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> Firecracker didn't have a very compelling I/O story

Can you provide any sources for this claim? We're running Firecracker in production over at blacksmith dot sh and haven't been able to reproduce any perf regressions in Firecracker over CH in our internal benchmarking.

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The major tradeoff with firecracker is a reduction in runtime performance for a quick boot time (if you actually need that - this obviously doesn't work if your app takes seconds to boot). There are quite a lot of other tradeoffs too like 'no gpu' because that needs some of the support that they remove to make things boot fast. That's why projects like 'cloud hypervisor' exist.

https://github.com/firecracker-microvm/firecracker/issues/16...

That issue is from 2020 and has already been addressed. The fact that io_uring support is not "GA" is mostly a semantic aspect that doesn't affect most use-cases.

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