

Add EIP: RLP Execution Block Size Limit #9658

Add EIP: RLP Execution Block Size Limit #9658

Uh oh!

Conversation

Giulio2002 commented Apr 17, 2025

Uh oh!

eth-bot commented Apr 17, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

Uh oh!

github-actions bot commented Apr 23, 2025

Uh oh!

Uh oh!

jochem-brouwer left a comment

Choose a reason for hiding this comment

Uh oh!

jochem-brouwer Apr 24, 2025

Choose a reason for hiding this comment

Uh oh!

jochem-brouwer Apr 24, 2025

Choose a reason for hiding this comment

Uh oh!

jochem-brouwer Apr 24, 2025

Choose a reason for hiding this comment

Uh oh!

jochem-brouwer Apr 24, 2025

Choose a reason for hiding this comment

Uh oh!

Uh oh!

jochem-brouwer Apr 24, 2025

Choose a reason for hiding this comment

Uh oh!

Uh oh!

Uh oh!

Uh oh!

Uh oh!

benaadams commented Apr 25, 2025

Uh oh!

jochem-brouwer commented Apr 25, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

benaadams commented Apr 25, 2025

Uh oh!

Uh oh!

g11tech commented Apr 25, 2025

Uh oh!

Giulio2002 commented Apr 25, 2025

Uh oh!

changeschung commented Apr 25, 2025 via email

Uh oh!

dajuguan commented Apr 26, 2025

Uh oh!

benaadams commented Apr 29, 2025

Uh oh!

Giulio2002 commented May 5, 2025

Uh oh!

g11tech May 6, 2025

Choose a reason for hiding this comment

Uh oh!

g11tech left a comment

Choose a reason for hiding this comment

Uh oh!

eth-bot left a comment

Choose a reason for hiding this comment

Uh oh!

Uh oh!

noelportillo left a comment

Choose a reason for hiding this comment

Uh oh!

Uh oh!

eth-bot commented Apr 17, 2025 •

edited

Loading

jochem-brouwer commented Apr 25, 2025 •

edited

Loading