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Since it's CPU-bound and spends a lot of time in the kernel would compiling the kernel for the specific CPU used make sense? Or are the CPU cycles wasted on things the compiler can't optimize?

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Recompiling the kernel using profile guided optimizations[1] is yet another thing on the (never-ending) to-do list.

1. https://lwn.net/Articles/830300/

Could you make a profile of just a bunch of functions on a running system?

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