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606 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
Scheduling
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When the queuing method is weighted round robin, the software internally translates the
percentages into weights. The weight associated with each queue controls how many packets are
processed for the queue at a given stage of a cycle through the weighted round robin algorithm.
NOTE
Queue cycles on the PowerConnect devices are based on bytes. These devices service a given
number of bytes (based on the weight) in each queue cycle. FES and BI/FI queue cycles are based
on packets. The bytes-based scheme is more accurate than a packets-based scheme if packets vary
greatly in size.
The bandwidth allocated to each queue is based on the relative weights of the queues. You can
change the bandwidth percentages allocated to the queues by changing the queue weights.
There is no minimum bandwidth requirement for a given queue. For example, queue qosp3 is not
required to have at least 50% of the bandwidth.
To change the bandwidth percentages for the queues, enter commands such as the following.
Note that this example uses the default queue names.
Syntax: [no] qos profile <queue> <percentage> <queue> <percentage> <queue> <percentage>
<queue> <percentage> <queue> <percentage> <queue> <percentage> <queue>
<percentage> <queue> <percentage>
Each <queue> variable specifies the name of a queue. You can specify the queues in any order on
the command line, but you must specify each queue.
TABLE 103 Default minimum bandwidth percentages on Dell PowerConnect devices
Queue Default minimum percentage of bandwidth
Without jumbo frames With jumbo frames
qosp7 75% 44%
qosp6 7% 8%
qosp5 3% 8%
qosp4 3% 8%
qosp3 3% 8%
qosp2 3% 8%
qosp1 3% 8%
qosp0 3% 8%
PowerConnect(config)#qos profile qosp7 25 qosp6 15 qosp5 12 qosp4 12 qosp3 10
qosp2 10 qosp1 10 qosp0 6
Profile qosp7 : Priority7 bandwidth requested 25% calculated 25%
Profile qosp6 : Priority6 bandwidth requested 15% calculated 15%
Profile qosp5 : Priority5 bandwidth requested 12% calculated 12%
Profile qosp4 : Priority4 bandwidth requested 12% calculated 12%
Profile qosp3 : Priority3 bandwidth requested 10% calculated 10%
Profile qosp2 : Priority2 bandwidth requested 10% calculated 10%
Profile qosp1 : Priority1 bandwidth requested 10% calculated 10%
Profile qosp0 : Priority0 bandwidth requested 6% calculated 6%