Dell S4148U-ON OS10 Enterprise Edition User Guide Release 10.4.0E R2 - Page 562

Platforms S4000 S6010-ON, S4048-ON S41xx Z9100-ON Max buffer size 12 Mb 16 Mb 12 Mb 16 Mb Link-level flow control (LLFC) default settings The following table lists the LLFC buffer settings for the default priority group 7. Speed Default reserved buffer Default Xoff threshold Default Xon threshold 10G 45Kb 36Kb 9Kb 25G 45Kb 36Kb 9Kb 40G 111Kb 75Kb 36Kb 50G 111Kb 75Kb 36Kb 100G 111Kb 75Kb 36Kb Priority flow control (PFC) default settings The following table lists the PFC buffer settings per PFC priority group. Speed Default reserved buffer for S4000, S4048-ON, S6010-ON Default reserved buffer for S41xx, Z9100-ON Default Xoff threshold Default Xon threshold Default dynamic share buffer threshold(alpha value) 10G 9Kb 9Kb 36Kb 9Kb 9Kb 25G NA 9Kb 45Kb 9Kb 9Kb 40G 9Kb 18Kb 75Kb 9Kb 9Kb 50G NA 18Kb 91Kb 9Kb 9Kb 100G NA 36Kb 142Kb 9Kb 9Kb NOTE: The supported speed varies for different platforms. After the reserved buffers are utilized, each PFC starts consuming shared buffers from the lossless pool with the threshold determined by the alpha value. Configure priority group buffer settings You can override the default priority group settings when LLFC or PFC is enabled. 1 Create network-qos type class-map to match the traffic classes. For LLFC match all the traffic classes(0-7) and for PFC, match the required traffic class. OS10(config)# class-map type network-qos tc OS10 (config-cmap-nqos)# match qos-group 0-7 2 Create network-qos type policy-map to define the actions for traffic classes, like buffer configuration and thresholds. OS10(config)# policy-map type network-qos buffer OS10(config-pmap-network-qos)# class tc OS10 (config-pmap-c-nqos)# pause buffer-size 300 pause-threshold 200 resume-threshold 100 OS10 (config-pmap-c-nqos)# queue-limit thresh-mode dynamic 5 Configure egress buffer Default settings All port queues are allocated with reserved buffers and when the reserved buffers are consumed, each queue starts using the shared buffer from the default pool. 562 Quality of service