RE: Zephyr benchmark in NRF5340DK

Hieu — Wed, 10 Jul 2024 13:34:30 GMT

I looked into the sample, and it looks like the sample is running correctly.

The issue is that the sample is designed to timestamp how many cycles there are between scheduling events.
On the nRF5340 (and nRF52s), this cycle count is sourced from RTC1, which runs at 32768Hz. This resolution is not enough to capture meaningful data for something as fast as the scheduler.

I cannot comment about the other MCU you tested with, and I don't know your goal for this evaluation. However, I assume you want to have a meaningful comparison. For that you will need to reimplement the application so that the timestamps are based on something more universal, such as microseconds.

On the nRF5340, you could set up a TIMER peripheral at maximum speed (16MHz) for this purpose. Again, I cannot comment for the other MCU.

RE: Zephyr benchmark in NRF5340DK

Victor Lima de Souza — Tue, 09 Jul 2024 19:06:00 GMT

Ok. Much obliged.

RE: Zephyr benchmark in NRF5340DK

Hieu — Tue, 09 Jul 2024 19:03:03 GMT

Hi Victor Lima,

I will need some time to investigate this. I will follow up with you by the end of this week.

Hieu