ASUS XG-C100F speed issues

[Pau Estalella]

My little TrueNAS SCALE server (TrueNAS-SCALE-22.02.2.1)

Intel Core i5-10400
G.Skill AEGIS DDR4-3200 C16 DC - 32GB
GIGABYTE B560M DS3H motherboard
WD Red SN700 SSD - 250GB
Toshiba N300 NAS HDWG460UZSVA
250 GB SSD as boot drive

Connected to a Mikrotik CRS328-24P-4S+ router with a DAC cable.

I bought a ASUS XG-C100F 10 Gb Adapter and installed it on the PCIe x16 slot. I tested its speed using iperf3, and got very curious results. Sending from a PC with a 2.5 Gbps adapter to the TrueNAS SCALE server iperf3 reports the expected 2.5 Gbps. Sending from the TrueNAS SCALE server to the PC iperf3 reports around 360 Mbps. Using "iperf3 -c <pc-address> -P 16" makes the aggregate transfer speed climb to 440 Mbps.

Any guesses on where the problem could be? Driver, network adapter, cable?

Thanks!

 

[Pau Estalella]

Oh, there's this: https://www.truenas.com/community/t...-10gbe-card-limited-to-300-mb-s-upload.96105/
And yes, I'm using an adapter with the same Realtek RTL8156B chip. GRMPH.

 

[diogen]

Networking hardware (above 1Gbps) is not commodity.
On server-class OSs/appliances - e.g. TrueNAS - even the 1Gbps hardware is not all supported.
Just look at the vSphere hypervisor (ESXi) and how it dumped most of the Realtek NICs in the last few releases.
Not even all Intel NICs are supported...

You want to get guaranteed sticker performance - stay with the recommended hardware: mobos, NICs, HBAs, etc.
You feel adventurous - try other combinations (and share your experience)...