Hi, I am currently using for a customer a 5.0.19-rt11 on an i.MX6 and it works very well ! :) I have a latency issue, and tried to use wakeup_rt latency to detect it but I am not sure to really understand the output of ftrace... >From what I understand, the interrupt "irq/28" is having a latency of ~2ms ?? It sound like a very big latency ! And this customer has forced affinity and priorities on its threads, and I think it could explain such a behaviour ? For instance the task named "tLaserLo-762" is in fact forced with an affinity of 2 and a priority of SCHED_FIFO 30. https://framabin.org/p/?e63c638b5cf2e4ec#GS6ahFDEI/m6vyY2lwafB96vbgA4Skft1d+Dvtry2QI= I think it gives a very nice example of what preemption really is, but it can be confusing. Can it be traced with kernelshark or something else ? Thanks, JM
