VMXNET3 "Disable Rx queuing" messages appear in vmkernel.log

Products

• VMware vSphere ESXi

Issue/Introduction

In var/run/log/vmkernel.log, "Disable Rx queuing" messages are observed during Virtual Machine bootup or snapshot operations 
 

YYYY-MM-DDTHH:MM:SS.Z cpuxx:8640120)Vmxnet3: 17293: Disable Rx queuing; queue size 256 is larger than Vmxnet3RxQueueLimit limit of 64.
YYYY-MM-DDTHH:MM:SS.Z cpuxx:8640120)Vmxnet3: 17651: Using default queue delivery for vmxnet3 for port 0x7xxxxxxx.

Environment

VMware ESXi

Cause

• The message regarding "Disable Rx queuing" is related to PXE boot. 
• Whenever the VMXNET3 driver is being connected/re-connected to vSS/vDS ports (e.g. during guest OS non-PXE bootups, or snapshots), the 'Burst queueing" is disabled which causes the above messages to appear 

This message can be safely ignored. 

Resolution

• This is an expected behavior for normal VM boot operations. Refer to the article here --> Documentation on Vmxnet3 Rx Burst Queuing feature and how to configure it

Additional Information

If you are facing issues with the VM performance or connectivity, kindly open a case with Broadcom support --> Creating and managing Broadcom support request (SR) cases