Dropped Pakets UC Egress queues on ICX7850 Stack

[Darky]

Good Morning Community,

i have a problem with dropping pakets in the UC Egress queues.

Traffic comes in with 25GB and goes out with 10GB.

I think that could be the reason for queuse overun (traffic comes only burst (iscsi)) not fully load.

Is there any recommended tununig option to increase the buffer for that queues or is there a other solution available?

Thanks for helping

[MariaC862]

Hello!

Thank you for your post, I think this might help you:

To mitigate the packet drops during this event, change the egress buffer in the port for Queue 0 to use more of the available buffer in the Sharing Pool.
 
To change the Egress buffer in the 40G port to use more of the available buffer in the Sharing Pool, use the following commands:
 
         qos egress-buffer-profile

queue-share-level level queue-number

 The default share level for Queue 0 is level4-1/9.
 
For Example:

(config)#qos egress-buffer-profile 40G-Port queue-share-level level5-1/5 0 --------> In profile 40G-Port use 1/5 of the available sharing buffer in queue 0

(config)#interface ethernet 1/2/1

(config-if-e40000-1/2/1)#egress-buffer-profile 40G-Port  ---------->  Apply it in the port having the drop
 
(config-if-e40000-1/2/1)#sho qos egress-buffer-profile 40G-Port -------> To check that it has been applied
Egress Buffer Profile: 40G-Port
Ports attached:
  1/2/1
Per Queue Details:       Share Level:
Queue 0                  level5-1/5
Queue 1                  level3-1/16
Queue 2                  level3-1/16
Queue 3                  level3-1/16
Queue 4                  level3-1/16
Queue 5                  level3-1/16
Queue 6                  level3-1/16
Queue 7                  level3-1/16

Detach Egress buffer profile

We must configure the 'no egress-buffer-profile' command to detach a profile from any ports that are using it before we can configure the 'no qos egress-buffer-profile' command to delete it.

The following example detaches the egress buffer profile named port-40G from port 1/2/1 and then delete the profile.

Device(config)# interface ethernet 1/2/1
Device(config-mif-1/2/1)# no egress-buffer-profile port-40G
Device(config-mif-1/2/1)#exit
Device(config)# no qos egress-buffer-profile port-40G
 
Note: The above command is not supported in ICX7150

I hope that works!