7i96 issue read/write

Okay. Thanks, for that. I thought that was the case. Ill remove the gui config and shift config to the etc file then since I assume the is no graphical way to configure these interrupt settings.

Some more testing today. Unfortunately this has not resolved the issue. Given that this is happening on two different machines with independent 7i96 cards I can at this point only assume it is the system itself or power related. Each cnc machine has an overspecified 5v psu (meanwell) solely for powering the 7i96. Voltages seem very stable and current is no where near what is required by the board. I have to at this point assume it is related to the comp as I'm running an early release of 2.9. As next step ill try updating this to a fresh install when my new ssd arrives.

Ping times are long even with irq settings enabled, circa 400ms in cases. I think I would benefit from a different kernel regardless. Some work to do...

I have changed a bunch of things over the past couple of days, moved up to Debian 11 building from Git, but found that it produced much higher servo jitter on my machine. On Stretch, Buster my machine is solidly under 5000 for servo, on 11 it jumped up to between 25,000 and 30,000.

I ended up wiping the drive and moving to Buster, my 2.9 configs would not play nicely with 2.8.4 so I upgraded to 2.9 and am able to start both machines now. I am running dry run tests on the router as we speak, with lower than normal velocities. I will bump this velocity up in stages over the next few days to see if I encounter this same error.. For reference the current Buster install is on 4.19.0-23-rt-amd, I am testing the Intel NIC with recommended IRQ coalesce settings applied.

Note that normal latency test measurements are not really significant
With Mesa Ethernet hardware (unless they greater than 100 or so usec)

Much more important is network latency, checkable with:

sudo chrt 99 ping -i .001 -q 10.10.10.10

(let run for a minutes or even hours) and stop with control C

I understand, but it is indicative of overall system stability. I have already ran ping tests on all systems as a rule. Honestly non of them are great but Buster is much more stable than v11 for me on this system for both network and servo. Also graphically v11 was sluggish on this box.

We'll see over the next few days how it goes, if I continue to have issue it will be a new computer order, I think. So far, buster seems good, comparible with stretch before I began to have issues. 

Did this ever get resolved?  I have a Raspberry Pi 5 and 7i96s and I am seeing the same issues:

hm2/hm2_7i92.0: error queuing read! iter=xxx
hm2/hm2_7i92.0: error finishing write! iter=xxx

forum.linuxcnc.org/9-installing-linuxcnc...i-5?start=110#293125