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Date: Wed, 13 Mar 2013 22:40:27 +0100
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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Subject: Re: [Xenomai] SMI handling on x86
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To: Jeroen Van den Keybus <jeroen.vandenkeybus@gmail.com>
Cc: xenomai@xenomai.org

On 03/13/2013 08:43 PM, Jeroen Van den Keybus wrote:

> Hi,


Hi,

>=20
>=20
> We have configured Linux 3.5.7 / Xenomai 2.6.2.1 on an MSI-7514 mainboa=
rd
> with a Core 2 Duo CPU.
>=20
> This configuration suffers from excessive worst-case latencies during t=
he
> 'latency' test (on average: 2.6 =C2=B5s, worst-case around 1900 =C2=B5s=
, around 10
> overruns per second). I believe these overruns are due to the CPUs ente=
ring
> SM mode (SMI). As soon as the ACPI BIOS SMI


Do you have ACPI enabled in the kernel configuration?

--=20
                                                                Gilles.