I have tested this patch using a bhyve VM as the netdump client, and the vm host as the server.
Without the patch I see an average of 8.4043 Gbps (8153 MB in 7.760788 seconds)
With the patch: 7.247707 Gbps (8153 MB in 8.999260 s)
I still need to test with real hardware, especially on 10G and 100G cards