Parking cores is a feature that allows the BIOS or Windows decides not to run all of the cores in a system, usually for power, performance, or cooling reasons.  Parking cores can impact Avanti performance, as it overrides Avanti's affinity requests.  Ensure that there are no BIOS or Power Manager settings reducing power to the CPUs or forcing Turbo Boost mode to be enabled if maximum Avanti performance is desired.