Lower bound on kernel execution time

[flxinxout]

Hello developers,

While creating a very simple kernel using MLIR-AIE and testing it, I noticed a kind of lower bound on the kernel execution time, using XRT. I measured the time difference between the end of computation of my kernel and the start, and I get around 60 microseconds (so the function kernel() and wait())

Because I was not satisfied by this time, I created an "empty" kernel, doing nothing and moving no data. Using always XRT to call the kernel, I did the same computation to find the time for the kernel to run, and I found something like 45 microseconds.

My questions are

is it normal to have this overhead?
If yes, what are the option? Because actually, my CPU runs my computation faster then, and the NPU would be no need.
Thanks!