Dell PowerSwitch S4128F-ON EMC SmartFabric OS10 User Guide Release 10.5.0 - Page 1163
Con ingress buffer
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Configure ingress buffer By default, all traffic classes map to the default priority group (PG) 7 for ingress buffers. The buffer reservation is based on the default priority group ID 7. All buffers are part of the default pool and all ports share buffers from the default pool. When you configure a network qos policy map, a new priority group is created for which buffers are assigned from the lossless pool. The rest of the traffic classes that are not mapped to any PFC-related PGs, use the default buffer. The reserved buffer size is 9360 bytes for the speed of 10G, 25G, 40G, 50G, and 100G. The supported speed varies for different platforms. Table 119. Maximum buffer size Platforms S4000 S6010-ON, S4048-ON S4100-ON Series S4200-ON Series S5200-ON Series Z9100-ON Z9264F-ON Max buffer size 12 MB 16 MB 12 MB 6 GB 32 MB 16 MB 42 MB The following table lists the values allocated for the default ingress buffers on the S4100-ON series platform. These values may differ for different platforms and speeds. Use the show qos ingress buffers command to view the default ingress buffers on your switch. Table 120. Default ingress buffers on the S4100-ON series platform Speed 10G 25G 40G 50G 100G Reserved buffers for 9KB 9KB 9KB 9KB 9KB PG 7 (default) The following lists the link-level flow control (LLFC) buffer settings for default priority group 7: Table 121. Default setting for LLFC Speed Default reserved buffer 10G 25G 40G 9KB 9KB 18KB Default Xon threshold 36KB 45KB 75KB Default Xoff threshold 9KB 9KB 9KB Default dynamic shared buffer threshold (alpha 9KB 9KB 9KB value) 50G 18KB 91KB 9KB 9KB 100G 36KB 142KB 9KB 9KB NOTE: The supported speed varies for different platforms. After the reserved buffers are used, each LLFC starts consuming shared buffers from the lossless pool with the alpha value determining the threshold except for the S4200ON series platform. The following table lists the priority flow control (PFC) buffer settings per PFC priority group: Table 122. Default settings for PFC Speed Default reserved buffer for S4000, S4048-ON, S6010-ON 10G 25G 40G 50G 100G 9KB NA 9KB NA NA Default reserved buffer for S41xx, Z9100-ON 9KB 9KB 18KB 18KB 36KB Default Xoff threshold 36KB 45KB 75KB 91KB 142KB Default Xon threshold 9KB 9KB 9KB 9KB 9KB Quality of service 1163
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