Dell PowerConnect B-FCXs Configuration Manual page 648

17
Scheduling
TABLE 103
Queue
qosp7
qosp6
qosp5
qosp4
qosp3
qosp2
qosp1
qosp0
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.
PowerConnect(config)#qos profile qosp7 25 qosp6 15 qosp5 12 qosp4 12 qosp3 10
qosp2 10 qosp1 10 qosp0 6
Profile qosp7
Profile qosp6
Profile qosp5
Profile qosp4
Profile qosp3
Profile qosp2
Profile qosp1
Profile qosp0
Syntax: [no] qos profile <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.
606
Default minimum bandwidth percentages on Dell PowerConnect devices
Default minimum percentage of bandwidth
Without jumbo frames
75%
7%
3%
3%
3%
3%
3%
3%
: Priority7
: Priority6
: Priority5
: Priority4
: Priority3
: Priority2
: Priority1
: Priority0
<queue> <percentage> <queue> <percentage> <queue> <percentage> <queue>
<percentage> <queue> <percentage>
With jumbo frames
44%
8%
8%
8%
8%
8%
8%
8%
bandwidth requested
bandwidth requested
bandwidth requested
bandwidth requested
bandwidth requested
bandwidth requested
bandwidth requested
bandwidth requested
PowerConnect B-Series FCX Configuration Guide
25% calculated 25%
15% calculated 15%
12% calculated 12%
12% calculated 12%
10% calculated 10%
10% calculated 10%
10% calculated 10%
6% calculated 6%
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