Configuration Guide User guide

FastIron Configuration Guide 1989
53-1002494-02
Scheduling QoS information
Configuring the QoS queues
Each of the queues has the following configurable parameters:
• The queue name
• The minimum percentage of a port outbound bandwidth guaranteed to the queue
Renaming the queues
The default queue names are qosp7, qosp6, qosp5, qosp4, qosp3, qosp2, qosp1, and qosp0. You
can change one or more of the names if desired.
To rename queue “qosp3” to “92-octane”, enter the following command.
Brocade(config)#qos name qosp3 92-octane
Syntax: qos name <old-name> <new-name>
The <old-name> variable specifies the name of the queue before the change.
The <new-name> variable 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 priority 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.
NOTE
On the SX-FI48GPP interface module, the bandwidth percentages for 8 to 4 queue mapping for WRR
queues are different from other Brocade SX modules. For more information on 8 to 4 queue
mapping on the SX-FI48GPP interface module, refer to “Default scheduling configuration for the
SX-FI48GPP module” on page 1985.
By default, the eight QoS queues on FastIron devices receive the minimum guaranteed
percentages of a port’s total bandwidth, as shown in Table 347. Note that the defaults differ when
jumbo frames are enabled.
TABLE 347 Default minimum bandwidth percentages on Brocade 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%