Polkassembly Logo

Head 1
Head 2
Head 3
Head 4
Create Pencil IconCreate
TRACKS
ORIGINS
Report an issueNeed help with something?
Foot 1
Foot 2
Foot 3
Foot 4
OpenGov
View All Root
Executed

Fix HostConfiguration

inRoot
730 days ago

(Same as on Kusama https://kusama.polkassembly.io/referenda/173)

Fix HostConfiguration (maxCodeSize to 3 MiB)

The current Polkadot HostConfiguration does not fulfill all assumptions about its consistency. This proposal aims at correcting that by modifying the on-chain config.

Problem

The HostConfiguration::consistency_check function asserts that the on-chain max_code_size is never larger than MAX_CODE_SIZE. This is violated on Polkadot since the concrete max_code_size on-chain is 10 MiB and MAX_CODE_SIZE is only 3 MiB.
You can verify this by querying PolkadotJS:

let config = await api.query.configuration.activeConfig();
console.log(config.maxCodeSize / (1024*1024), "MiB");
// Prints 10 MiB

It is neccecary to correct this since otherwise the consistency_check will stay a No-OP with the assumption: "You cannot break something that is already broken".

Proposal

Set the on-chain max_code_size back to a sane value of 3 MiB. A larger value is not expected to work due to networking restrictions. Related discussions about this are in polkadot/#7108 and polkadot/#7105.

Impact on Para*s

Parachain/Parathread teams should check that all queued runtime upgrade have a size of at most 3 MiB (the Runtime Size as reported by srtool). A sweep across all parachains showed that the largest is currently 1.7 MiB, that is about 57% of the new limit. So no problem here.

Impact on Developers

-

Comments (1)

profile
Sandritis2
730 days ago

Vote

PleaseLogin to comment

Proposal Passed

3

of 3

Summary

0%

Aye

AyeNay

0%

Nay

Aye (157)0.0 DOT

Support0.0 DOT

Nay (6)0.0 DOT

Voting Data

Approval%

Support%

Threshold0.00%

Threshold0.00%

Help Center

Report an Issue
Feedback
Terms and Conditions
Github

Our Services

Docs
Terms of Website
Privacy Policy

A House of Commons Initiative.

Polka Labs Private Limited 2025

All rights reserved.

Terms and ConditionsTerms of Website
Privacy Policy