How to investigate different timings of 2 HW with same kernel ?

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Hello,

We are using same BSP , Gentoo 3.18.11 rt7, with 2 different hadrwares:
1. kontron board
2. portwell board.

Both use came cpu intel i7.
Yet, the results are totally different with the same testing.

In kontron the error is 11usec, while in portwell it is 2000usec .

Testing is done using:
https://github.com/nma/preempt-rt/blob/master/test-rt.c

Is there any idea, how to start investigating such issue ?

Thank you,
Ranran
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