QoS (Quality of Service) Follow

1. Queue counter
2. CoS and Queue mapping
3. DSCP and Queue mapping (TBD)
4. QoS Scheduling (TBD)

Example: Queue Counter

Reference model:

• Switch model name: AS7816-64X
• Edgecore SONiC version: SONiC.Edgecore-SONiC_20200116_051623_ec201904_128

Procedure:

Steps 1. Clear the queue counter

admin@sonic:~$ sonic-clear queuecounters

Steps 2. Check Ethernet0 queue counter

admin@sonic:~$ show queue counters Ethernet0    
Last cached time was 2016-11-07 00:54:58.623429
     Port    TxQ    Counter/pkts    Counter/bytes    Drop/pkts    Drop/bytes
---------  -----  --------------  ---------------  -----------  ------------
Ethernet0    UC0               0                0            0             0
Ethernet0    UC1               0                0            0             0
Ethernet0    UC2               0                0            0             0
Ethernet0    UC3               0                0            0             0
Ethernet0    UC4               0                0            0             0
Ethernet0    UC5               0                0            0             0
Ethernet0    UC6               0                0            0             0
Ethernet0    UC7               0                0            0             0
Ethernet0    UC8             N/A              N/A          N/A           N/A
Ethernet0    UC9             N/A              N/A          N/A           N/A
Ethernet0   MC10               0                0            0             0
Ethernet0   MC11               0                0            0             0
Ethernet0   MC12               0                0            0             0
Ethernet0   MC13               0                0            0             0
Ethernet0   MC14               0                0            0             0
Ethernet0   MC15               0                0            0             0
Ethernet0   MC16               0                0            0             0
Ethernet0   MC17               0                0            0             0
Ethernet0   MC18             N/A              N/A          N/A           N/A
Ethernet0   MC19             N/A              N/A          N/A           N/A

Notes:

1. 8 dedicated queues (i.e UC0, UC1, ..., UC7) for unicast. 
2. Other 8 dedicated queues (i.e MC10, MC11, ..., UC17) for multicast.
3. UC8, UC9, UC18, UC19 are not available. 

Example: CoS and Queue mapping

Reference model:

• Switch model name: AS7816-64X
• Edgecore SONiC version: SONiC.Edgecore-SONiC_20200116_051623_ec201904_128

Known issue: 

AS7816-64X breakout cable doesn't support CoS mapping, no matter which CoS priority of packets you sent, they all belong to Queue 0.

Default setting:

1. Port priority is 0 by default.  i.g Untagged packet (without CoS priority) 
2. CoS and Queue mapping table