From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Fri, 02 Oct 2009 16:14:01 +0200
From: Roman Pisl <rpisl@domain.hid>
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Subject: Re: [Xenomai-help] Freeze on SMP x86-64
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To: Philippe Gerum <rpm@xenomai.org>
Cc: xenomai@xenomai.org

On 2.10.2009 15:40, Philippe Gerum wrote:
> On Fri, 2009-10-02 at 13:48 +0200, Roman Pisl wrote:
>> Hello,
>> I just tried x86-64 SMP Linux/Xenomai on my workstation (Intel Core2
>> Quad) but it freezes immediately after latency test or clocktest is
>> started. It freezes even during the boot, when Xenomai debbuging is
>> enabled.
>>
>> The same kernel binary runs seamlessly in KVM on the same machine.
>>
>> When I completely disable ACPI, the kernel recognizes only one CPU and
>> the latency test works.
>>
>> The same configuration but for 32bit x86 also runs without freeze.
>>
>> Do you have any ideas?
>>
>
> Try disabling PM_TIMER.
>

Do you mean CONFIG_X86_PM_TIMER? PM/ACPI probably requires this and as I 
described before - without ACPI Linux brings up only one CPU, the 
latency test works and doesn't freeze the machine.