Credit-based flow control technique in a modular multiprocessor system
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United States of America Patent
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Issued Date -
Oct 10, 2002
app pub date -
Apr 9, 2001
filing date -
May 31, 2000
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A credit-based, flow control technique utilizes a plurality of counters to conserve resources of a switch fabric within a modular multiprocessor system while ensuring that transaction packets pending in virtual channel queues of the fabric efficiently progress through those resources. The multiprocessor system includes a plurality of nodes interconnected by the switch fabric that extends from a global input port of a node through a hierarchical switch to a global output port of the same or another node. The resources include shared buffers within the global ports and hierarchical switch. Each counter is associated with a virtual channel queue and the flow control technique uses the counters to essentially create the structure of the shared buffers.
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