Brocade TurboIron 24X Series Configuration Guide - Manual (Page 1081)

Brocade TurboIron 24X Series Configuration Guide 1047
53-1003053-01
Scheduling
Syntax: qos name <old-name> <new-name>
The <old-name> parameter specifies the name of the queue before the change.
The <new-name> parameter specifies the new name of the queue. You can specify an
alphanumeric string up to 32 characters long.
Changing the minimum bandwidth percentages of the WRR queues
If you are using the weighted round robin mechanism instead of the strict mechanism, you can
change the weights for each queue by changing the minimum percentage of bandwidth you want
each queue to guarantee for its traffic.
By default, the eight QoS queues on devices receive the following minimum guaranteed
percentages of a port total bandwidth. Note that the defaults differ when jumbo frames are
enabled.
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 devices are based on bytes. These devices service a given number of bytes
(based on the weight) in each queue cycle.
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.
Command syntax
To change the bandwidth percentages for the queues, enter commands such as the following.
Note that this example uses the default queue names.
TABLE 174 Default minimum bandwidth percentages on 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%