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They have a job ad out [1] saying

"Facebook is seeking a Linux Kernel Software Engineer to join our Kernel team, with a primary focus on the networking subsystem. Our goal over the next few years is for the Linux kernel network stack to rival or exceed that of FreeBSD."

[1] https://www.facebook.com/careers/department?req=a0IA000000Cz...

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That's very interesting, but isn't very convincing. Is there some kind of study on the supposed differences? I like BSD, but I've always felt from admin experience that the Linux networking stack is far more capable in terms of features.

BSD is the implementation to the networking stack.

From the API design / pedigree side, sure. But that's a given, and a tangent to the curiosity I am trying to have sated :)

Well obviously it is a brief statement. Linux generally does have enormous numbers of features, but they are no use if they do not apply to you. My guesses about Facebook is that network stack issues would be around ipv6, performance or large scale (eg lost of routes).

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