Improving and increasing CPU utilization observed in some networking workloads for Mellanox (Cx-5) 100G NIC.
Article ID: 334939
Updated On:
Products
VMware vSphere ESXi
Issue/Introduction
Symptoms:
Increase in CPU utilization in some networking workloads (non-ENS).
Environment
VMware vSphere ESXi 8.0
Cause
nmlx5 driver increased default queue count to 24 to support higher throughput devices. While this helps to achieve pNic throughput improvements, it can also result in increased CPU utilization in some workloads.
Resolution
Load the driver with queue count to 16, to reduce the CPU utilization.
Workaround:
Load nmlx5 driver with below settings
esxcli system module parameters set -m nmlx5_core -p "max_queues=16 RSS=4 GEN_RSS=2"Feedback
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