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RTOS/AM4376: PRU-ICSS driver performance

Part Number: AM4376

Tool/software: TI-RTOS

We are trying to receive IEC61850 sampled values stream (~123 bytes long frames at 4kHz evenly distributed). Unfortunately, sometimes driver receive frames, sometimes keeps silence while data is present on the wire and RTOS is looping in the idle task. Is there any known performance/stability issue with PRU-ICSS under RTOS?