Configuring virtual server settings for improved network performance

IBM Cloud® Virtual Servers bandwidth is capped only if you select the 100 Mbps rate-limited uplink port speed during the provisioning process. If you select the 100 Mbps rate-limited uplink port speed during provisioning, the maximum virtual server instance throughput is limited only by the physical bandwidth available to the virtual server host. You can achieve higher network performance through extra configuration if you provision with the 1 Gbps non rate-limited uplink port speed.

If you select the 1 Gbps non rate-limited uplink port speed and want to achieve higher network performance, higher than 5 Gbps, consider enabling jumbo frames in the networking configuration of your virtual server instance.

In addition to configuring jumbo frames, the use of multiple TCP connections can also help you achieve higher network performance on your workloads. Support for multiple TCP connections is application-dependent, so you can refer to your application documentation to determine whether you can use multiple TCP connections.

Another configuration setting to consider that can impact network performance is the number of vCPUs in your virtual server instance. To achieve higher than 5 Gbps network throughput, you need to select a profile with more than 1 vCPU. You can experiment with several profiles with different numbers of vCPUs to determine which configuration best meets your network performance expectations.