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I cut a bunch of parts out using "sudo ethtool -C enp0s25 rx-usecs 0" and I did not get a single error when cutting this time. Everything worked how it was supposed to now I just need it to be permanent.

You have W3 down (you picture is upside down)
so not supplying 5V to the 7I76 You need W3 up
if the 7I76 is Jumpered to get cable 5V (7I76 W2 left)

W3 is one of the group of 3 jumpers under P1 but closest to
P2

1, Yes, the 7i76 has both 5V and field power
2. I believe that the flat cable is correct
3. The 7i76 is jumpered for power from the fpga card, however,
I am not certain of the 7c81 jumper w3. Is it supposed to be closer to the ribbon cable or farther from the ribbon cable.
The manual for the 7c81 says,
"Hardware setup jumper positions assume that the 7I98 card is oriented in an upright position, that is, with the Ethernet connector towards the left and the I/O connectors towards the right."
 

sudo ethtool -C enp0s25 rx-usecs 0

Will only work until you power cycle/reboot
but it should allow you to see if it fixes the problem

So I would try that, followed by a ping test
and then running the machine.

There are two ways to make the change permanent

1. Setup the Ethernet connection in the interfaces file
(and remove the setup created by the network manager GUI)
Typical interface content would be something like:

# interfaces(5) file used by ifup(8) and ifdown(8)
# Include files from /etc/network/interfaces.d:
source-directory /etc/network/interfaces.d
       auto enp0s25
       iface enp0s25 inet static
           address 10.10.10.100
           hardware-irq-coalesce-rx-usecs 0


The other option is to include the

ethtool -C enp0s25 rx-usecs 0

line in the rc.local script that is run at power-up



 

I am a bit confused am I not supposed to turn off my computer ever or do I need to wait longer for sudo ethtool -C enp0s25 rx-usecs 0 to work?

1. does the 7I76 have both 5V and field power?

2. Is the 7I76 connected to the 7C81 with the proper flat cable
1--> 1
2 -->14
3 --> 2
(what you get with standard IDC connectors)

3. Does the 7C81 cable power jumper match the 7I76
(that is both can be jumpered for 5V cable power or not but must match)


 

Now I get an error message on "hm2_7c81.0.7i76.0.0.output-00" that this pin doesn't exist.
it works on the 5i25 board and the 7i76e board.
hm2_5i25.0.7i76.0.0.output-00
hm2_7i76e.0.7i76.0.0.output-00

Any suggestions?

OK so it either did not work or you rebooted between
running:

sudo ethtool -C enp0s25 rx-usecs 0

and

sudo ethtool -c enp0s25

 

Possibly the executable path is different for root so ethtool is not found unless you use sudo

so maybe try:

sudo ethtool -c enp0s25

to see if IRQ coalescing is disabled

I dont think IRQ coalescing is disabled I still get the error every time. How do I disable IRQ coalescing permanently?
   

No, just incorrect reading of the name of the driver.

I guess the correct load line should read:
loadrt hm2_rpspi config="num_encoders=0 num_pwmgens=0 num_stepgens=3 sserial_port_0=0xxxxx"

Thanks.

Typo?

it should be hm2_rpspi

I did:
sudo mesaflash --device 7c81 --spi --addr /dev/spidev0.0 --write 7c81_7i76x2d.bit
and
sudo mesaflash --device 7c81 --spi --addr /dev/spidev0.0 --reload
when I tried to run linuxcnc I got an error about no hm2_rspi.so found.
How do I make sure hm2_rspi is on my system?

That should about do it as long as you have 7C81+7I76 firmware installed on the 7C81