L4T: 38.2
Module: Jetson Thor T5000
Carrier Board: Y-C28

Issue: The actual bandwidth of the optical port is lower than 10 Gbps
Solution:

$sudo su
$echo 1 > /sys/devices/platform/bus@0/a808a10000.ethernet/net/mgbe0_0/threaded
$echo 1 > /sys/devices/platform/bus@0/a808b10000.ethernet/net/mgbe1_0/threaded

Forum reference: https://forums.developer.nvidia.com/t/jetson-agx-thor-25gbe-links-established-but-throughput-capped-at-10-gbps/347821/3