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# Fix `HostConfiguration` (`maxCodeSize` to 3 MiB)

The current Kusama `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`](https://github.com/paritytech/polkadot/blob/v0.9.41/runtime/parachains/src/configuration.rs#L376) is never larger than `MAX_CODE_SIZE`. This is violated on Kusama since the concrete `max_code_size` on-chain is 10 MiB and `MAX_CODE_SIZE` is only [3 MiB](https://github.com/paritytech/polkadot/blob/v0.9.41/primitives/src/v2/mod.rs#L331).  
 You can verify this by querying [PolkadotJS](https://polkadot.js.org/apps/#/js):
 
```js
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](https://github.com/paritytech/polkadot/blob/v0.9.41/runtime/parachains/src/configuration.rs#L1324): "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](https://github.com/paritytech/polkadot/issues/7108) and [polkadot/#7105](https://github.com/paritytech/polkadot/issues/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](https://github.com/paritytech/polkadot/issues/7108#issuecomment-1516220831) showed that the largest is currently 1.7 MiB, that is about 57% of the new limit. So no problem here.

## Impact on Developers

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root

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Origin for signaling that the network wishes for some change

Able to spend up to 333,333.3333 KSM from the treasury at once

Managing the composition of the fellowship

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Able to spend up to 333.3333 KSM from the treasury at once

Able to spend up to 3,333.3333 KSM from the treasury at once

Able to spend up to 33,333.3333 KSM from the treasury at once

[Root] Referendum #173