Installing LinuxCNC on Debian 9 - 13

Hi. in this particular case, I followed your instructions to install lcnc 2.9 on debian 11. as it was suggested above that the development branch has changed, then I get cloned not what I need. tomorrow I will try to clone with an explicit indication of the branch 2.9.

No need to re-clone, you can just

Or not bother. At the moment 2.9 and 2.10 are identical.

daiman444 wrote:

Hi. in this particular case, I followed your instructions to install lcnc 2.9 on debian 11. as it was suggested above that the development branch has changed, then I get cloned not what I need. tomorrow I will try to clone with an explicit indication of the branch 2.9.
 

Ok, that page needs fixing and I'll sort that out shortly.

JT

JT wrote:

After doing an update on debian 12 and 13 I see linux-image-6.00-2-rt-amd64 in synaptic, has anyone tried 6.0? with a Mesa ethernet card?

JT

I just did! And it works!  

So this is the very original Gigabyte N3160 PC I first installed linuxcnc on years ago. It was running Debian Bullseye 5.10 as an office PC for a long time so its had a few upgrades since while struggling with error finishing read which was an issue on it.

I did a full upgrade to Bookworm last night which gave me the 6.0 kernel and lost the network connection. The NIC was not there. I installed linux-headers and that seemed to rebuild the r8168-dkms driver before I did.
INstalled linuxcnc from the bookworm repo. Error finishing read is gone. Latency was around 130k until I added Isolcpus=2,3 Ping times to the 7i76e took quite a hit but Latency is amazing. It was around 0.100 ms before

Time will tell if I need to remove the isolcpus but at this stage everything appears normal.

PS: Also built a RIP install last night which was working too.

One of the things with isolcpus is the nic interrupt is probably being serviced by the same core as the servo thread which probably accounts for the slower ping times. You can see what cores are used if you type
cat /proc/interrupts

explore the output on the right hand side and you will see the NIC port listed
This old article, I think is useful but I don't think all interrupts go to the one core anymore
www.alexonlinux.com/smp-affinity-and-pro...pt-handling-in-linux

Also this  one too:
blog.dan.drown.org/nic-interrupt-coalesce-impact-on-ntp/
BUt it is not supported on my PC

With this in mind, is there any benefit to building from source? I'm running bookworm on a pretty healthy 4th-generation i5 system, and will be using a 7i96 board.