Both fast CPU & step generation desktop

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15 Jun 2016 15:27 #76094 by PCW
Also for Preempt-RT you might want a more up-to-date kernel (3.18 is pretty ancient)
They are easy to build
The following user(s) said Thank You: tarasko

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15 Jun 2016 19:31 #76120 by tarasko

Also for Preempt-RT you might want a more up-to-date kernel (3.18 is pretty ancient)
They are easy to build


Thanks for advise! I compiled Linux Kernel 4.6.2 with rt patch. Results are better, got max Base thread 36000-40000ns. I think with these timings I can execute linuxcnc and calculate toolpathes on one machine.

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16 Jun 2016 08:38 - 16 Jun 2016 08:57 #76137 by tarasko

Also for Preempt-RT you might want a more up-to-date kernel (3.18 is pretty ancient)
They are easy to build


Is it possible to compile linux kernel with RTAI for x86_64 platform? I think kernel with RTAI patches will be much more time responsive than Preempt-RT.
Last edit: 16 Jun 2016 08:57 by tarasko.

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16 Jun 2016 14:22 #76174 by andypugh

Is it possible to compile linux kernel with RTAI for x86_64 platform?


It seems to be: www.rtai.org/

Have fun :-) Be prepared to be trying just one more compiler switch at 2am.

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16 Jun 2016 19:18 #76183 by tarasko

Is it possible to compile linux kernel with RTAI for x86_64 platform?


It seems to be: www.rtai.org/

Have fun :-) Be prepared to be trying just one more compiler switch at 2am.


Strange. I compiled kernel 4.1.18 with rtai-5.0-test2 patches and I'm getting really high latencies 17000000ns. Something wrong.

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16 Jun 2016 19:32 #76184 by andypugh

Strange. I compiled kernel 4.1.18 with rtai-5.0-test2 patches and I'm getting really high latencies 17000000ns. Something wrong.


Seems too obvious to mention, but are you actually running the new kernel?

There are a number of kernel config options to set to get RTAI to work as well as the patches. Did you do that?

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16 Jul 2016 13:29 - 16 Jul 2016 13:29 #77543 by tarasko
Unfortunately I didn't managed to tune kernel with RTAI patches to achieve minimum latency. The results was horrible. So I sticket to preempt rt kernel images which I've found at linuxcnc.org.
So my max BASE_PERIOD is 43050ns, not so bad for my needs.
Last edit: 16 Jul 2016 13:29 by tarasko.

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16 Jul 2016 13:33 #77544 by tarasko
Just want to share my impression regarding to hardware usage. So I bought Gygabite H81M micro ITX motherboard with an LPT port. CPU is Intel Pentium G3260.

This board has few bugs.
Sometimes it doesn't shutdown/suspend (just hanging).
I found prolem with usage of 5 meters long HDMI cables. My monitor doesn't detect signal. With short HDMI cables all works, but >= 5 meters is a problem.

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16 Jul 2016 17:58 #77547 by tommylight

I found prolem with usage of 5 meters long HDMI cables. My monitor doesn't detect signal. With short HDMI cables all works, but >= 5 meters is a problem.


You have a really bad quality cable, i have a 20 meter long one installed at and it is working without visible artefacts at HD resolution (not full HD). Try to find a better quality cable, it should work, or try using lower resolution if you can.
Regards,
Tom
P.S.
I did pay 45 euros for that that cable, and i consider that very cheap.

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18 Jul 2016 20:02 #77613 by tarasko
Do you use integrated graphics?

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