Date: Sun, 10 Aug 2003 07:00:32 -0500
From: Greg Norris <haphazard@kc.rr.com>
To: linux-kernel@vger.kernel.org
Subject: Re: [2.6.0-test3] Hyperthreading gone
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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
experience.


   CONFIG_ACPI_HT_ONLY:

   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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