Saturate 10G interface CCR1036-8G-2SFP+

I have two CCR1036-8G-2SFP+ I need to prove that the SFP+ interface reaches close to 10Gbps, however, I type the following command but it only reaches 2.2Gbps

[admin@MikroTik] /tool> bandwidth-test 172.16.20.90 duration=120s direction=both local-udp-tx-size=64000 protocol=udp remote-udp-tx-size=64000 user=admin

The connection between the two devices is directly from the SFP+ of the first device to the SFP+ interface of the second device, it can be observed that the green LED is on indicating 10G connectivity.