Network test with iperf3: Start-like versus Power-like

Topics about Proxmox 9, KVM virtualisation, host layout and practical notes for VPS environments.
rychy
Site Admin
Мнения: 132
Регистриран на: Вто Окт 20, 2026 10:45 am

Network test with iperf3: Start-like versus Power-like

Мнение от rychy »

🇧🇬 Прочети на български

To complete the benchmark set after the storage and CPU/RAM tests, we also ran a real iperf3 test between two temporary LXC clones of the VPS profiles. The goal here is not a marketing number, but to see what the internal network shows between two instances under parallel traffic.

Test environment

  • Start-like: 2 vCPU, 4 GB RAM
  • Power-like: 4 vCPU, 8 GB RAM
  • iperf3 with 4 parallel streams for 10 seconds
  • both directions were measured, not just one

Results

Код: Избери целия код

Direction                         Aggregate throughput   Retr
---------------------------------------------------------------
Power-like -> Start-like          ~30.3-30.5 Gbit/s      0
Start-like -> Power-like          ~18.8 Gbit/s           0

What this shows

  • there are no retransmits in either direction, which is a good sign of stability
  • the internal network shows high throughput between the instances
  • there is a visible asymmetry between the two directions, so it would not be fair to publish only the stronger result
  • this kind of test is useful for backup, replication, internal traffic between services and storage-heavy scenarios

Practical conclusion

  • a disk benchmark alone is not enough if the workload also has heavier internal traffic
  • CPU, RAM, storage and network together give a more realistic picture of a VPS profile
  • the asymmetric result is useful because it shows real behaviour, not a smoothed-out marketing benchmark

For the other results see also the topics Comparing the storage pools in Proxmox, Comparison table: Start vs Power vs Plus vs Micron and CPU and RAM comparison with sysbench: Start-like versus Power-like.