1. LinuxCNC
  3. General LinuxCNC Questions
  5. Base jitter

Base jitter

More
20 Apr 2023 11:38 #269479 by Aram
Base jitter was created by Aram
Hi,

I am using a Fujitsu Workstation with intel xeon E3-1245v3 16GB RAM 128GB +  Quadro K4000.
When testing jitter i get an imensly high base jitter of 100000+. What could this be due to? Is there anything i can do to fix this?

I am using the latest debian version from the linuxcnc.org website.

I am a complete noob, so excuses if this is a stupid question :-) 

either way, thanks for the responds!!

Please Log in or Create an account to join the conversation.

  • tommylight
  • tommylight's Avatar
  • Away
  • Moderator
  • Moderator
More
20 Apr 2023 11:41 #269480 by tommylight
Replied by tommylight on topic Base jitter
Disable hyperthreading, power saving/management everything, virtualisation everything, C states, turbo boost, etc, in BIOS.
And even then might need to remove or change the graphic card, Nvidia has a history of messing latency.
The following user(s) said Thank You: Aram

Please Log in or Create an account to join the conversation.

More
20 Apr 2023 16:16 - 20 Apr 2023 16:18 #269490 by Aram
Replied by Aram on topic Base jitter
Hi

Thanks for the quick reaction. I updated the bios settings like you suggested.

This helped somewhat, but the base jitter is still +100000...

Could using different drivers for my graphics Card be a possible solution? If so what drivers would you recomend?

If this isn't an options, what graphics Card would you recommend? Running onboard graphics isn't possible i think...
Last edit: 20 Apr 2023 16:18 by Aram.

Please Log in or Create an account to join the conversation.

  • tommylight
  • tommylight's Avatar
  • Away
  • Moderator
  • Moderator
More
20 Apr 2023 20:21 #269509 by tommylight
Replied by tommylight on topic Base jitter
In a terminal:
uname -a
then also this
latency-histogram --nobase --sbinsize 1000 --show
That is if you do not need a parallel port.
Also, did you install nvidia drivers or not?
It is much better not to install them, using Noveau (Linux included drivers) is better, although you might want to try that later, after we close in on the culprit.

Please Log in or Create an account to join the conversation.

More
21 Apr 2023 08:35 #269540 by Aram
Replied by Aram on topic Base jitter
The plan is right now to use a parallel port to connect to a chinese breakout board. So as far as i know i do need a parallel port right?

I didn't install the drivers manually, could these be pre-installed, or are these most likely the nouveau drivers?

thanks for your patience with my un-educated questions...

Please Log in or Create an account to join the conversation.

  • tommylight
  • tommylight's Avatar
  • Away
  • Moderator
  • Moderator
More
21 Apr 2023 10:27 #269543 by tommylight
Replied by tommylight on topic Base jitter
Try installing the RTAI kernel, should do better
linuxcnc.org/docs/2.8/html/getting-start...#cha:Installing-RTAI

Please Log in or Create an account to join the conversation.

  1. LinuxCNC
  3. General LinuxCNC Questions
  5. Base jitter
Time to create page: 0.058 seconds
Powered by Kunena Forum