CAN FD Bus Utilization Problem

[marckleinebudde]

• Firmware Information:

  1. Using Make_G431_Candle_Openlightlabs firmware; 2) System: Ubuntu 22.04.5 LTS; 3) Software application: SocketCAN; 4) External CAN FD Analyzer: ZLG USBCANFD 100U

• . Test Information:

  1. When SocketCAN is set to classic CAN ('sudo ip link set can0 type can bitrate 1000000'), and stressed tested using the command 'cangen can0 -L 8 -I 0x123 -g 0 -p 0', the external CAN FD analyzer shows a bus utilization of up to 98%. This is normal.
  2. However, when SocketCAN is set to CAN FD ('sudo ip link set can0 up type can bitrate 1000000 sample-point 0.8 dbitrate 5000000 dsample-point 0.75 fd on loopback off'), and stress tested with the same command 'cangen can0 -L 8 -I 0x123 -g 0 -p 0', the external CAN FD analyzer shows a bus utilization of only 49%, which seems abnormal.

Originally posted by @zhangyizhong16-glitch in #14

[marckleinebudde]

This is a limitation by the Linux kernel driver. I'm working on improving the performance.

Originally posted by @marckleinebudde in #14