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Date: Thu, 27 Jun 2013 20:51:06 +0200
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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Subject: Re: [Xenomai] High latency and smi with intel vendor chip
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To: Franz Engel <franz_lambert_engel@yahoo.de>
Cc: 'Jan Kiszka' <jan.kiszka@siemens.com>, xenomai@xenomai.org

On 06/27/2013 07:26 PM, Franz Engel wrote:

> I cleared the bits (18, 17, 14, 13, 11, 6 and 3), rather, they were already
> cleared. The value of the register was 23.


Hi,

You may try to clear all bits except bits 0 and 1. Though, please run
tests, and check for overheating, in case one disabled SMI source is in
fact the fan control.


> But I have still latencies
> between 4us and 90us. Is there a best practice to find out what is the
> reason for this latencies?


First, please tell us which version of Linux you use, with which version
of the I-pipe patch. Then post your kernel configuration. For instance
if you have ACPI and/or USB disabled, you should enable them.

Regards.

-- 
                                                                Gilles.