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1
Did you validate the ENA drive is enabled on the instance? https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/enhanced-networking-ena.html
You can also leverage CloudWatch metrics to see the NetworkIn to the instance to see how much throughput is being used. https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/monitoring-network-performance-ena.html
0
Network performance from a client to a server depends on a lot of things including the network in between. Could it be an issue on the server? Sure. But I would first look at the path between the client and server. Run tests on different clients connected to different networks and isolate where the performance issue is coming from.
ENA enabled yes. I configured alarms, is that boolean: ethtool_bw_in_allowance_exceeded > 0 for 1 datapoints within 5 minutes (did the same for the 5 of them). Does it makes sense?