SG-3100 Less Throughput on tagged VLANs

lnguyen

I have been able to replicate this on four different SG-3100s, in four different locales, using 4 different ISPs providing Gigabit service. Not sure if this is a bug or the SG-3100 simply can't not forward tagged frames at 1Gbps throughput. When on the native/untagged default VLAN 1, the SG-3100 performs admirably. When placed on a port configured for a tagged VLAN, their is a noticeable loss of throughput. The numbers are consistent with speedtest or iperf3.

pfSense Version: 2.4.5-RELEASE-p1
WAN: mvneta2
VLAN1: mvneta1 (untagged)
VLAN101: VLAN 101 on mvneta1

Interfaces / Switch / Ports
Port # 2, Port VID 1

NUC8i7HVK operating under Ubuntu 20.04.1 LTS connected to LAN port 2 as Native/Untagged VLAN
hadescanyon:~$ speedtest

Speedtest by Ookla

 Server: Sprint - Austin, TX (id = 11208)
    ISP: AT&T Internet Services
Latency:     9.52 ms   (0.29 ms jitter)

Download: 930.75 Mbps (data used: 1.7 GB)
Upload: 888.38 Mbps (data used: 1.1 GB)
Packet Loss: 0.0%

NUC8i7HVK operating under Ubuntu 20.04.1 LTS connected to LAN port 2 on tagged VLAN101
hadescanyon:~$ speedtest

Speedtest by Ookla

 Server: Sprint - Austin, TX (id = 11208)
    ISP: AT&T Internet Services
Latency:     9.70 ms   (0.37 ms jitter)

Download: 867.54 Mbps (data used: 1.1 GB)
Upload: 768.37 Mbps (data used: 817.1 MB)