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fix: only enable quinn-udp fast-apple-datapath on arm #2427

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mxinden
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@mxinden mxinden commented Feb 7, 2025

Only enable fast-apple-datapath on aarch64.

Old MacOS versions (e.g. 10.15) don't fully support sendmsg_x and recvmsg_x, both enabled by fast-apple-datapath. Instead of feature gating by OS version, simply do so by CPU arch, leveraging the fact that newer MacOS devices use ARM.


Draft for now. Debugging mozilla-central failure on MacOS 10.15.

@mxinden mxinden force-pushed the fast-apple-datapath-arm branch from 4f94edf to 3b8f248 Compare February 7, 2025 16:00
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github-actions bot commented Feb 7, 2025

Failed Interop Tests

None ❓

All results

Succeeded Interop Tests

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Unsupported Interop Tests

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@larseggert
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This is odd, because IIRC these syscalls predate Catalina by years.

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mxinden commented Feb 9, 2025

Thanks @larseggert for the info.

All suspicions for now. I just know it is related to Neqo v0.12 and MacOS 10.15.

Might as well be a syscall from the mtu crate which we are introducing through Neqo v0.12 as well.

(Thus far I have no other way to reproduce than Mozilla's CI, a single run take ~6h, and logs have not been helpful.)

I will continue to debug this.

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