D-Link DGS-6600 Series, Manual

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DGS-6604 m qos deficit-round-robin
CLI Reference Guide
507
qos deficit-round-robin
Use the qos command in interface configuration mode to enable the Deficit
Round Robin (DRR)/Weighted Round Robin (WRR) packet scheduling
mechanism. To restore the packet scheduling mechanism, use the default form
of this command.
qos {deficit-round-robin [ COS-QUEUE quantum WEIGHT ] |weight-round-robin [ COS-QUEUE
weight WEIGHT ]}
default qos
Default
Strict priority mode and DRR mode is disabled.
quantum WEIGHT : 1
wrr- WEIGHT : 1
Command Mode
Interface configuration
Usage Guideline
Only physical port interfaces are valid for this command.
The port CoS queue can be either strict priority mode, deficit round robin (DRR)
mode or Weight round robin (WRR) mode. The strict priority scheduler mode
provides strict priority access to the egress port across the transmit priority
queue from the highest priority index to the lowest. The purpose of the strict
priority scheduler is to provide lower latency service to the higher CoS classes of
traffic.
DRR operates by serving a mount of backlogged credits into the transmit queue
in round robin order. Initially, each queue sets its credit counter to a configurable
quantum value. Every time a packet from a CoS queue is sent, the size of the
packet is subtracted from the corresponding credit counter. When the credit
counter drops below 0, the queue is no longer serviced until its credits are
replenished.
Syntax Description
deficit-round-robin deficit-round-robin in interface configuration mode to enable the Deficit Round
Robin (DRR) packet scheduling mechanism
weight-round-robin weight-round-robin in interface configuration mode to enable the weighted
Round Robin (WRR) packet scheduling mechanism
COS-QUEUE The transmit priority queue; valid value is from 0 to 7.
quantum WEIGHT (Optional) Specifies the Deficit Round Robin (DRR) quantum weight from 0 to
255. The final quantum is 16Kbytes * WEIGHT. The number of zero stands for
strict priority mode.
weight WEIGHT (Optional) Specifies the WRR weight. The final weight is number of permitted
scheduling packets.Tthe range is 0 ~ 15 and the number of zero stands for strict
priority mode.