Right. We instruct Kernel to reserve 8 CPU cores exclusively for our user space application that is responsible for traffic forwarding.

Here's performance results. Max latency is 0.31 msec.

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min_latency_ns: 708

avg_latency_ns: 63723

max_latency_ns: 310795

jitter_ns: 30940

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Regarding L3 PFC support. In my understanding it's a ROCE requirement. I view RoCE as east-west traffic, since its not leaving the boundaries of the switch fabric, I think non-blocking leaf/spine fabric should be sufficient there. Please correct me if'm missing something.

SoftGate, the Linux router where we use DPDK, is designed for North/South traffic, sitting on the border of the data center, so we don't expect RoCE traffic there, but again, please let me know if you see it differently.