Testers Needed for New RTAI Packages

I have tried the RTAI packages from Andys git repo and it seem to work fine on my dual core computer running Stretch.

The only issue I have is that it restricts the monitor to 1024x768. I haven't looked too hard to find what is causing this.

I also managed to build LinuxCNC 2.9 and it worked fine as well.

I did some air cutting on my mill with no issues.

Here are a latency-histogram from the one computer with RTAI and PREEMPT_RT for a comparison. Both are on identical SSD hard drives.

RTAI


PREEMPT_RT

Are you using an nvidia GPU card? The nvidia drivers are going to cause problems with RTAI. nouveau is disabled in the kernel.

No, it is an Intel 915. These are what I get from lspci -k

4.9.0-11-amd64


4.14.148-rtai-amd64

Do you recall where you got RTAI for a Rpi2? The source at rtai.org is usually broken.

It one of the first machinekit images.

@1024x786 resolution: I have this, too, on intel onboard graphics.

@1024x786 resolution: I have this, too, on intel onboard graphics.

The RTAI dev has been using AMD hardware. He will look into what he left out that is required to support Intel graphics.

Here are some findings after having it successfully tested last night:
MB=Asrock D1800B-TX fan less, 4GB Ram, 320GB HDD, Parallel port on board.
-Linux Mint 19.2 with 4.16.12-rt5-kona-rt_amd64, Linuxcnc 2.9
---latency around 200.000
---youtube videos on Firefox only at 480p
---slugish
-Linux Mint 19.2 with this RTAI and the 2.8 version on the same github page
---Latency under 20.000, base thread set at 20.000 never get latency errors
---youtube videos at 1080p/60fps on firefox
---feels much snappier.
---some strange errors with updating the screen, can not rotate the screen, and some other video related stuff.
I can live with that.
I did install this on the same system while RT kernel was installed, for some reason it would not boot! Clean install boots properly.
Thank you all. This means i can wire Mesa THCAD directly to parallel port at 1/32 and still have plenty of room.

Is there a dev version of that Linuxcnc somewhere ? I could not find it on github, i need halcompile.

tommylight wrote: Is there a dev version of that Linuxcnc somewhere ? I could not find it on github, i need halcompile.

Have a look inside www.linuxcnc.org/temp

You probably need the kernel + rtai and LinuxCNC + dev as a matched set. (that's a 4.14.148 kernel that was built last week)

andypugh wrote: Have a look inside www.linuxcnc.org/temp

You probably need the kernel + rtai and LinuxCNC + dev as a matched set. (that's a 4.14.148 kernel that was built last week)

Yup, everything is there, thank you.
Had to uninstall and reinstall, but it does work.

I just tested the new version. Everything works like expected

Just 2 points to note:
- the linuxcnc package requires python-vte, which is not to be found in buster/beowulf any more.
- screen resolution is still 1024x768 on intel gpu.

Otherwise, very pleased.