Nach Neuinstallation upgrade auf Kernel-Release 6.3.0-rt11-linuxcnc

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11 months 2 weeks ago #338239 by Jensner
Hallo Leute,

nachdem ich nach ständigen Fehlermeldungen bei
Code:
sudo apt update
den Rechner nun nochmal komplett neu aufgesetzt habe, funktioniert nun alles sauber und ohne Fehlermeldungen, jedoch ist die Latency sehr viel schlechter als vorher.

Da ich von der alten und neuen Installation jeweils ein Image gezogen hatte, kann ich hier (mit etwas Zeitlichem Aufwand) schön vergleichen.
Nun ist mir im Latency Test aufgefallen, dass die alte Konfig einen aktuelleren Kernel verwendet (6.3.0), die Neuinstallation jedoch den 6.1.0. Nun wollte ich auf die Version 6.3.0 upgraden. Da ich nach wie vor kein Debian-Experte bin, Google mir hier nicht wirklich weiter hilft und ich bei diversen Versuchen über den Paketmanager Key-Errors bekomme, frage ich mal in die Runde.

Hier mal die alte Installation (Kernel 6.3.0)
  

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Hier der frisch installierte Rechner
 

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Vielen Dank schon mal
Gruß Jens

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11 months 2 weeks ago #338245 by andypugh
Beide Latenzzeiten sind schrecklich.

The first image is running a realtime kernel, but the jitter is larger than is really useful. (0,4 ms in a 0,025ms thread will not work )

The second image shows a system that is not even running a realtime kernel, so the jitter is huge, 10ms or more.

You should try installing the latest realtime kernel and see if things improve after reboot.
sudo apt-cache search linux-image-rt
will give you a list of available realtime kernels. Find the newest listed and then
sudo apt-get install linux-image-rt{rest of the name}

Alternatively you could tre a fresh install from the LinuxCNC ISO image.

www.linuxcnc.org/downloads/

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11 months 2 weeks ago #338247 by Jensner
Hi Andy,

many thanks for your support.
What do you think would be the best / cleanest way?
Update or new installation with the ISO?

By the way, for my DELL Optiplex 3060 this would be the "LinuxCNC 2.9.4 Debian 12 Bookworm PREEMPT-RT ISO" ?

Best regards
Jens

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11 months 2 weeks ago #338249 by Jensner
Hello Andy 

"sudo apt-cache search linux-image-rt" gives me the following lines back:
Code:
linux-image-rt-amd64 - Linux für 64-Bit-PCs (Metapaket) linux-image-rt-amd64-dbg - Debugging symbols for Linux rt-amd64 configuration (meta-package)

There is no Version-Info.

.. doesn`t matter. I will install the LinuxCNC 2.9.4 Debian 12 Bookworm PREEMPT-RT ISO

Best regards
Jens

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11 months 2 weeks ago #338274 by Jensner
OK, installation is done.
At the moment the latency test looks like this:
 

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The only thing is that i allways get the same depending-problems, so i can not upgrade the kernel.
 

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Can someone help me here..
Thanks a lot
Jens

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11 months 2 weeks ago #338276 by Jensner

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11 months 2 weeks ago #338531 by andypugh
The latency looks OK now, 20k is very usable.

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11 months 1 week ago #338737 by Jensner
I think the problem is solved.
Thanks a lot.

Best regards 

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