cant run latency histogram

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08 Aug 2026 17:12 #348561 by rubes
cant run latency histogram was created by rubes
i installed linuxcnc 2.9.10 via the released ISO. when i run the latency histogram from the application menu, it logs me out and pops up the login screen. i login again, and then the latency histogram program wont run at all. neither will the regular latency test. if i reboot, i can run the regular latency test, but if i try the histogram, it logs me out again.
is this a bug or maybe something wrong with my new system? 
i have
this motherboard , basically because i have one in my daily desktop, and it was cheap
this graphics card , because it is AMD not Nvida that was causing issues with scrambled screen
this network card , because it uses the intel chipset rather than the realtek one on the motherboard

 

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08 Aug 2026 17:28 #348562 by tommylight
Replied by tommylight on topic cant run latency histogram
Download the ISO again, check the md5sum or sha256 or whatever there is to make sure the ISO is OK, write to usb using DD in Linux or Balena etcher on windows (work on Linux also), try again.
If it fails after all that, disable "secure boot" in BIOS. You can try this first with the existing usb, might just work.

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08 Aug 2026 19:08 #348568 by rubes
Replied by rubes on topic cant run latency histogram
this is where i fall flat on my face with linux, cant find an MD5 checksum for linuxcnc_2.9.10-amd64.hybrid.iso anywhere.
this page still shows the 2.9.8 checksums.

here is what i get when using windows command promt:

MD5 hash of c:\linuxcnc_2.9.10-amd64.hybrid.iso:
fc1aa63d54babf5fc840e1b6471cd75a
CertUtil: -hashfile command completed successfully.

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08 Aug 2026 19:53 #348569 by rubes
Replied by rubes on topic cant run latency histogram
cant find any mention of secure boot in the BIOS anywher. and as much as i hate AI, this is what i get when asking google...

  

guess i made a bad hardware choice.
 
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08 Aug 2026 20:07 - 08 Aug 2026 20:08 #348570 by PCW
Replied by PCW on topic cant run latency histogram
Try running the latency test with a slower base thread rate  (or no base thread at all if you do not intend to use a parallel port)

latency-histogram --base 100000

( for a 10 KHz base thread )

or

latency-histogram --nobase

for a servo thread only latency test
Last edit: 08 Aug 2026 20:08 by PCW.

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08 Aug 2026 21:08 #348571 by rubes
Replied by rubes on topic cant run latency histogram
yep, not intending to use a paraport as i have a Mesa 7i96s. Which brings up a question, if i use the P1 parallel expansion port on the 7i96s, is the base thread still irrelevant? not that i would use that for step.direction, just GPIO.
I guess I really need to learn ALOT more about Linux and command prompt use. I'm a windows user so always gravitate to graphical UI rather than terminal. so just picking histogram from the dropdown i get what i get. I dont know enough about the terminal commands to know any better.
thanx for the help though. 

p.s. not tryin to be an azz but??
latency-histogram --base 100000
( for a 10 KHz base thread )

isnt that 100KHz?? 

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08 Aug 2026 22:31 #348573 by PCW
Replied by PCW on topic cant run latency histogram
P1 can be used for step/dir with the right firmware (that puts stepgens on those pins)
Mesa Ethernet cards don't use the base thread at all.

latency-histogram --base 100000

Means the base thread _period_ is 100000 ns = 100 us, 1/100us = 10 Khz

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08 Aug 2026 23:35 #348575 by rubes
Replied by rubes on topic cant run latency histogram
doh!!!! thanx for the reminder in how to do basic frequency conversions...LOL

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08 Aug 2026 23:45 #348576 by NWE
Replied by NWE on topic cant run latency histogram
Google ai's answer is quite incorrect. I don't see what cpu you got, but with the motherboard you listed, I think any CPU it would be compatible with would have many times more capacity than what LinuxCNC could possibly use.

There are a couple different things that could cause your problem:
1. Possible data error during iso file download and install. Download a second copy and try that or maybe install 7zip which is one program I think of right now which makes it convenient to check sum files in Windows.
2. USB memory device error - try a different one.
3. Motherboard/hardware incompatibility. What you got certainly is fast and powerful enough for LinuxCNC but sometimes odd incompatibilities pop up between hardware/firmware/OS.

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09 Aug 2026 01:28 #348578 by tommylight
Replied by tommylight on topic cant run latency histogram
Open a terminal and type:
glxgears
if it crashes = change the graphic cars ... that usually can not be done as they are inside the CPU, but if you have a spare PCI-E slot, find an old one and give it a try.
If it runs fine, still i would insist on disabling secure boot and/or trying another ISO/USB.
The following user(s) said Thank You: NWE

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