Re: SMT, again (was: Re: [PATCH]: Fix MTRR handling on HT CPUs)

From: Alan Cox (alan@lxorguk.ukuu.org.uk)
Date: Wed Feb 13 2002 - 07:15:52 EST


> I just found out that Intel specifies that on SMT-enabled
> ("Jackson") systems the BIOS MP tables list only the physical CPUs.
> Logical CPUs will only be available through the ACPI tables.

Yep. Thats why the miniacpi scanning stuff is in the current kernel

> All my attempts to get ACPI running on our SMT-enabled system have failed
> so far (I'm working on a bug report on that for linux-acpi).

You don't need ACPI itself. See arch/i386/kernel/acpitable.c. Intel contributed
patches to handle this stuff already.

Alan
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