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If you are referring to "Advances in Networking, part 1" [0], the material used is a little thin to draw any conclusion regarding their user-space TCP/IP design.

[0] https://devstreaming-cdn.apple.com/videos/wwdc/2017/707h2gkb...

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That is the talk I was referring to -- and I do agree the material is thin. But here's what I was basing it off of: the userspace networking slide has the "TCP / IPv6" block in userspace. While it's true this could be a broad block (it doesn't include UDP for example, which we know is in there), I doubt they would have explicitly put TCP if it was not true.

> I doubt they would have explicitly put TCP if it was not true

I am not doubting they have some sort of user-space TCP implementation. I am trying to understand how much of TCP they moved out of the kernel. From what I can gather they still have enough of it in the kernel such that the related syscall/uIPC overhead does not allow more than the 30% performance improvement announced.

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