Supermicro SSE-G2252 User Manual page 245

CLI References
See "queue mode" on page 36-2
reference information.
Command Usage
• Strict priority requires all traffic in a higher priority queue to be processed before
lower priority queues are serviced.
• WRR queuing specifies a relative weight for each queue. WRR 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.
• If Strict and WRR mode is selected, a combination of strict and weighted service is
used as specified for each queue. Regardless of the selected mode, the queues are
processed sequentially from high to lower priority (i.e., queues 3 to 0). The queues
assigned to use strict priority should be specified using the Strict Mode field
parameter.
• A weight can be assigned to each of the weighted queues (and thereby to 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.
• Service time is shared at the egress ports by defining scheduling weights for WRR,
or the queuing mode that uses a combination of strict and weighted queuing.
Service time is allocated to each queue by calculating a precise number of bytes per
second that will be serviced on each round.
• The specified queue mode applies to all interfaces.
Parameters
These parameters are displayed in the web interface:
• Queue Mode
• Strict – Services the egress queues in sequential order, transmitting all traffic in
the higher priority queues before servicing lower priority queues. This ensures
that the highest priority packets are always serviced first, ahead of all other
traffic.
• WRR – Weighted Round-Robin shares bandwidth at the egress ports by using
scheduling weights, servicing each queue in a round-robin fashion.
• Strict and WRR – Uses strict or weighted service as specified for each queue.
(This is the default setting.)
• Queue ID – The ID of the priority queue. (Range: 0-3)
and "show queue mode" on page 36-6
11-3
Chapter 11: Class of Service
for CLI