Reporting back in case anyone looks at this: I think this option does nothing on my system (ASUS TUF Gaming X570-PRO motherboard, latest BIOS version 4021). The

Reporting back in case anyone looks at this: I think this option does nothing on my system (ASUS TUF Gaming X570-PRO motherboard, latest BIOS version 4021). The "ACPI SRAT L3 Cache as NUMA Domain" also does nothing. Somewhere I read these options are for 2-socket machines only (even though in concept they'd make NUMA meaningful on 1-socket machines). I'd be interested if anyone finds otherwise. I also tried passing "numa=fake=32G" or "numa=fake=2" to Linux. That syntax seems to match the documentation [1] but produced an error "Malformed early option 'numa'". Haven't dug into why. I'm not sure it'd correctly partition the cores anyway. I gave up for the moment. [1] https://www.kernel.org/doc/html/latest/x86/x86_64/boot-options.html https://www.kernel.org/doc/html/latest/x86/x86_64/boot-optio...