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To: Frank van Maarseveen <frankvm@frankvm.com>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org
Subject: Re: 2.6.13-rc4: no hyperthreading and idr_remove() stack traces
References: <20050729162006.GA18866@janus>
	<20050729170319.23f24a01.akpm@osdl.org>
From: ebiederm@xmission.com (Eric W. Biederman)
Date: Fri, 29 Jul 2005 18:22:47 -0600
In-Reply-To: <20050729170319.23f24a01.akpm@osdl.org> (Andrew Morton's
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Andrew Morton <akpm@osdl.org> writes:

> Frank van Maarseveen <frankvm@frankvm.com> wrote:
>>
>> 2.6.13-rc4 does not recognize the second CPU of a 3GHz HT P4:
>
> OK, we seem to have broken your APIC code.

There is a big difference here in that one kernel is using
the ACPI MADT tables and the other kernel is using the MP table.

I suspect the MP table on your system is incomplete while 
your ACPI MADT does specify both logical cpus. 

Eric