linux-kernel - Re: [BUG? -rc7] SMP: Just one CPU activated: P4 3GHz HT

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Date:	Mon, 23 Apr 2007 10:11:52 +0200
From:	"Miguel Ojeda" <maxextreme@...il.com>
To:	"Luca Tettamanti" <kronos.it@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	"oliver pinter" <oliver.pntr@...il.com>,
	"Robert Hancock" <hancockr@...w.ca>
Subject: Re: [BUG? -rc7] SMP: Just one CPU activated: P4 3GHz HT

On 4/22/07, Luca Tettamanti <kronos.it@...il.com> wrote:
> Probably the two siblings are enumerated only in ACPI tables. If you
> disable ACPI the kernel won't be aware of the second "core".
>
> Luca
> --
> "Su cio` di cui non si puo` parlare e` bene tacere".
>  Ludwig Wittgenstein
>

On 4/23/07, Robert Hancock <hancockr@...w.ca> wrote:
>
> You didn't enable ACPI, it's needed for almost all systems to detect HT
> and also for many systems to detect multi-cores as well.
>
> Aside from that, in general I would say that on any modern x86 system
> ACPI should always be enabled. In many cases it seems the BIOS code is
> not tested much without ACPI anymore, so going without ACPI can be
> problematic.
>
> --
> Robert Hancock      Saskatoon, SK, Canada
> To email, remove "nospam" from hancockr@...pamshaw.ca
> Home Page: http://www.roberthancock.com/
>
>

Thanks all of you. It seems the problem is ACPI, however, should not
it be noted in some way? Maybe at Documentation/smp.txt, maybe at the
help section at CONFIG_SMP, maybe a "depends on ..."

Or maybe CONFIG_SMP should enable some bits of the ACPI code needed to
detect such additional cores.

-- 
Miguel Ojeda
http://maxextreme.googlepages.com/index.htm
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