Testers Needed for New RTAI Packages

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28 Oct 2019 07:07 #148962 by phillc54
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
Warning: Spoiler! [ Click to expand ]


PREEMPT_RT
Warning: Spoiler! [ Click to expand ]
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31 Oct 2019 01:22 #149247 by Bari
Are you using an nvidia GPU card? The nvidia drivers are going to cause problems with RTAI. nouveau is disabled in the kernel.

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31 Oct 2019 01:44 #149249 by phillc54
No, it is an Intel 915. These are what I get from lspci -k

4.9.0-11-amd64
00:00.0 Host bridge: Intel Corporation 4 Series Chipset DRAM Controller (rev 03)
	Subsystem: Acer Incorporated [ALI] 4 Series Chipset DRAM Controller
00:02.0 VGA compatible controller: Intel Corporation 4 Series Chipset Integrated Graphics Controller (rev 03)
	Subsystem: Acer Incorporated [ALI] 4 Series Chipset Integrated Graphics Controller
	Kernel driver in use: i915
	Kernel modules: i915
00:1b.0 Audio device: Intel Corporation NM10/ICH7 Family High Definition Audio Controller (rev 01)



4.14.148-rtai-amd64
00:00.0 Host bridge: Intel Corporation 4 Series Chipset DRAM Controller (rev 03)
	Subsystem: Acer Incorporated [ALI] 4 Series Chipset DRAM Controller
00:02.0 VGA compatible controller: Intel Corporation 4 Series Chipset Integrated Graphics Controller (rev 03)
	Subsystem: Acer Incorporated [ALI] 4 Series Chipset Integrated Graphics Controller
00:1b.0 Audio device: Intel Corporation NM10/ICH7 Family High Definition Audio Controller (rev 01)

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31 Oct 2019 06:33 - 31 Oct 2019 06:35 #149260 by twoflowers

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.
Last edit: 31 Oct 2019 06:35 by twoflowers.

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31 Oct 2019 06:44 #149262 by Bari

@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.
The following user(s) said Thank You: phillc54

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31 Oct 2019 10:31 - 31 Oct 2019 10:34 #149273 by tommylight
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.
Last edit: 31 Oct 2019 10:34 by tommylight. Reason: more info

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19 Nov 2019 13:14 #150639 by tommylight
Is there a dev version of that Linuxcnc somewhere ? I could not find it on github, i need halcompile.

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19 Nov 2019 13:19 #150641 by andypugh

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)

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19 Nov 2019 14:45 #150650 by tommylight

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.

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19 Nov 2019 20:00 #150676 by twoflowers
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.

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