After some research I have found that the kernel's default "qdisc pfifo_fast" is used (or more likely not set).
It uses it for both the ETH interface of A20-LIME2 and the SocketCAN interface.
Setting "qdisc fq_codel" improved the ethernet link quality alot.
Setting "qdisc noqueue" for the CAN interface stopped it losing CAN frames.
After some research I have found that the kernel's default "qdisc pfifo_fast" is used (or more likely not set).
It uses it for both the ETH interface of A20-LIME2 and the SocketCAN interface.
Setting "qdisc fq_codel" improved the ethernet link quality alot.
Setting "qdisc noqueue" for the CAN interface stopped it losing CAN frames.