Nortel DMS-100 Series Maintenance Manual page 70

1-54 Maintenance overview
Define real-time overload as a processor occupancy rate of 75% or
higher for a minimum amount of time. Calculation of percentages in the
XLCM is very real-time intensive. This method is not flexible. This
enhancement can result in premature reaction if the XLCM is not in
severe real-time trouble.
Monitor the amount of time the system takes to process specified key
maintenance requests at high levels. The amount cannot exceed 100%
occupancy because the XLCM must respond to these requests before the
CM times out, or enters overload. Benchmark the average time to
process these key requests. If this process takes longer than the
benchmarked average, assume real-time overload.
Monitor idle task activity and enter real-time overload if an idle task
does not run for a specified period of time.
Characterize the timer task slip counter at a high occupancy, but not at
100% occupancy. If the timer task slips at more than the normal high
occupancy rate, enter real-time overload.
Monitor the size of the set message queue. If the queue is a minimum of
40, the XLCM is near real-time overload.
Include large memory blocks (LMB) in the reduction of memory blocks
component to be effective for the recovery of real-time.
297–8351–550 Standard 04.01 August 1999