Multiple Queues Statistics Do Not Indicate Any Traffic on a VMXNET3 Adapter That Has vSphere DirectPath I/O with vMotion Enabled

Products

• VMware vCenter Server
• VMware vSphere ESXi

Issue/Introduction

On a Linux virtual machine on a Cisco UCS host that uses Cisco Palo converged network adapters, when you run the ethtool –S ethX console command to obtain statistics about the traffic through a VMXNET3 adapter that has vSphere DirectPath I/O with vMotion enabled and is configured with multiple transmit queues (TQs) and receive (RQs) queues, the statistics remain unchanged for queues other than TQ 0 and RQ 0. X in ethX stands for the sequence number of the interface that is dedicated to the VMXNET3 adapter in the guest operating system.

Environment

VMware vSphere ESXi 5.0
VMware vCenter Server 5.0.x
VMware vCenter Server 5.1.x
VMware vSphere ESXi 5.5
VMware vSphere ESXi 5.1
VMware vCenter Server 5.5.x

Resolution

The problem appears because the Cisco Palo converged network adapter does not support multiple queues. Statistics about these TQs and RQs are added to the statistics about TQ 0 and RQ 0.

Resolve this issue in either of the following ways:

• In the UCS Manager, navigate to the port profile that that is associated with the VMXNET3 adapter and under Host Network IO Performance disable High Performance. See Cisco UCS B-Series Servers documentation.
• Configure only one TQ and RQ for the VMXNET3 adapter. See VMXNET3 resource considerations on a Linux virtual machine that has vSphere DirectPath I/O with vMotion enabled (2058349).

 

For translated versions of this article, see:

日本語 : "vSphere DirectPath I/O with vMotion" 機能を有効化した VMXNET3 アダプタでは、2 つ目以降のキュー統計にトラフィックが全く表示されない (2086872)