Congestion Control
A congestion control system typically monitors various factors like CPU occupancy, link occupancy and messaging delay. Based on these factors it takes a decision if the system is overloaded. If the system is overloaded, it initiates actions to reduce the load by asking front end processors to reject traffic. The throttling of traffic will reduce the load but it there will be a certain time delay before which the monitored variables like CPU and Link occupancy show downward trend. Congestion control systems are designed to take this into account by spacing out congestion control actions. If the system continues to be overloaded, subsequent congestion control actions can further increase the traffic throttling. If the traffic load is just right, the system maintains current traffic throttling actions. If the system gets under loaded, the traffic throttling is reduced.
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