Nexus 92300YC 100GE port tested by spirent tester only have 99.999% line rate

[ringline910]

User with Nexus 92300YC does  100GE  port  line rate test.

frame size 256/ 1500 

100%line rate      => continuing  drop packet.

99.9999% line rate => continuing  drop packet.

99.999% line rate  => no drop.

Is that the Nexus 92300YC limitation?

Nexus 92300YC  designs without enough buffers?

Any Configuration to achive 100% line rate?

Best Regards,
Michael