Cannot produce blocks on time after switching to async backing

[AurevoirXavier]

Origin post: https://substrate.stackexchange.com/questions/11530/cannot-produce-blocks-on-time-after-switching-to-async-backing

[alexggh]

Could you give us a bit more details about your setup and logs

1. What polkadot version are you running ?
2. Which relaychain have you tested this against ?
3. What are you seeing on your collators
4. At what rate did your parachain produce blocks before upgrade and after the upgrade.

[AurevoirXavier]

1. polkadot-v1.1.0
2. Rococo
3. The log looks pretty normal, but it seals the same block multiple times, likely due to different collators racing. I can post more logs later.
4. It used to be 12s; now it's 18s. I have 3 collators, and I think the increase to 18s is because of two missing slots under the 6s block time.

[alexggh]

polkadot-v1.1.0 is this a typo ?

[AurevoirXavier]

polkadot-v1.1.0 is this a typo ?

Sorry, https://github.com/paritytech/polkadot-sdk/tree/release-polkadot-v1.1.0.

[alexggh]

polkadot-v1.1.0 predates full async-backing support, unfortunately there were a lot of fixes since then for async backing I would recommend upgrading to something newer.

[AurevoirXavier]

polkadot-v1.1.0 predates full async-backing support, unfortunately there were a lot of fixes since then for async backing I would recommend upgrading to something newer.

Which version do you recommend? We don't want to use the latest one.

[AurevoirXavier]

We decided to use async backing because of

[alexggh]

polkadot-v1.1.0 https://github.com/paritytech/polkadot-sdk/tree/release-polkadot-v1.1.0 was created on Sep 6, 2023, so it is really old.

Which version do you recommend? We don't want to use the latest one.

I would recommend you use the latest one, however if you have a specific reason not to use that one, you can go as back as polkadot-v1.8 bare in mind that we are already on polkadot-v1.12.

[AurevoirXavier]

Since we rely heavily on Moonbeam, they are currently using version polkadot-v1.7.2. I'll give it a try, since Moonbeam work with async backing well.

Thanks for your help. This issue might be invalid with the latest code, so let's close it for now.