Guaranteed rate port scheduler
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United States of America Patent
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Sep 23, 2014
Grant Date -
N/A
app pub date -
Jun 21, 2011
filing date -
Jun 21, 2011
priority date (Note) -
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Abstract
A guaranteed rate port scheduler (GRPS) is used for serving multiple destination ports simultaneously without under-runs, even if the total bandwidth of the ports is more than the bandwidth capability of the device. Certain network protocols, such as Ethernet, do not allow “gaps” (called under-runs) to occur between bits of a packet on the wire. If a network device is transmitting packets to several such ports at the same time and the combined bandwidth of these ports is more than the device can source, under-runs begin to occur within the transmitted packets. The disclosed GRPS solves this problem by: (a) the GRPS serves only as many destination ports at a given time as can be “handled”, and (b) the GRPS fairly selects new destination ports to serve after every end-of-frame data packet transmission by effectively “de-rating” the statistical bandwidth of each destination port in proportion to the diminished capacity of the device.
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