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SubjectRe: [2.6.0-test3] Hyperthreading gone
On Sun, Aug 10, 2003 at 09:03:42AM +0200, Florian Weimer wrote:
> I didn't. Previous experience (with some 2.5.x versions) indicates
> that Linux does not support full ACPI on this machine. The
> documentation suggests that the command line option enables full ACPI,
> so I hesitate to do this.

According to the 2.6.0-test3 menuconfig help text, the parameter is
required when CPU Enumeration Only is selected, and enables only
limited ACPI support. For whatever it's worth, that matches my


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 (CONFIG_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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