Root scheduling algorithm in a network processor
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United States of America Patent
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Nov 5, 2013
Grant Date -
Jan 26, 2012
app pub date -
Sep 30, 2011
filing date -
May 18, 2010
priority date (Note) -
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Abstract
Described embodiments provide for arbitrating between nodes of scheduling hierarchy of a network processor. A traffic manager generates a tree scheduling hierarchy having a root scheduler and N scheduler levels. The network processor generates tasks corresponding to received packets. The traffic manager queues the received task in an associated queue of the scheduling hierarchy. The root scheduler performs smooth deficit weighted round robin (SDWRR) arbitration between each child node of the root scheduler. The SDWRR arbitration includes checking one or more status indicators of each child node of the given scheduler and selecting, based on the status indicators, a first active child node of the scheduler and updating the one or more status indicators corresponding to the selected child node. Thus, a task is scheduled for transmission by the traffic manager every cycle of the network processor.
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