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Which QoS hardware queues are low latency queues (LLQ) on EOS products

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TitleWhich QoS hardware queues are low latency queues (LLQ) on EOS products
Question
Which QoS hardware queues are Low Latency Queues (LLQs)?
Environment
  • EOS
  • S-Series
  • K-Series
  • 7100-Series
  • All Firmware
Answer
  • The LLQ assignment is dependent on the hardware present in the system.
  • The 'show cos port-config txq' command will display which hardware queues are LLQs. 

In the example below, queues 0,9-14 are Low Latency Queues:
 

S4 Chassis(su)->show cos port-config txq

 * Percentage/queue (if any) are approximations based on
   [(slices/queue) / total number of slices]

Transmit Queue Port Configuration Entries
----------------------------------------------------------------------
Port Group Name  :S-Series 11Q
Port Group       :0
Port Type        :0
Assigned Ports   :none
Arbiter Mode     :Low Latency Queue
Slices/queue     :Q [ 0]: LLQ  Q [ 1]:   0  Q [ 2]:   0  Q [ 3]:   0
                 :Q [ 4]:   0  Q [ 5]:   0  Q [ 6]:   0  Q [ 7]:   0
                 :Q [ 8]: 100  Q [ 9]: LLQ  Q [10]: LLQ
Percentage/queue :Q [ 0]: LLQ  Q [ 1]:   0% Q [ 2]:   0% Q [ 3]:   0%
                 :Q [ 4]:   0% Q [ 5]:   0% Q [ 6]:   0% Q [ 7]:   0%
                 :Q [ 8]: 100% Q [ 9]: LLQ  Q [10]: LLQ
----------------------------------------------------------------------
Port Group Name  :S-Series 15Q
Port Group       :0
Port Type        :1
Assigned Ports   :ge.3.1-48
Arbiter Mode     :Low Latency Queue
Slices/queue     :Q [ 0]: LLQ  Q [ 1]:   0  Q [ 2]:   0  Q [ 3]:   0
                 :Q [ 4]:   0  Q [ 5]:   0  Q [ 6]:   0  Q [ 7]:   0
                 :Q [ 8]: 100  Q [ 9]: LLQ  Q [10]: LLQ  Q [11]: LLQ
                 :Q [12]: LLQ  Q [13]: LLQ  Q [14]: LLQ
Percentage/queue :Q [ 0]: LLQ  Q [ 1]:   0% Q [ 2]:   0% Q [ 3]:   0%
                 :Q [ 4]:   0% Q [ 5]:   0% Q [ 6]:   0% Q [ 7]:   0%
                 :Q [ 8]: 100% Q [ 9]: LLQ  Q [10]: LLQ  Q [11]: LLQ
                 :Q [12]: LLQ  Q [13]: LLQ  Q [14]: LLQ
----------------------------------------------------------------------

 
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