Why is the forwarding bandwidth of generic XDP much less than DPDK

[difficultwork]

I used gXDP to implement NAT function. Bandwidth testing on VM，gXDP is 1.6Gbit/s and DPDK is 5.9Gbit/s. (linux kernel version is 4.18)

But when I use gXDP on docker network, the bandwidth can reach 5.9Gbit/s.

Does gXDP depend on NIC configuration?

Plz help me.
Thx🙏

[lmb]

This doesn't seem to be related to using the ebpf library, so I'll have to close this discussion, sorry.