Earlier quoted context omitted.
I think netflix use BSD because they wanted to use BSD. Sure some flavours of BSD have ZFS built in, but thats a pretty rare corner case. Linux has two things that are extremely useful compared to BSD: 1) commercial backing (should one choose it) 2) first class support for inifinband, top end ethernet (should they use it) and storage controllers
Netflix uses BSD for OpenConnect because asynchronous disk I/O-which is critical for a CDN-remains a tire fire on Linux after more than 20 years. On Linux you basically have to use blocking threads to emulate async disk I/O, which means tons of threads and overhead when you’re handling 10k-100k concurrent connections per box.
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