Results of latency test, list of computers tested for use with LinuxCNC

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2 years 10 months ago #287868 by seuchato

"Debian GNU/Linux 12 (bookworm)"...
Latency testing loop started Mon Dec 11 01:13:08 PM CET 2023,
should end after Mon Dec 11 03:13:08 PM CET 2023

Manual termination requested at 11.12.2023 13:23:52

@CNC_Andi:
  • As you are on bookworm, there are chances the script does not run properl on bookworm. I *think* it should do alright though, but I'll have to verify that. => Todo for myself
  • Delta t "Mon Dec 11 01:13:08 PM" (=13:13:08) to "11.12.2023 13:23:52 " is about 10 minutes only
  • As tommy pointed out: there is no latency data. Do you have a .lat file? if so, kindly post it
Greez
chris
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2 years 10 months ago #288111 by CNC_ANDI
Oh sorry.... wrong file...

Yes i run it at bookworm...

I will upload the other file later.
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2 years 10 months ago #288483 by seuchato
Hi all
Got all the data given in this thread now entered in a libre office table, see here .
Compiling this table helped me also to get an overview of what the script needs urgently. So hold on :-)
Greez
chris
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2 years 10 months ago #289431 by Ismacr63

That's pretty high indeed, did you try to disable as many as possible energy saving settings in the bios? Adding kernel parameters?

Perhaps there is a bad ram chip, you could try to remove 2 of them, 32gb is a lot for LinuxCNC, 4gb is enough most of the times. To keep dual channel, you probably need to have one in slot 1 and 3.

The kernel parameters that worked for my machine and you could try:
isolcpus=3 intel_pstate=disable processor.max_cstate=0 idle=poll cpufreq.default_governor=performance i915.enable_dc=0 ahci.mobile_lpm_policy=1 irqaffinity=0 nomodeset quiet
Hello, I have tested these kernel parameters, and I have managed to lower the latency to a stable 12k, but I have the problem that the screen resolution remains at 1028x768 instead of 1920x1080. I have removed the "nomodeset" and the resolution is set to 1920x1080 but the latency skyrockets.

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2 years 8 months ago - 2 years 8 months ago #294841 by routerman22
Dell optiplex 7050 micro  (SFF?) I5-6500 + ssd + 1x8gb ram (2 ram stick would be higher performance)
Old pic:
forum.linuxcnc.org/18-computer/39371-res...cnc?start=330#271103

added these gub parameters:
forum.linuxcnc.org/18-computer/39371-res...cnc?start=330#271127

+ this IRQ schipt mod (had to manually install irqbalancer) :  forum.linuxcnc.org/38-general-linuxcnc-q...ead-and-irq-affinity

= giant improvement :
8khz servo loop + 1 yt + 4x glx running @400-500fps 
image missing https://i.imgur.com/Zxz05zb.jpg
Last edit: 2 years 8 months ago by routerman22.
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2 years 7 months ago #295864 by spicybagel
New here and thought I would share a test from an older gaming pc I plan to use after getting some good results with it. This test was done from the bootable usb iso. Took lots of bios fiddling to get it this low.

pc specs:
  • cpu: amd ryzen 5 3600x
  • mobo: asrock b450 pro4
  • ram: 16gb ddr4
  • gpu: amd rx570
  • some random brand pcie wifi card
image missing https://i.imgur.com/L9Ng7hE.png https://imgur.com/a/71leQnJ
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