Raphaël,
[..]
root@USBnux:/home/xaf/RT/rt-tests# ./hwlatdetect --threshold=1 --report=/home/xaf/hwlat_report
hwlatdetect: test duration 120 seconds
parameters:
Latency threshold: 1us
Sample window: 1000000us
Sample width: 500000us
Non-sampling period: 500000us
Output File: /home/xaf/hwlat_report
Starting test
test finished
Max Latency: 38136us
Samples recorded: 45
Samples exceeding threshold: 45
sample data written to /home/xaf/hwlat_report
and the content of the hwlat_report file :
1319575592.0802426354 19061
1319575707.0402420761 19036
[..]
I really have no idea from where the problem could be. And I need your
lights to help me.
The hwlatdetect application detects system management interrupts (SMIs).
Such interrupts are installed by the BIOS and are used to manage various
things such as battery management, overheat protection and emulation of
legacy devices (e.g. IDE, PS/2 etc.). You may try to check your BIOS
settings and disable all these or similar features. Then run hwlatdetect
again. If it still reports SMIs, the next thing to do depends on the
promises that you got when you bought the board:
1. It was advertised as an industrial PC to be used in a control systems
and to run a real-time operating system:
Return the board to the manufacturer along with the printed output of
hwlatdetect and ask for a fix or your money back.
2. It is a standard server PC board without any promises as to its
suitability in a real-time system:
There probably is nothing you can do. Try to send the output of
hwlatdetect to the BIOS manufacturer and nicely ask for a fixed BIOS,
but I am not very optimistic that you will get one.
Hope this helps,
-Carsten.
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