Manual:Queues - PCQ: Difference between revisions
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==Limit and Total Limit== | ==Limit and Total Limit== | ||
[[Image:PCQ3.png|700px|Classifiers]] | |||
[[Image:PCQ4.png|700px|Classifiers]] | |||
Revision as of 16:17, 4 December 2008
Usage
PCQ was introduce to optimize massive QoS systems where most of the queues was exactly the same only for different sub-streams. For example a sub-stream can be download or upload for one particular client (IP) of 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 (witch is exactly the same for every sub-stream), then group all sub-streams together and apply global FIFO 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 one sub-stream in packets
- pcq-total-limit (number) : queue size of global FIFO queue
So instead of having 100 queues with 1000kbps limitation for download we can have one PCQ queue with 100 sub-streams
Classifiers
Limit and Total Limit
