How to interpret perf reporting tool

Hi,

I would like to understand how to interpret perf tool output such as
reporting output etc.

Specifically, I would like to understand how to understand the following output I got from running my program

M sched:sched_switch

                  ?
633K sched:sched_stat_wait                                                 
                   ?
620K sched:sched_stat_sleep                                                
                   ?
2K sched:sched_stat_iowait                                                 
                   ?
648K sched:sched_stat_runtime                                              
                   ?
72 sched:sched_process_fork                                                
                   ?
623K sched:sched_wakeup                                                    
                   ?
4K sched:sched_migrate_task                                                
                   ?
                                                                           
                   ?

My problem is, I see the ipc I am using takes long time but during this capture the cpu idle time has been 98%. So I am wondering where have I gone wrong?

Thank you,
Srinath