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Date: Tue, 06 Dec 2011 19:12:10 +0100
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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Subject: Re: [Xenomai-help] Xenomai installation: high latencies
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To: Kurt Geebelen <kurt.geebelen@domain.hid>
Cc: xenomai@xenomai.org

On 12/02/2011 04:28 PM, Kurt Geebelen wrote:
> Dear all,
>=20
> I've tried installing Xenomai, following these instructions:
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> http://www.xenomai.org/index.php/Building_Debian_packages
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> but then for the latest version (xenomai 2.6.0, and kernel 2.6.38.8 and=
=20
> for 64 bit) .
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> For configuring the kernel, I followed these instructions:
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> http://www.xenomai.org/index.php/Configuring_x86_kernels
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> All that is stated on these websites works without problems, and I am=20
> able to boot in the installed xenomai kernel. However, when I perform=20
> the latency-test (latency in /usr/lib/xenomai), I get latencies of more=
=20
> than 1400 microseconds.
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> The system I have is the following:
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> Dell=E2=84=A2 Precision=E2=84=A2 T1500
> One=C2=AE Intel=E2=84=A2 Core i7-860 (2.8GHz, 8MB L3, 95W, Quad Core)
> 6GB DDR3 non-ECC Memory (1333MHz, 3x2GB)
> 512MB PCIe x16 NVIDIA Quadro FX 580 Graphics Card
> Intel Solid-State Drive 320 Series 120GB
>=20
> I have tried reinstalling the kernel several times, but I always end up=
=20
> with high latencies.
> I also have consulted with others, who followed the same guidelines as =
I=20
> did, and their latencies are about 100 times lower.
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> Is there somebody who knows what the problem might be? Might it be a=20
> hardware-related problem?

It is already written in the URL you mention, but I will repeat it
nevertheless, if enabling SMI workaround, have you checked the kernel
logs to see whether the SMI workaround actually works?

--=20
					    Gilles.