The CPU usage for the Test environment showed essentially all the usage on a single CPU (per server) and 0% usage on the all other CPUs for each Apache/Drupal webserver.
In production, there was also an imbalance observed, but while one CPU was at ~70% the others were around 15%.
Is their a way to insure that the load is close to evenly divided between the CPU's within each Apache/Drupal webserver?