STM32mp1 perf counters issue ?

[Kurt]

Hi,

I'm trying to have some accurate perf measurements with the STM32MP1 for my program on Linux. I've tried several things, among them to use perf Linux tool.

The number of cycles does not match the time elapsed, i.e. the freq processor is at 650Mhz and doing nbre_of_cyles/freq, I 'm quite far way from time elapsed (ratio around 3).

I've tried with freq scaling activated and desactivated, I've the same results.

Any clue ?

[Olivier GALLIEN]

Hi @Kurt​ 

Please confirm you are talking about same tools as describe here :

https://wiki.st.com/stm32mpu/wiki/Perf

Usage looks quite straight forware with no particular tips ...

Can you share one of your capture sample ?

Thx

Olivier