Linux crashed :(

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9 years 9 months ago #86758 by oceax
Linux crashed :( was created by oceax
Recently upgraded from 2.6 to 2.7 but i have also tried more aggressive timing settings and stepper movement speed, suddenly when i was milling, linux stopped

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9 years 9 months ago #86759 by PCW
Replied by PCW on topic Linux crashed :(
When you said "more aggressive timing settings", what were you referring to?

No motion timing or step timing should have any real effect on Linux
if you are using hardware stepgens

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9 years 9 months ago #86766 by oceax
Replied by oceax on topic Linux crashed :(
Ok, yes i use hardware stepgens. So i think the problem has to do with linuxcnc 2.7, because i have never had this problem before with 2.6 :/

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9 years 9 months ago #86772 by PCW
Replied by PCW on topic Linux crashed :(
Just guessing but it looks more kernel/low level servo thread related rather than LinuxCNC version related

What servo thread rate are you using?

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9 years 9 months ago #86775 by tommylight
Replied by tommylight on topic Linux crashed :(
Have a look at the top of the attached picture, it clearly says it could not handle a paging request, and is always a sign of failing memory, it has the address of the memory it failed to write or read.

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9 years 9 months ago #86847 by oceax
Replied by oceax on topic Linux crashed :(
in my ini file i have [EMCMOT]. SERVO_PERIOD=50000

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9 years 9 months ago #86848 by oceax
Replied by oceax on topic Linux crashed :(
Ok thanks,.... but could also be something with swap space or hard drive errors? but i will run a memtest

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9 years 9 months ago #86851 by PCW
Replied by PCW on topic Linux crashed :(

in my ini file i have [EMCMOT]. SERVO_PERIOD=50000


That's very likely why it crashed, a 20Khz servo thread is simply way too fast for most PCs/hardware

a 1000000 ns (1 ms) servo period is standard and unless you have a good reason to decrease this period
it should be left alone

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