Parport to 7i92

Hello
I am running for several years a parallel port/gecko G540 linuxcnc for my home built little cnc and it was fine.
Motherboard is GIGABYTE GA-D525TUD.
From time to time, I had the well known popup window « Unexpected realtime delay...  » but I was able to machine my parts.
So lately I ordered a Mesa 7i92 and switched to V2.8 to have the real time part done by the card and to get rid of this warning message.
But, with the 2.8 kernel, latency is horrible (see screenshots in the attached files).
In PNCconf, on the Axis configuration page when testing motors, I have motor stalling randomly, even at lower mm/min than with V2.7.

Is it due to the poor latency performance or should I look for errors in my configuration files ? (HAL and INI for both version are also in the attached files)
Thanks
 

What does
uname -a
in a terminal say?
Did you install the 2.8.2 ISO or did you just upgrade LinuxCNC?
And yes, latency issues will cause stalling and missing steps.

1 I don't think the pncconf axis testing is going to work, you need to launch LinuxCNC to test

2. The D525 is a bit marginal for Ethernet at a 1 ms thread period so I would change:

setp hm2_7i92.0.dpll.01.timer-us -50
to
setp hm2_7i92.0.dpll.01.timer-us -200

and if you get real time warnings, increase the thread period
(to say 2 ms)

Note that for latency testing when using Mesa cards you don't
need a base thread so you will get more accurate results with

latency-histogram --nobase --sbinsize 1000

@ tommylight
uname -a
Linux Faiseuse 4.19.0-17-rt-amd64 #1 SMP PREEMPT RT Debian 4.19.194-3 (2021-07-18) x86_64 GNU/Linux


2.8.1 iso then I updated

Thank you for your quick answer

@PCW
1) With my current configuration, in linuxCNC, it stalls quickly when I jog at full speed. in pncconf it takes a bit longer with the +- 50mm test.

2) I will make the changes and test.

Many thanks for your help

Hello,

I made the tests within LinixCNC using your sugestion
* setp hm2_7i92.0.dpll.01.timer-us -200
* thread period : 2 ms
and it's much better I can now reach 1900 mm/min

Still have a few things to tweak, but I should be able to mill soon

Many thanks for your hep