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Implying that systemd is somehow the root-cause for this performance disparity strikes me as ridiculous.

I've noticed a pattern over the years with anyone spelling systemd as SystemD: They tend to not really know what the hell they're talking about with regards to systemd, while possessing significant bias against the project, actively searching for reasons to disparage it.

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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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