Intel with all the melt/spec/leak mitigations, the bare-bones syscall cost went from ~70ns to about ~350ns. It's crazy. I think we lost 10 years of system call performance.
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I do understand that shared-memory-based protocols are generally more efficient, but isn't that just as true now as it used to be? (Or maybe even less now, because of Amdahl's law)
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heck, classic pipe-based communication copies the memory *twice*. if you have a shared memory channel and don't trust the writer, you can just let the reader copy the data over into a second buffer and parse it from there, and you *still* have one less memory copy than before
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