The ISA show status command displays per ISA CPU utilization by main tasks, to provide insight into what aspects of load may be loading the ISA. These are split into 2 main areas:
management CPU
This includes all tasks related to communication between the CPM and the ISA, with the following usage percentage reported:
system (various infrastructure and overhead work)
management (managing AA policy, AA subscriber and trap configurations, and handling tools requests)
statistics (collecting and reporting statistics and Cflowd reporting)
idle
datapath CPUs
This includes all tasks related to datapath packet and flow processing on the ISA, with the following usage percentage reported:
system (various infrastructure and overhead work)
packet processing (receiving, associating with flows, applying application QoS policy, and transmitting)
application ID (using protocol signatures and other techniques to identify application/app-group and determine the application QoS policy)