Dell PowerSwitch S4128F-ON OS10 Enterprise Edition User Guide Release 10.4.3.0 - Page 979

Buffer-usage accounting happens for ingress packets on ingress pools and egress packets on egress pool. You can configure ingress-packet buffer accounting per priority-group and egress-packet buffer accounting per queue level. Configure ingress buffer In default ingress buffers, all traffic classes map to the default priority group. The buffers are reserved per default priority group ID 7. All buffers are part of the default pool and all ports share buffers from the default pool. 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 64. Maximum buffer size Platforms S4000 S6010-ON, S4048-ON S4100-ON Series S4200-ON Series S5148F-ON S5200-ON Series Z9100-ON Z9264F-ON Max buffer size 12 MB 16 MB 12 MB 3 GB 16 MB 32 MB 16 MB 42 MB The following lists the link-level flow control (LLFC) buffer settings for default priority group 7: Table 65. Default setting for LLFC Speed Default reserved buffer Default Xon threshold Default Xoff threshold Default dynamic shared buffer threshold (alpha value) 10G 9KB 36KB 9KB 9KB 25G 9KB 45KB 9KB 9KB 40G 18KB 75KB 9KB 9KB 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 S4200-ON series and S5148F-ON platform. The following table lists the priority flow control (PFC) buffer settings per PFC priority group: Table 66. Default settings for PFC 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 Quality of service 979