VPP/FAQ

Frequently Asked Questions

Q: I'm using multiple vpp worker threads, yet only one of them is processing traffic. Why?

A: Hardware RSS hashing sends all traffic from a given flow to the same queue. Each queue is assigned to a single worker thread. Make sure that you're sending traffic from a reasonably large number of flows.

Q: Why do I see RX misses on an interface at a low data-rate?

A: Check to make sure that the Linux kernel isn't scheduling other work on the same core(s) as vpp. It just won't do for vpp to take a forced 10ms vacation in the middle of packet processing. Check out the vpp autoconfiguration tool.