Full network usage on a 1GBit NIC yet only 40-60 MB/s transfer speed observed
Full network usage on a 1GBit NIC yet only 40-60 MB/s transfer speed observed
Hi, I'm trying to understand what's happening with my server. I have a single 1GBit/s network card on my Windows machine and two additional 1GBit/s NICs on my Truenas Server. When connecting, I only see 40-60 MB/s from Windows to Truenas, and neither of the NICs is using high CPU resources. There are no storage or RAM bottlenecks, and Windows shows over 900 MBit/s, but my actual transfer speed is much lower. On a laptop, my normal PC achieves 100-110 MB/s easily. Do you encounter anything similar? Also, even if I swap out the quad card for a single 1GBit/s NIC, performance drops significantly. All connections go through the same 48-port switch, which should support over 90 GB/s, but all tests with that setup failed. Let me know if this has happened before.
Could the network configuration be incorrect? It might not be set to the optimal choice.
Are you checking for excessive packet drops due to retries? iperf3 outputs metrics showing traffic usage and retry attempts. It helps monitor network performance and overhead during testing.
All IPv4 settings were automatically reinitialized without changes. For a full reset of a network interface, consider using command-line tools or system settings directly.
Avoid writing a full Iperf3 guide. Check tutorial sites or videos for help. This platform supports Windows Iperf3.