I am currently investigating a weird performance issue with MPRQ. I have tested both DPDK 21.11 and 23.11, and it seems they both see the same issue. This is with a 100G ConnectX-6 NIC.
We test three scenarios:
- We don’t get any drops when receiving 80Mpps of small V4 packets
- Same when receiving 80Mpps of small V6 packets (slightly larger than V4, crossing the 64 barrier).
- When receiving 40Mpps V4 and 40Mpps V6, we drop heavily (more than 50Mpps drops).
Without MPRQ, there are no drops in any of these 3 scenarios.
We are using MPRQ with a log stride size of 7 and a log stride num of 11. I have tested a few combinations and did not see significant differences.
Is that something normal? Is MPRQ only optimized for the case where we always receive the same packet size?