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Can you please let us know the following:
1. is 'qos_mode' enabled on SEA?
2. was IBM-i LPAR using VLANs and Priorities to VLANs?
3. was other LPARs are pushing traffic in parallel with IBM-I LPAR?
4. Did you see same issue on AIX or Linux LPARs? or was it specifically seen by IBM-i LPAR only?
5. May I know how you were able to generate traffic and calculate bandwidth - are you using iperf or netperf?
For more information on SEA QoS please refer this link - https://www.ibm.com/docs/en/power8?topic=networking-shared-ethernet-adapters
* SEA-Shared Ethernet Adapter