Seeing reduced throughput and pruning errors in 'netstat -s' after upgrading to RHEL 6.3 or later

Issue

• When using RHEL 6.2, we were able to achieve 459k messages per second for a 10 minute duration. Roughly 3.17% of the CPU
  was idle. This is on a HP G8 24 cpu machine with 32 gig of memory. We are using 11 NICs. When we upgraded to RHEL 6.4, the best we can do now is 275k message per second with 4.38% of the CPU idle.