can, m_can, tcan4x5x : big jitter between the packets by sending

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Hello,

my application continuously sends 64 bytes CANFD packets with 1MBit/s at the 10ms interval. I use tcan4450 on the RPI4 with 5.10.103 Kernel and raspbian. No other significant processes load the CPU.

When I monitor the traffic with a PCAN adapter on a Windows PC, I notice that the packets sometimes arrive with a delay of 5-9ms. But the next following packet arrive faster as 10ms. My desired interval of 10ms is kept at the jitter of +/- 9ms.

Running the App on only one CPU core using tasksel improve the jitter somewhat.

Am I the only one who observes such large jitter or is the m_can implementation at Perepherie (spi) not so fast from the throughput and is completely normal.

Maybe I should switch to 5.17 kernel? On 5.17 there are bulk read/write function for spi regmap.


Thanks and Best Regards,
Michael Anochin



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