Method and system for output flow control in network multiplexers
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United States of America Patent
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Dec 6, 2011
Grant Date -
Apr 29, 2004
app pub date -
Dec 8, 2003
filing date -
Nov 26, 1999
priority date (Note) -
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Abstract
A method and system for initiating selective flow control within a network multiplexer. Each port of a network multiplexer is associated with high and low threshold values, as well as a list of indications of ports that have requested the port to initiate flow control and a list of indications of ports which the port has requested to initiate flow control. A port that, by queuing a message descriptor to the transmit queue of a destination port, causes the number of message descriptors queued to the transmit queue of a destination port to equal or exceed its high threshold, is flow controlled by the destination port. When the number of message descriptors queued to the transmit queue of a destination port that previously equaled or exceeded the high threshold falls below the low threshold, all ports flow controlled by the destination ports are released from flow control.
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