SMC Networks SMCGS10C-SMART Management Manual page 176

| Configuring the Switch
C 4
HAPTER
Quality of Service
processed before the lower priority queues are serviced, or Deficit
Weighted Round-Robin (DWRR) queuing which specifies a scheduling
weight for each queue. (Options: Strict, Weighted; Default: Strict)
DWRR services the queues in a manner similar to WRR, but the next
queue is serviced only when the queue's Deficit Counter becomes
smaller than the packet size to be transmitted.
Note that weighted scheduling uses a combination of weighted service
for queues 0 - 6, and strict service for the high priority queues 7 and 8.
Queue Shaper – Controls whether queue shaping is enabled for this
◆
queue on this port.
Enable – Enables or disables queue shaping. (Default: Disabled)
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Rate – Controls the rate for the queue shaper. The default value is
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500. This value is restricted to 100-1000000 kbps, or 1-3300 Mbps.
Unit – Controls the unit of measure for the queue shaper rate as
■
"kbps" or "Mbps." (Default: kbps)
Excess – Controls whether the queue is allowed to use excess
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bandwidth. (Default: Disabled)
Queue Scheduler – When the Scheduler Mode is set to Weighted, you
◆
need to specify a relative weight for each queue. DWRR uses a
predefined relative weight for each queue that determines the
percentage of service time the switch services each queue before
moving on to the next queue. This prevents the head-of-line blocking
that can occur with strict priority queuing.
Weight – A weight assigned to each of the queues (and thereby to
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the corresponding traffic priorities). This weight sets the frequency
at which each queue is polled for service, and subsequently affects
the response time for software applications assigned a specific
priority value. (Range: 1-100; Default: 17)
Percent – The weight as a percentage for this queue.
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◆ Port Shaper – Sets the rate at which traffic can egress this queue.
Enable – Enables or disables port shaping. (Default: Disabled)
■
Rate – Controls the rate for the port shaper. The default value is
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500. This value is restricted to 100-1000000 kbps, or 1-3300 Mbps
Unit – Controls the unit of measure for the port shaper rate as
■
"kbps" or "Mbps." (Default: kbps)
W I
EB NTERFACE
To show an overview of the queue mode and weight used by egress ports:
Click Configuration, QoS, Port Scheduler.
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