I have VMs running on bare-metal instances. Each bare-metal instance is in a separate rack by design (for fault tolerance). The bandwidth is 25GbE however, the response time between the hosts is so high that I need multiple streams to consume that bandwidth.
Compared to my local on-prem lab I need many more streams to get the observed throughput close to the theoretical bandwidth of 25GbE
| # iperf Streams | AWS Throughput | On-Prem Throughput |
| 1 | 4.8 Gbit | 21.4 Gbit |
| 2 | 9 Gbit | 22 Gbit |
| 4 | 18 Gbit | 22.5 |
| 8 | 23 Gbit | 23 Gbit |