Strange error with mesa 7i76

Hi
I am setting up a mesa 7i76e card and on two cards I get these errors. They have me stumped.

The first error (which is really the only important one) indicates problems with latency

What kernel and PC hardware (including Ethernet chip) are you using?

You can get the kernel info with:

uname -a

Hi Peter

Linux cnc-mill 3.4-9-rtai-686-pae #1 SMP PREEMPT Debian 3.4.55-4linuxcnc i686 GNU/Linux

Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 05)

Architecture: i686
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 1
On-line CPU(s) list: 0
Thread(s) per core: 1
Core(s) per socket: 1
Socket(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model: 28
Stepping: 10
CPU MHz: 1800.050
BogoMIPS: 3600.10
L1d cache: 24K
L1i cache: 32K
L2 cache: 512K

And the latency test. I never know how to interpret this

OK, a couple of things...

1. You need Preempt-RT kernel to run Mesa Ethernet cards (you are running RTAI)
2. Dont know if you are running the uspace version of LInuxCNC or not but this is also required
3. You CPU looks like a Atom N270, even with the correct kernel this may not have enough
horsepower to run a Preempt-RT kernel and get decent latency YMMV
4. The easiest current way to get the proper kernel and uspace version of LinuxCNC
is to install the LinuxCNC/Debian Stretch test ISO:

www.linuxcnc.org/testing-stretch-rtpreem...-uspace-amd64-r9.iso

mariusl wrote: And the latency test. I never know how to interpret this

I think that the apposite phrase is "absolutely terrible". The jitter should be a small fraction of the period. Any more than 5% is too much.
Your jitter is 98% of the thread period.

Thanks Andy. I dropped that MB as it was old anyway.

So now I installed the image that Peter suggested. It installed OK but I cannot seem to get the eth0 to be recognized at all.

I put this code into the .etc/network/interfaces files.

auto eth0
iface eth0 inet static
address 10.10.10.1
hardware-irq-coalesce-rx-usecs 0

Is this still valid?

Any suggestions please?

At some point Linux changed all the device names, so
you probably need to find your Ethernet device name with:

ip a

also

hardware-irq-coalesce-rx-usecs 0

is only for Intel Ethernet chips