Per Connection Queue (PCQ) is a queuing discipline that can be used to dynamically equalize or shape traffic for multiple users, using little administration (amzn.to/2NCFg2o). It is possible to divide PCQ scenarios into three major groups: equal bandwidth for a number of users, certain bandwidth equal distribution between users, unknown bandwidth equal distribution between users.
Mikrotik PCQ Bandwidth Management :
PCQ was introduced to optimize massive QoS systems, where most of the queues are exactly the same for different sub-streams. For example a sub-stream can be download or upload for one particular client (IP) or connection to server.
PCQ algorithm is very simple - at first it uses selected classifiers to distinguish one sub-stream from another, then applies individual FIFO queue size and limitation on every sub-stream, then groups all sub-streams together and applies global queue size and limitation.
PCQ parameters:
pcq-classifier (dst-address | dst-port | src-address | src-port; default: "") : selection of sub-stream identifiers
pcq-rate (number) : maximal available data rate of each sub-steam
pcq-limit (number) : queue size of single sub-stream (in KiB)
pcq-total-limit (number) : maximum amount of queued data in all sub-streams (in KiB)
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