GBASE-T transceivers performance with NBASE-T - Marvell 88x3300 v/s Aquantia AQS-107

[nereith]

I am having what seems to be the same issue. I am using 2 Wiitek SFP-10G-T-100 SFP+ modules plugged into an ICX-6610. The ICX-6610 sees 10G from its side of the SFP+ modules.

Given this setup:

Endpoint A (10G Negotiated) <-> Wiitek Module in Port 1(ICX6610) <-> Wiitek Module in Port 2 (ICX6610) <-> Endpoint B (2.5G Negotiated)

I am seeing that an iperf3 from B -> A yields ~ 2.27Gb/s, 0 Retransmits. Once I try going from A -> B I get ~ 1.78 Gbits/sec but 650 Retransmits. Upon first glance the issue here is this same as this thread: A is maybe sending at full 10G speeds and the packets are effectively being dropped because B can only take 2.5G and there is no flow control.

However, if I limit the bandwidth of my iperf3 test via -b 500M I still get retransmits when sending from A -> B. So maybe my issue isn't really flow control or oversaturation of the link on one end causing dropped packets?

I have used the exact same Wiitek module in my Mikrotik CCR2116's SFP+ WAN port connected to the 2.5G port of the ONT. Internet plan is 2.5G down + 1.25G up. Upload portion of speedtests occasionally causes loss of internet access despite SFP+ and ONT ports showing valid connection.

I don't see the same issue with the Aquantia AQS-107-CX-1 or Ubiquiti UACC-CM-RJ45-MG. The CCR2116 reports RX Pause frames for the Aquantia and Ubiquiti modules, but not for the Wiitek.