MiniPc & Debian Stretch RT

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11 Mar 2019 21:03 #128381 by vmihalca
Hi guys,

I bought a mini pc for my mill. Its a china made XCY fanless pc i7, 4gb ram, 60gb ssd
The jitter is about 190000 ns for servo thread and 175000 ns for base thread.
I am using a Mesa 7i76e, considering that mesa will generate the pulses, what do you think about this latency?

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11 Mar 2019 22:26 #128389 by PCW
Replied by PCW on topic MiniPc & Debian Stretch RT
Thats fairly bad but likely could be improved

First I would try a servo thread only test since you may be saturating the RT capabilities of your system with the default 40 KHz base thread:

latency-test 1ms 1ms
or
latency-histogram --nobase --sbinsize 500

Also I would make sure that all power saving options are disabled in the BIOS

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11 Mar 2019 22:27 #128390 by Leon82
Replied by Leon82 on topic MiniPc & Debian Stretch RT
I emailed them general questions about it And they said since it's hardware step generation the latency is relaxed and can tolerate 300 usec latency.

The real time kernal is still required

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12 Mar 2019 11:59 #128423 by pl7i92
Replied by pl7i92 on topic MiniPc & Debian Stretch RT
did you try to get more infos about the Board and Bios settings to reduce belo2 100us

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