RTPREEMPT vs RTAI

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26 Mar 2020 18:31 #161598 by snowgoer540
Replied by snowgoer540 on topic RTPREEMPT vs RTAI

BeagleBrainz wrote: Ok have a MATE desktop version with 2.9 uploading. Very very slow upload speeds here at the moment.
It’s about 2300 here now expect the link put up sometime around 0500 my time. Not gunna stay up all night this time ;)


Oh man this is awesome! Thank you so much! Definitely saves me a ton of head scratching lol.

-Greg

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26 Mar 2020 19:37 #161609 by BeagleBrainz
The following user(s) said Thank You: snowgoer540

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27 Mar 2020 13:57 #161704 by snowgoer540
Replied by snowgoer540 on topic RTPREEMPT vs RTAI
Did the install. Everything seems to have gone well (havent launched LinuxCNC yet though).

I had some questions:

1. Should I do the update to 19.3 Tricia?
2. The update manager shows a lot of updates, wondering if I should do them? One of them is a Kernel update...
3. The latency is hovering between 50000 and 75000 ns. With the RTAI build I was using, I was seeing sub 8000 pretty consistently. Remember I am using the PCIe (6i25) mesa card. Am I going to be OK, or should I be using RTAI?

Thanks,
Greg

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27 Mar 2020 14:10 #161705 by bbsr_5a
Replied by bbsr_5a on topic RTPREEMPT vs RTAI
latency below 1000k is good to go
the mesa goit its own timing
and the linuxcnc will use 100k eighter
if you do not plan to run a haxapod or a highspeed >25m/min at low resolution it is also good on a C10 or 5AxisM_BOB

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27 Mar 2020 14:42 - 27 Mar 2020 14:56 #161706 by BeagleBrainz
Replied by BeagleBrainz on topic RTPREEMPT vs RTAI

snowgoer540 wrote: Did the install. Everything seems to have gone well (havent launched LinuxCNC yet though).

I had some questions:

1. Should I do the update to 19.3 Tricia?
2. The update manager shows a lot of updates, wondering if I should do them? One of them is a Kernel update...
3. The latency is hovering between 50000 and 75000 ns. With the RTAI build I was using, I was seeing sub 8000 pretty consistently. Remember I am using the PCIe (6i25) mesa card. Am I going to be OK, or should I be using RTAI?

Thanks,
Greg


No don’t update to tricia there’s no need.
Right click on the kernel and select ignore all future updates or something along those lines.
Then you can do the updates.
After that you should be good to go.

Hmmm on second thoughts having a lot of updates seems strange, as when I made the ISO I did update all the packages. Oh well doesn’t really matter.
If you are really concerned about latency the XFCE version may lower that. MATE is more a resource heavy desktop than XFCE.
Last edit: 27 Mar 2020 14:56 by BeagleBrainz.

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27 Mar 2020 15:36 #161711 by tommylight
Replied by tommylight on topic RTPREEMPT vs RTAI

bbsr_5a wrote: latency below 1000k is good to go

That is also not correct, 200k to 300k can work but not always as they might have excursions that surpass that.

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27 Mar 2020 18:08 #161728 by snowgoer540
Replied by snowgoer540 on topic RTPREEMPT vs RTAI

BeagleBrainz wrote:

snowgoer540 wrote: Did the install. Everything seems to have gone well (havent launched LinuxCNC yet though).

I had some questions:

1. Should I do the update to 19.3 Tricia?
2. The update manager shows a lot of updates, wondering if I should do them? One of them is a Kernel update...
3. The latency is hovering between 50000 and 75000 ns. With the RTAI build I was using, I was seeing sub 8000 pretty consistently. Remember I am using the PCIe (6i25) mesa card. Am I going to be OK, or should I be using RTAI?

Thanks,
Greg


No don’t update to tricia there’s no need.
Right click on the kernel and select ignore all future updates or something along those lines.
Then you can do the updates.
After that you should be good to go.

Hmmm on second thoughts having a lot of updates seems strange, as when I made the ISO I did update all the packages. Oh well doesn’t really matter.
If you are really concerned about latency the XFCE version may lower that. MATE is more a resource heavy desktop than XFCE.


Ok, I will skip Tricia, and ignore the kernel. Here is a list of the other updates it was asking for:

1. casper - Run a "live" preinstalled system from read-only media
2. fwupd - firmware to update daemon
3. fwupdate - tools to manage UEFI firmware updates
4. mesa - Mesa VA-API video acceleration drivers

In all honestly, I really have no idea if I should be worried about latency or not. I see so much data on the matter on other threads, but I really cant find a concrete whats good, whats bad, when its OK, when it's not. All I know for certain is lower is better, but I have no idea why.

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27 Mar 2020 19:00 #161731 by tommylight
Replied by tommylight on topic RTPREEMPT vs RTAI
1 you already have that
2?
3?
4?
5 this is not windows.
And do not worry to much about latency, computer is the cheapest thing on a machine. Get one, test it and see if it work for you. Cheap use "enterprise edition" Dell and HP and some later Fujitsu will do just fine at prices from 30 to 100$.

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27 Mar 2020 21:23 #161754 by BeagleBrainz
Replied by BeagleBrainz on topic RTPREEMPT vs RTAI
Ignore those updates, you can do the same thing you did for the kernel so you don’t get asked again.

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