Hello Steffen, I observed the same behaviour with our IXXAT devices but only on Ubuntu 18.04 so far. Here is the regarding known issues section from our release notes: On Ubuntu 18.04 LTS sending can messages on high busload leads to message loss. Also we never get ENOBUFS regardless how much can messages are sent. Tested with: sudo ip link set can0 up type can bitrate 1000000 sudo ip link set txqueuelen 10 dev can0 cangen -g 0 -Ii -L8 -Di -n 1000 -i -x can0 This behaviour seems to ocurr only on Ubuntu 18.04 regardless of installed kernel version. This was also tested with a self compiled 4.17.0 kernel on both Ubuntu 18.04.1 LTS and Ubuntu 16.04.5 LTS (On Ubuntu 16.04 everything seems fine). The behaviour was also observed with a PEAK usb controller (and it's socketcan driver). Kind regards, Florian
