Hello everyone, This is on "19.01", I've yet to test with 18.10. I've setup dynamic NAT. I've tested this with a clean setup without specifying anything special in startup.conf. The results are irrelevant of other NAT settings except NAT workers. I've tried specifying various networks, single IP as external network, or a larger subnet of /24 or /23, no difference. If I set VPP workers to no more than 4, I see no issues in throughput or latency, since then NAT workers are also limited to 4. However, if I specify workers at 5 or above, latency is high on every single packet processed, with averages of around 18 ms. Throughput is also severely affected, hitting around 100 Mbps from an external server to a NAT:ed client. If NAT workers are set to 4 or less, the issues go away.
Server has a single 12 core Xeon Gold CPU, 96GB DDR4 RAM in optimal placement using all memory channels, and interfaces are two Mellanox ConnectX-5 100GbE. I'm stumped, not seen this behaviour in the past or in anyone's experience. Suggestions?
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