Hey folks,

We are troubleshooting a vendor application that is leveraging DPDK at the application layer.

Openstack with RHOSP / RHEL
OVS as the underlying virtual switching layer. The VM is not using SRIOV ports.
VM acts as a load balancer (traffic pattern in IN+OUT). Traffic arrives on a VLAN (provider network) and exits through a VXLAN network (internal) to be forwarded to application servers.
VMs are using pinned cores

4 cores total
2 for the OS
2 for DPDK : 1 TX one RX

Using hugepages
There are no other VMs on the physical compute.
compute is using isolated cores for the OS. No collision with the VM cores.

At low packet rates (20k~ PPS), it seems that the DPDK layer fails to transmit packets on the TX queue. This triggers a failover.

We are not seeing anything particularly obvious on the compute side. Is there anything at the DPDK layer that should be clear about why there is a failure to TX?

Thanks!