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Feel free to illuminate us with what the possible performance discrepancy is instead caused by ?

Could be phrased better, but they're not wrong: https://news.ycombinator.com/item?id=17518518

A kernel bug, that systemd exposes by attempting to utilize more of the kernel's newer features.

Possibly, but it might simply be that systemd using the shiniest new features just for the sake of it is not the most performant or sensible approach.

When running Percona under systemd the EPYC system was getting 24% _more_ throughput.

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