Buildbot + Debian 11 / Bullseye Questions

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10 Oct 2021 09:51 #222725 by phillc54

I think the right path forward is work with the Debian guys to have a deb for 2.9 branch published in the debian repos.


There is work currently being done to achieve this.
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10 Oct 2021 09:53 #222726 by rodw

I think the right path forward is work with the Debian guys to have a deb for 2.9 branch published in the debian repos.

There is work currently being done to achieve this.

Awesome news Phill. We really need a Debian 11 deb file available before then though.

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10 Oct 2021 11:40 #222738 by hhogendoorn
I do have a problem with the Latency test on Debian 11 (with 2.9), the value is around 90000 ns, with Debian 10 (2.8.2) the Latency is around 15000 ns.

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10 Oct 2021 18:29 #222789 by rodw

I do have a problem with the Latency test on Debian 11 (with 2.9), the value is around 90000 ns, with Debian 10 (2.8.2) the Latency is around 15000 ns.

It may  not work for your hardware, but open grub-customizer and replace
quiet
with
quiet isolcpus=1,2,3 idle=poll
 

This dropped latency from 183k to 22k for my J1900 with xfce GUI
installing Mate increased it to 86k whch is still OK for a Mesa card.
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10 Oct 2021 21:02 #222795 by Joco
That's interesting re Xfce v's Mate.  I guess I should have expected it but that is quite a delta.  I might need ot try Xfce on my HP T730 at some point and see how it behaves.   I'm getting circa 40k with Mate installed and the cpu isolation in place.

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10 Oct 2021 21:08 #222796 by Joco

I do have a problem with the Latency test on Debian 11 (with 2.9), the value is around 90000 ns, with Debian 10 (2.8.2) the Latency is around 15000 ns.
 

These things do seem to be dependent on your h/w.  Even after applying the kernel boot options Rod mentions.
I have tested Debian 10 and various flavours of RT kernel version and 2.8 or 2.9 on some kit and found the only way I could get decent latency (i.e. substantially sub 100k) was to use Mint19 with a 4.x RT kernel.

So if things are not to your liking using Debain you can get good results by using other Linux flavours.  You just need to be prepared to put the time in to experiment.

Cheers - J.

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10 Oct 2021 21:10 #222797 by rodw

That's interesting re Xfce v's Mate.  I guess I should have expected it but that is quite a delta.  I might need ot try Xfce on my HP T730 at some point and see how it behaves.   I'm getting circa 40k with Mate installed and the cpu isolation in place.

I was thinking afterwards it might not be all mate becasue I have also added a FTP server and a XRDP server to it as well before adding Mate.. Maybe they've added a bit of a hit.
This method makes the change trivial...
bytexd.com/switch-desktop-environments-u...-debian-commandline/

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10 Oct 2021 23:02 #222808 by Joco
the XRDP server will be the one most likely to create a hit  SSH/FTP are very light weight.

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11 Oct 2021 02:25 - 11 Oct 2021 02:26 #222814 by phillc54

I think the right path forward is work with the Debian guys to have a deb for 2.9 branch published in the debian repos.

There is work currently being done to achieve this.

Awesome news Phill. We really need a Debian 11 deb file available before then though.

github.com/LinuxCNC/linuxcnc/pull/1298
Last edit: 11 Oct 2021 02:26 by phillc54.
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11 Oct 2021 10:13 #222835 by hhogendoorn
Saves about 50% , thanks!
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