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General informations

The Linux kernel configuration item CONFIG_ACPI_HT_ONLY:

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This option enables limited ACPI support -- just enough to enumerate processors from the ACPI Multiple APIC Description Table (MADT). Note that ACPI supports both logical (e.g. Hyper- Threading) and physical processors, where the MultiProcessor Specification (MPS) table only supports physical processors.

Full ACPI support (ACPI) is preferred. Use this option only if you wish to limit ACPI's role to processor enumeration.

In this configuration, ACPI defaults to off. It must be enabled on the command-line with the "acpismp=force" option.



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