Edge node VM resource usage and Data Plane Development Kit

The VMware NSX-T Data Center edge node VMs implement the Data Plane Development Kit (DPDK) standard to provide high-performance packet forwarding capabilities. 

The DPDK reserves CPU cores to constantly poll the NIC for packets instead of waiting for them to be processed using an interrupt. The constant polling produces the following performance on edge mode VM vCPUs:

  • Some of the vCPUs run at 50 percent of capacity under no load.
  • Some of the vCPUs run at 100 percent of capacity under moderate load.

There may be a high CPU utilization level on edge node VMs that are operating properly.