Created attachment 1248287 [details]
Templates used to deploy overcloud

Description of problem:

We are facing an issue with sriov functionality in RH OSP 10. When we  configure 15 Virtual Functions on the compute node we are able to boot VM’s with VF attached to it.

But when we configure the same compute node with 32 VF’s we are not able to boot VM’s with VF attached

Output seen with nova show 
| fault                                | {"message": "Exceeded maximum number of retries. Exceeded max scheduling attempts 3 for instance 2fd03d1c-5152-499a-9fc8-8caaa3d346a7. Last exception: error dumping ens2f1 (3) interface: Message too long", "code": 500, "details": "  File \"/usr/lib/python2.7/site-packages/nova/conductor/manager.py\", line 492, in build_instances |



Version-Release number of selected component (if applicable):

RH OSP 10

How reproducible:

100% reproducible when the virtual function count is 32

Steps to Reproduce:
1. deploy the overcloud by setting virtual function count to 32
2. create a sriov port
neutron port-create pvt --binding:vnic-type direct 
3. boot a VM with the port created in the 2nd step

SRIOV nic model: Intel Corporation 82599ES 10-Gigabit 
  

Actual results:

Output seen with nova show 
| fault                                | {"message": "Exceeded maximum number of retries. Exceeded max scheduling attempts 3 for instance 2fd03d1c-5152-499a-9fc8-8caaa3d346a7. Last exception: error dumping ens2f1 (3) interface: Message too long", "code": 500, "details": "  File \"/usr/lib/python2.7/site-packages/nova/conductor/manager.py\", line 492, in build_instances |


Expected results:

VM should boot with a sriov nic attached

Additional info: