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

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05 Dec 2023 16:14 #287287 by Mr. Mass
Tried it without the base period, board with J1800: 

 

In any case on the same hardware latency is many times more than on 2.8.4.

Also tried it on an old desktop, E8200, 2GB of memory (one slot on the board doesn't work for some reason), video Radeon HD5450 512Mb:

 

And without GPU:

 

And now I have a dilemma: to use these mini-itx boards with large latency or to put mesa everywhere (but it happens better to use LPT for simple machines). Or look for desktop hardware, but it is not always convenient to place it.
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05 Dec 2023 20:18 #287307 by cornholio
Mesa is great, lots of io, very well supported and reliable.
Pete’s support is out of this world, even to the extent of answering questions regarding running Mesa firmware on Spartan 6 development boards.
Plus it takes the frustration out of latency issues.
Regarding desktops, I have a Lenovo M72e, mini tower, that I found on the street curb, $20 for an quad core I5 and it has awesome latency. Word of warning tho, whilst it does have an on board Parallel port header it does require a genuine Lenovo parallel port cable to work. Tried a standard one and no luck. Haven’t done any reverse engineering of it.

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05 Dec 2023 20:46 #287309 by tommylight
For parallel port use the Buster official ISO and install the RTAI kernel as described in the downloads page.
For mesa, use the 2.9.1 ISO or install Debian 12 BookWorm and do
sudo apt update
sudo apt install linuxcnc-uspace
reboot and enjoy.

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05 Dec 2023 20:50 #287310 by tommylight

Word of warning tho, whilst it does have an on board Parallel port header it does require a genuine Lenovo parallel port cable to work. Tried a standard one and no luck. Haven’t done any reverse engineering of it.

Normal or mini header?
For normal header with normal DB25 port/cable, the side with the red line on the wire goes on the pin1 side of the header. Be aware that some DB25 adapters/cables have that backwards, so inserting it in reverse bares no risk and might work.

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05 Dec 2023 22:08 - 05 Dec 2023 22:25 #287316 by cornholio
Using a normal 0.1" header the parallel port options aren't shown in the BIOS setup. Use the Lenovo one and they show up. I'm guessing that one of the GND pins or pin 26 is connected to a GPIO on the incarnation of the Super IO chip. I know that for the serial port header there is a COM_DETECT pin, so the same kind of thing is at play with the Parallel I guess.

Like I said I didn't decide to pull the thing apart to find out what was going on.

Seems to be pin 18 on the header is the PR_DET# pin.
Last edit: 05 Dec 2023 22:25 by cornholio.
The following user(s) said Thank You: seuchato

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08 Dec 2023 12:32 - 08 Dec 2023 12:34 #287524 by Glite
Asus Prime J4005I-C
Turbo boost enabled
C states disabled
Command line: idle=poll mitigations=off cpufreq.default_governor=performance 
7203 s  servo min: -88.800 us max:  92.000 us sdev: 2.600 us 
Core 0: +68.0°C (high = +105.0°C, crit = +105.0°C) 
Core 1: +68.0°C (high = +105.0°C, crit = +105.0°C)
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Last edit: 08 Dec 2023 12:34 by Glite.
The following user(s) said Thank You: seuchato, tommylight, zmrdko, Unlogic

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11 Dec 2023 12:26 #287849 by CNC_ANDI
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11 Dec 2023 15:55 #287859 by tommylight
There is no latency data in the file you attached @CNC_Andi

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11 Dec 2023 17:08 #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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14 Dec 2023 08:04 #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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