Error message during operation with a 7i96s

Hi all,

I have an error message, which is displayed sporadically:

 

After that the 7i96s is no longer responsive and the red LED is on. Only a restart of LinuxCNC helps. Is this again a network problem?
LinuxCNC is 2.9.0~pre1

Peter
 

After starting LinuxCNC the same error occurs. Now iter=33970

Peter

That error is caused by excessive Ethernet latency

What does

uname -a

report?

and what are you ping times? (if you ping the 7I96S card)

What is you servo thread period?

Hi,

uname -a:
Linux LinuxCNC 5.10.0-18-rt-amd64 #1 SMP PREEMPT_RT Debian 5.10.140-1 (2022-09-02) x86_64 GNU/Linux

Ping times:

root@LinuxCNC:~# ping 10.10.10.10
PING 10.10.10.10 (10.10.10.10) 56(84) bytes of data.
64 bytes from 10.10.10.10: icmp_seq=1 ttl=64 time=0.553 ms
64 bytes from 10.10.10.10: icmp_seq=2 ttl=64 time=0.488 ms
64 bytes from 10.10.10.10: icmp_seq=3 ttl=64 time=0.207 ms
64 bytes from 10.10.10.10: icmp_seq=4 ttl=64 time=0.209 ms
64 bytes from 10.10.10.10: icmp_seq=5 ttl=64 time=0.220 ms
64 bytes from 10.10.10.10: icmp_seq=6 ttl=64 time=0.507 ms
64 bytes from 10.10.10.10: icmp_seq=7 ttl=64 time=0.419 ms
64 bytes from 10.10.10.10: icmp_seq=8 ttl=64 time=0.502 ms
64 bytes from 10.10.10.10: icmp_seq=9 ttl=64 time=0.190 ms
64 bytes from 10.10.10.10: icmp_seq=10 ttl=64 time=0.603 ms
64 bytes from 10.10.10.10: icmp_seq=11 ttl=64 time=0.556 ms
64 bytes from 10.10.10.10: icmp_seq=12 ttl=64 time=0.594 ms
64 bytes from 10.10.10.10: icmp_seq=13 ttl=64 time=0.613 ms
64 bytes from 10.10.10.10: icmp_seq=14 ttl=64 time=0.202 ms
64 bytes from 10.10.10.10: icmp_seq=15 ttl=64 time=0.435 ms
64 bytes from 10.10.10.10: icmp_seq=16 ttl=64 time=0.567 ms
64 bytes from 10.10.10.10: icmp_seq=17 ttl=64 time=0.202 ms
64 bytes from 10.10.10.10: icmp_seq=18 ttl=64 time=0.596 ms
64 bytes from 10.10.10.10: icmp_seq=19 ttl=64 time=0.594 ms
64 bytes from 10.10.10.10: icmp_seq=20 ttl=64 time=0.601 ms
64 bytes from 10.10.10.10: icmp_seq=21 ttl=64 time=0.584 ms
64 bytes from 10.10.10.10: icmp_seq=22 ttl=64 time=0.411 ms
^C
--- 10.10.10.10 ping statistics ---
22 packets transmitted, 22 received, 0% packet loss, time 21498ms
rtt min/avg/max/mdev = 0.190/0.447/0.613/0.159 ms
root@LinuxCNC:~#

and latency test:
 

Are these values too bad? How could I improve it?

Peter
 

some additional infos:

Kernel-Module:
e1000e intel pro 100/1000 Network Driver

-PCI Devices-
Ethernet controller : Intel Corporation Ethernet Connection (2) I219-V

-Computer-
Prozessor : Intel(R) Core(TM) i3-6100T CPU @ 3.20GHz
Hauptspeicher : 8034MB (2196MB used)
Maschinen-Typ : Desktop
Betriebssystem : Debian GNU/Linux 11 (bullseye)

Peter

The ping times are pretty bad.

What is the host PC?

If it has a Intel Ethernet chip you should disable IRQ coalescing

(as described in the hm2_eth manual page)

You can determine the Ethernet chip with:

lspci | grep -i ethernet

peter@LinuxCNC:~/vcp-template$ lspci | grep -i ethernet
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (2) I219-V

Ok, thanks - I'll read the hm2_eth manual page.

Peter

root@LinuxCNC:~# ethtool -c enp0s31f6
Coalesce parameters for enp0s31f6:
Adaptive RX: n/a  TX: n/a
stats-block-usecs: n/a
sample-interval: n/a
pkt-rate-low: n/a
pkt-rate-high: n/a

rx-usecs: 0
all other parameters are n/a

Now the ping time:

root@LinuxCNC:~# ping 10.10.10.10
PING 10.10.10.10 (10.10.10.10) 56(84) bytes of data.
64 bytes from 10.10.10.10: icmp_seq=1 ttl=64 time=0.143 ms
64 bytes from 10.10.10.10: icmp_seq=2 ttl=64 time=0.183 ms
64 bytes from 10.10.10.10: icmp_seq=3 ttl=64 time=0.164 ms
64 bytes from 10.10.10.10: icmp_seq=4 ttl=64 time=0.163 ms
64 bytes from 10.10.10.10: icmp_seq=5 ttl=64 time=0.162 ms
64 bytes from 10.10.10.10: icmp_seq=6 ttl=64 time=0.158 ms
64 bytes from 10.10.10.10: icmp_seq=7 ttl=64 time=0.174 ms
64 bytes from 10.10.10.10: icmp_seq=8 ttl=64 time=0.155 ms
64 bytes from 10.10.10.10: icmp_seq=9 ttl=64 time=0.181 ms
64 bytes from 10.10.10.10: icmp_seq=10 ttl=64 time=0.184 ms
64 bytes from 10.10.10.10: icmp_seq=11 ttl=64 time=0.254 ms
64 bytes from 10.10.10.10: icmp_seq=12 ttl=64 time=0.185 ms
64 bytes from 10.10.10.10: icmp_seq=13 ttl=64 time=0.160 ms
^C
--- 10.10.10.10 ping statistics ---
13 packets transmitted, 13 received, 0% packet loss, time 12287ms
rtt min/avg/max/mdev = 0.143/0.174/0.254/0.026 ms
root@LinuxCNC:~# 

I think, it's much better.

Peter
 

The Mesa ist directly connected, no hub, no switch, only a CAT 6a-cable.
LinuxCNC is running - no error yet...

Peter