In this document Cisco TAC engineer " Varun Ajmani" has explained about High CPU issue on Cisco Wireless Services Module
Cisco Wireless Services Module (WS-SVC-WISM)
Process are up to 100% CPU usage is up 80-100% with no connection. only one controller is being affected
One of the WISM1 controllers (running 188.8.131.52) shows CPU usage as 100%
Upgraded the controller to 184.108.40.206, but same results. Debug from 6500 showed that CPU was high on 6500 switch as well, It was because of SNMP.
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
398 30028490483930864471 763 61.63% 75.12% 64.93% 0 SNMP ENGINE
Disabled SNMP on 6500 and WISM1, which helped bring down CPU% on WISM1.
Both Cisco Wireless Control System (WCS) and Cisco Network Convergence System (NCS) were added on WISM1.