Generic RSS is not enabled on Cisco VIC

Products

• VMware vSphere ESXi

Issue/Introduction

• You are trying to enable Generic RSS on Cisco VIC
• vsish on ESXi shows that fetaures are not enabled and the rss engines supported is 0.
  
/net/pNics/vmnic6/rxqueues/> cat /net/pNics/vmnicX/rxqueues/info
rx queues info {
   # queues supported:1
   # rss engines supported:0 --> No RSS support on hardware
   # filters supported:0
   # active filters:0
   # filters moved by load balancer:0
   RX filter classes: 0x5 -> MAC VLAN_MAC
   Rx Queue features: 0 -> NONE --> Generic RSS is not enabled
   Support restart queues:0


• Tweaking the RSS settings from ESXi driver side doesn't make any difference. Setting parameter multi_tx_rss to 0 or 1 makes no difference in the features.
  
  For example:
  
  esxcli system module parameters set -m nenic -p multi_tx_rss="1"
  
  

Environment

VMware ESXi

Cause

RSS is not enabled from the firmware/hardware side.

Resolution

The RSS as a feature should be allowed from the UCS manager or the host administrative console. The adapter policy allows you to define the number of queues for transmit and receive traffic on a per-vNIC basis.

Additional Information

Please get in touch with Cisco to configure the features and Queues as required. For more information, read Tunable eNIC parameters.