HM2_ETH >> iptables >> hm2−eth−rules−output

Ok, this is probably in the wrong section, but it was here or driver boards section as far as I could see....

In short, is there a way to define through the iptbles chain "hm2−eth−rules−output" which ethernet port to use {such as enp2s0}

I've still got an error that pops up (hm2/hm2_7176e.0: error finishing red! iter=6) and i am wondering if it may go away if i define the ethernet port + set the speed, duplex etc

the error pops up right at the start of linuxcnc always at iter=6.....

hence looking to try to better define some of the static settings so there is less autoneg of settings and potential hiccups

route:

note: I am going to use 2x mesa cards (only 1 is actually networed at present (both have the same issue with the error which I thought was latency) I am intending to use the cards on the same machine with different ini+hal files not at the same time
7i76e + 7i93H

wifi is via a pcie card (ive tried with the card removed and a usb wifi dongle and mo impovement).

just rerunning the latency now, will post shortly

5x glxgears using :

running "ping" with Mesa hardware over a short length of network cable (1 to 3 feet / 300mm to 1m)

what sort of times should you be looking at?

I am getting 1.02mS ..... seems a bit long / slow.... but it would be nice to have an idea of what numbers I should be expecting.

( ok.... I am using cat5 outdoor cable over a short length 1 ft / 300mm with 2 X self crimped push through rj45 connectors.... the cable is actually a crossover cable and the ethernet ports use auto MDI-X.....)

I am awaiting a pair of better quality proprietary patch cables to try.....

For example my times. I have approx 10m cat 7 S/ftp cable to mesa card.
3 network cards in PC. Outside, Simulator and Machine.
and it works out of the box with debian stretch. Simple config over network-manager-app in Xfce.
I would try to start with another cable..

thanks, new. cable awaited

confirmed my suspicions that something. is wrong

hmm.... no change..... cat8 patch cable (not necessary but thought it would be better quality given the higher speed rating capability) no other network devices straight from pc to 7i76e

maybe I've turned off something in the bios, but it's set to.full duplex 100

ping starts at 2.03 and second ping at 1.02/3 ms and hovers at that

hardware-irq-coalesce-rx-usecs 0 {I tried typing it in so there was no mistakes as seems to have been common on other posts}

did not work for me using the linuxcnc 2.8 iso

however installing ethtool and using within the interfaces file

post-up ethtool -C <adapter> rx-usecs 0

did work. {my intel card has a 3us rx-usecs setting as default}
Note: there was some trial and error about the location of adding the string to the interfaces file as it seemed sensitive as sometimes it was applied and sometimes not {given I have two inbuilt NIC's / ethernet ports} the best I found was to add them at the end of the file.... some posts suggested adding a sleep 5 to allow the cards and network to come up, I had success with "up-post" and putting them at the end of the interfaces file at present. I have also set speed 100, duplex full, mdix off and autoneg off..... although that does not seem to improve anything connection wise in my investigattion to lower the ping latency below ~0.200mSec latency

hardware-irq-coalesce-rx-usecs 0
was interesting as it did seem to apply (given ethtool -c <adapter> listed all values as zero)
but the ping times were high at 1.02/1.03 ms plus.

they have now dropped down to around 0.200 ISH (0.230 to about 0.175 and an occasional regular blip of 0.075 msec).... does not matter which ethernet cables I use between 300mm and 1m long (1-3 ft)

..... still investigating options....

wondering what other possible latency issues there may be to do with the sending and receiving of data packets across a wired network

{I'm going to have a look at flow control and see if it makes any other difference.

I have been through the bios 10's of time changing settings and retrying. At the moment for linuxcnc the best linuxcnc latency I have is with hyperthreading turned ON, c-states off, EIST / Speedstep off, virtualization off etc, anything ACPI / saving / throttling off, soundcard off etc.
I then used isolcpus=1,3 within grub and I get stable +/- 20 jitter with just running 5x glxgears and surfing the net (not that I intend to do that when machining...., and it rises to +/-50 jitter with youtube running and 5x glxgears