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With Ubuntu looking at applying their low-latency optimizations to their generic kernel builds in order to eliminate maintaining their existing 'lowlatency' kernel option, I decided to run some fresh benchmarks looking at the performance impact of their low-latency kernel against their 'generic' default kernel used on Ubuntu Linux systems.

With Linux going to disable PCID support on Intel Alder Lake and Raptor Lake while waiting for mitigated microcode due to a CPU bug, I was curious if this disabling of Process Context Identiifiers would have any overall performance implications