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I see the about the same numbers. Ethtool -k on the non-DPDK VM nics show a lot of offloads that are not available on the DPDK VM nics. One of these is tcp segmentation offload, and with this I see packets of avg size ~60,000 bytes between VMs on the same host. Turn tso off (ethtool -K ens3 tso off), the packet size is ~1500 and the rate drops from about 17 to 2 Gbps.

It seems DPDK/vhostuser does not provide this offload, and the packet size is ~1500. But the packets per second is better.