netperf doesn't achieve expected bandwidth even to localhost

Issue

• netperf doesn't achieve expected bandwidth even to localhost
• When netperf is run between identical systems with 40Gb interfaces, a limit of 20 Gb/s is observed in transfer speeds.
• The issue can also be observed when running netperf via the loopback interface using the IP 127.0.0.1.
• Network bandwidth tests capped at 20 to 25 gigabit per second