Dell PowerSwitch S4112F-ON EMC SmartFabric OS10 User Guide Release 10.5.0 - Page 1164

Table 122. Default settings for PFC (continued) Speed Default dynamic share buffer threshold (alpha value) 10G 25G 40G 50G 100G 9KB 9KB 9KB 9KB 9KB NOTE: The supported speed varies for different platforms. After the reserved buffers are used, each PFC starts consuming shared buffers from the lossless pool with the alpha value determining the threshold. You can override the default priority group settings when you enable LLFC or PFC. 1. Create a network-qos type class-map to match the traffic classes. For LLFC, match all the traffic classes from 0 to 7. For PFC, match the required traffic class. OS10(config)# class-map type network-qos example-cmap-in-buffer OS10 (config-cmap-nqos)# match qos-group 0-7 2. Create network-qos type policy-map to define the actions for traffic classes, such as a buffer configuration and threshold. OS10(config)# policy-map type network-qos example-pmap-in-buffer OS10(config-pmap-network-qos)# class example-cmap-in-buffer 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 All port queues are allocated with reserved buffers. When the reserved buffers are consumed, each queue starts using the shared buffers from the default pool. The following table lists the values allocated for the default egress buffers on the S4100-ON series platform. These values may differ for different platforms and speeds. Use the show qos egress buffers command to view the default egress buffers on your switch. Table 123. Default egress buffers on the S4100-ON series platform Speed 10G 25G 40G Reserved buffers for 1664 bytes each queue of a port (default) 1664 bytes 1664 bytes 50G 1664 bytes 100G 1664 bytes The default dynamic shared buffer threshold is 8. 1. Create a queuing type class-map to match the queue. OS10(config)# class-map type queuing example-cmap-eg-buffer OS10(config-cmap-queuing)# match queue 1 2. Create a queuing type policy-map to define the actions for queues, such as a buffer configuration and threshold. OS10(config)# policy-map type queuing example-pmap-eg-buffer OS10(config-pmap-queuing)# class example-cmap-eg-buffer OS10(config-pmap-c-que)# queue-limit queue-len 200 thresh-mode dynamic 5 Deep Buffer mode NOTE: This feature is supported only on the S4200-ON series. OS10 provides the flexibility to configure the buffer mode based on your system requirements. The S4200-ON series switch comes with a default deep buffer size of 4.63 GB. You can use the hardware deep-buffer-mode command to enhance the deep buffer size to 6.24 GB. For information about how to configure deep buffer mode, see Configure Deep Buffer mode. The following lists the total buffer availability in the different modes: 1164 Quality of service