LinuxCNC on Raspberry Pi 5

Seems ATM the RPi5 isn't the best candidate for Linuxcnc.

Here's half a days worth of pinging a 7i96S on a Intel PC:

sudo chrt 99 ping -i .001 -q 10.10.10.10
PING 10.10.10.10 (10.10.10.10) 56(84) bytes of data.

^C--- 10.10.10.10 ping statistics ---
72908387 packets transmitted, 72908387 received, 0% packet loss, time 72908386ms
rtt min/avg/max/mdev = 0.067/0.082/0.361/0.010 ms

 

This command FOLLOWED BY CTRL+C consistently leads to a single dropped packet in about 50% of runs. Perhaps this is happening due to the Ctrl+C causing the code to exist a loop somewhere while not awaiting the last packet to return from the 7i96s...?

sudo chrt 99 ping -O -i .001 -q 10.10.10.10

569 packets transmitted, 568 received, 0.175747% packet loss, time 568ms

1400 packets transmitted, 1399 received, 0.0714286% packet loss, time 1400ms

320 packets transmitted, 319 received, 0.3125% packet loss, time 319ms

Changing to

sudo chrt 99 ping -O -i .001 -q 10.10.10.10 -c 500

where the -c 500 causes the ping code to exit after 500 cycles consistently (100%) results in 0% packet loss (ca. 20 attempts).

Probably not important, bu I cannot duplicate that:

pcw@pcw-HP-Compaq-Elite-8300-USDT:/proc/irq/25$ sudo chrt 99 ping -i .001 -q 10.10.10.10
PING 10.10.10.10 (10.10.10.10) 56(84) bytes of data.
^C
--- 10.10.10.10 ping statistics ---
532 packets transmitted, 532 received, 0% packet loss, time 531ms
rtt min/avg/max/mdev = 0.073/0.083/0.110/0.006 ms
pcw@pcw-HP-Compaq-Elite-8300-USDT:/proc/irq/25$ sudo chrt 99 ping -i .001 -q 10.10.10.10
PING 10.10.10.10 (10.10.10.10) 56(84) bytes of data.
^C
--- 10.10.10.10 ping statistics ---
500 packets transmitted, 500 received, 0% packet loss, time 499ms
rtt min/avg/max/mdev = 0.071/0.083/0.116/0.006 ms
pcw@pcw-HP-Compaq-Elite-8300-USDT:/proc/irq/25$ sudo chrt 99 ping -i .001 -q 10.10.10.10
PING 10.10.10.10 (10.10.10.10) 56(84) bytes of data.
^C
--- 10.10.10.10 ping statistics ---
1143 packets transmitted, 1143 received, 0% packet loss, time 1142ms
rtt min/avg/max/mdev = 0.072/0.083/0.111/0.006 ms
pcw@pcw-HP-Compaq-Elite-8300-USDT:/proc/irq/25$ sudo chrt 99 ping -i .001 -q 10.10.10.10
PING 10.10.10.10 (10.10.10.10) 56(84) bytes of data.
^C
--- 10.10.10.10 ping statistics ---
908 packets transmitted, 908 received, 0% packet loss, time 906ms
rtt min/avg/max/mdev = 0.073/0.083/0.114/0.006 ms
pcw@pcw-HP-Compaq-Elite-8300-USDT:/proc/irq/25$ sudo chrt 99 ping -i .001 -q 10.10.10.10
PING 10.10.10.10 (10.10.10.10) 56(84) bytes of data.
^C
--- 10.10.10.10 ping statistics ---
565 packets transmitted, 565 received, 0% packet loss, time 564ms
rtt min/avg/max/mdev = 0.072/0.083/0.114/0.006 ms
pcw@pcw-HP-Compaq-Elite-8300-USDT:/proc/irq/25$ sudo chrt 99 ping -i .001 -q 10.10.10.10
PING 10.10.10.10 (10.10.10.10) 56(84) bytes of data.
^C
--- 10.10.10.10 ping statistics ---
421 packets transmitted, 421 received, 0% packet loss, time 420ms
rtt min/avg/max/mdev = 0.072/0.083/0.112/0.006 ms
pcw@pcw-HP-Compaq-Elite-8300-USDT:/proc/irq/25$ sudo chrt 99 ping -i .001 -q 10.10.10.10
PING 10.10.10.10 (10.10.10.10) 56(84) bytes of data.
^C
--- 10.10.10.10 ping statistics ---
332 packets transmitted, 332 received, 0% packet loss, time 331ms
rtt min/avg/max/mdev = 0.073/0.084/0.116/0.007 ms
pcw@pcw-HP-Compaq-Elite-8300-USDT:/proc/irq/25$ sudo chrt 99 ping -i .001 -q 10.10.10.10
PING 10.10.10.10 (10.10.10.10) 56(84) bytes of data.
^C
--- 10.10.10.10 ping statistics ---
381 packets transmitted, 381 received, 0% packet loss, time 380ms
rtt min/avg/max/mdev = 0.072/0.084/0.112/0.007 ms
pcw@pcw-HP-Compaq-Elite-8300-USDT:/proc/irq/25$ sudo chrt 99 ping -i .001 -q 10.10.10.10
PING 10.10.10.10 (10.10.10.10) 56(84) bytes of data.
^C
--- 10.10.10.10 ping statistics ---
588 packets transmitted, 588 received, 0% packet loss, time 587ms
rtt min/avg/max/mdev = 0.073/0.083/0.120/0.006 ms
pcw@pcw-HP-Compaq-Elite-8300-USDT:/proc/irq/25$ sudo chrt 99 ping -i .001 -q 10.10.10.10
PING 10.10.10.10 (10.10.10.10) 56(84) bytes of data.
^C
--- 10.10.10.10 ping statistics ---
484 packets transmitted, 484 received, 0% packet loss, time 483ms
rtt min/avg/max/mdev = 0.073/0.084/0.122/0.007 ms
pcw@pcw-HP-Compaq-Elite-8300-USDT:/proc/irq/25$ sudo chrt 99 ping -i .001 -q 10.10.10.10
PING 10.10.10.10 (10.10.10.10) 56(84) bytes of data.
^C
--- 10.10.10.10 ping statistics ---
452 packets transmitted, 452 received, 0% packet loss, time 451ms
rtt min/avg/max/mdev = 0.073/0.084/0.109/0.006 ms

 

Try another keyboard.

LOL wasn't sure whether you were having me on or not... anyways, I unplugged the wireless KB/mouse dongle and replaced it with a wired KB....... the 1x dropped packet issue remains. Weirdy.