Ethercat performance


Dubravko Moravski | Exor Embedded S.r.l. <dubravko.moravski@...>
 

Hello,

We want to use ACRN to, among other things, "talk" to Ethercat PLCs. Without ACRN, we get latencies of about 500 us. Acceptable latencies are generally below 1 ms. With ACRN (compiled in release mode) and the preempt-rt UOS, we get about 5 ms, which is close to usable, but not quite good enough.

Is there any setting or additional optimization we could turn on, that will get us lower latencies with ACRN?

We already did the cyclictest test, and were satisfied with those results.

When measuring Ethercat, I've also tried running a script recommended to be run before cyclictest, and that didn't help. Also I've tried adjusting bios settings, that also didn't help.


Dubravko Moravski
SW engineering
Exor Embedded S.r.l.
p: +38 512455659  m: +38 5915402413
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