From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Tue, 28 Sep 2010 13:09:52 +0200
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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Subject: Re: [Xenomai-help] switchtest/xeon-test fails: Help needed
 (Ubuntu/Core i7)
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To: Gajamohan Mohanarajah <gajamohan.m@domain.hid>
Cc: xenomai@xenomai.org, Jan Kiszka <jan.kiszka@domain.hid>

Gajamohan Mohanarajah wrote:
> Hi Gilles,
> 
> Here is the full test result.
> 
> acpi=off -> works
> acpi=hf -> negative (Disables all of ACPI except just enough to enable
> Hyper Threading)
> pci=noacpi -> negative (Disables ACPI for IRQ routing and PCI scanning)
> acpi=noirq -> negative (Disables ACPI for IRQ routing)
> pnpacpi=off -> negative (Disables the ACPI component of the Linux Plug
> and Play code)
> noapic -> negative (Disables the IO-APIC for IRQ routing or PCI scanning)
> nolapic -> ***works*** (Disables the local APIC)
> 
> This PC is to control a kuka-lwr arm, with a Orocos/Xenomai setup and
> using the Kuka FRI (Fast Research Interface, UDP /1~10 ms sampling
> times). What do you think of going ahead with acpi=off. I would like
> to hear your comments.

I think if Linux alone works with ACPI on and Linux + I-pipe does not,
then there is a problem somewhere. We already saw in the past cases
where disabling ACPI resulted in IRQ being routed incorrectly,
indpendently of the I-pipe patch, (the kind of issue you seem to have).
So, setting ACPI to off may result in such issues.

The other issue, is that with acpi=off you get 4 cpus detected instead
of 8, so you are not using the hardware you have completely.

But of course, the choice is yours.

-- 
                                                                Gilles.