Two thor dev kits fiber communication rate can not reach 25G

Robotics & Edge Computing Jetson Systems Jetson Thor
1

I flash two thor kits using JetPack 7.1 with Jetson Linux 38.4 version, and connect two thor dev-kit mgbe0 with fiber cable.
I changed the bootloader dtb and kernel dtb according to “Enable 25 Gigabit Ethernet on QSFP Port” web guide.
Then, I test the mgbe0 speed using iperf3, and the speed is only 11G.

Later,I had even done the following steps:
mgbe threaded
echo 1 > /sys/devices/platform/bus@0/a808a10000.ethernet/net/mgbe0_0/threaded
echo 1 > /sys/devices/platform/bus@0/a808e10000.ethernet/net/mgbe3_0/threaded
echo 1 > /sys/devices/platform/bus@0/a808b10000.ethernet/net/mgbe1_0/threaded
echo 1 > /sys/devices/platform/bus@0/a808d10000.ethernet/net/mgbe2_0/threaded
After mgbe threaded, I can only get 12G speed rate.

Why did the mgbe0 fiber speed can not reach 25G speed?

2

The 25G is still an issue under fixing, will update you the status once got more results.

Sorry for that.

5

What’s Nvidia test 25G MGBE throught by two Thor-DevKit with 25G fibe QSFP interconnect ？

6

This test by QSFP28 AOC cable，the cable test report by vendor： BER ： E(-13)