| The PF_RING library is now able to handle DNA adapters simply using the prefix dna: |
| before their name. Example "pfcount -i dna1". |
| |
| With DNA you can dramatically increase the packet capture and transmission speed as the |
| kernel layer is bypassed and applications can communicate directly with drivers. |
| |
| In order to exploit DNA, you need a DNA-aware driver. Currently three driver families |
| are currently available: |
| |
| 1 Gbit |
| - e1000e (RX and TX) |
| - igbe (RX and TX) |
| |
| 10 Gbit |
| - ixgbe (RX and TX) |
| |
| These drivers can be found in drivers/DNA. Please refer to drivers/DNA/README.DNA |
| for additional information about this matter. |
| |
| With both drivers you can achieve wire rate at any packet size. You can test RX |
| using the pfcount application, and TX using the pfsend application. |
| |
| IMPORTANT |
| --------- |
| |
| Note that in case of TX, the transmission speed is limited by the RX performance. This is |
| because when the receiver cannot keep-up with the capture speed, the ethernet NIC sends |
| ethernet PAUSE frames back to the sender to slow it down. If you want to ignore these frames |
| and thus send at full speed, you need to disable autonegotiation and ignore them |
| (ethtool -A eth? autoneg off rx off tx off). |
| |
| ------------------------- |
| Luca Deri <deri@ntop.org> |
