RHEL7: tuned low latency setting affects iperf3 performance

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Issue

Even after upgrading to a kernel with these fixes: https://access.redhat.com/solutions/2918251 performance is very inconsistent and throughput degraded.
Specifically throughput is degraded when more than one TCP stream is operational.

Environment

Red Hat Enterprise 7
Ixgbe (other NICs may also be affected)

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