Known Limitations

Maximal jumbo frames

The maximum supported frame length (MTU) for DMA Medusa is 16,332 bytes. DMA Calypte supports frames up to 4,096 bytes only. For proper MTU functionality during DMA transfers, you may need to configure the software buffer sizes using the nfb-dma tool. Also configure the MTU in the Ethernet MAC using the nfb-eth tool; the default value is 1,526 bytes.

DPDK settings

The DPDK native DMA drivers require the --iova-mode pa setting. This is set by default on most machines, but on some AMD systems it can cause issues, potentially leading to host system shutdown. The recommended way to run a DPDK application with DPDK native drivers is:

dpdk-testpmd --iova-mode pa -a 0000:17:00.0,queue_driver=native