Dell S4810 Reference Manual page 577

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resume-offset

The default size of the ingress buffer is 45 KB. The default buffer limit at which the

port sends the pause to peer and recommences the sending of packets to the peer

is 10 KB. The default threshold weight of the shared buffer space is 10.

DCB-BUFFER-THRESHOLD mode

Version 9.3(0.0)

You must apply this buffer policy at the interface level for the attributes to be

applicable in conjunction with the DCB input policy.

For each QoS policy buffer, you can specify the shared buffer threshold limit, the

ingress buffer size, buffer limit for pausing the acceptance of packets, and the

buffer offset limit for resuming the acceptance of received packets. When PFC

detects congestion on a queue for a specified priority, it sends a pause frame for

the 802.1p priority traffic to the transmitting device.

You can use set up both the administrative and peer-related PFC priorities. For

example, you can configure the intended buffer configuration for all 8 priorities. If

you configure the number of lossless queues as 4 and if the administrator-

configured priorities configured within the DCB input policy is applied, then the

configuration for those priorities are pre-designed. However, if the peer-provided

priorities are applied, although a DCB input policy is present, the peer-provided

priorities become effective for buffer configuration. This method of configuration

provides an easy and flexible technique to accommodate both administratively-

configured and peer-configured priorities.

Data Center Bridging (DCB)

Ingress buffer size

Size of the ingress buffer in KB. Enter a number in the range

of 0 to 7787. The default is 45 KB.

Buffer limit for pause frames to be sent

Buffer limit at which the port sends the pause to peer in KB.

Enter a number in the range of 0 to 7787. The default is 10

Buffer offset limit for resuming in KB

Buffer offset limit at which the port resumes the peer in KB.

Enter a number in the range of 1 to 7787. The default is 10

Buffer shared threshold weight

Weightage of the priorities on the shared buffer size in the

system. Enter a number in the range of 0 to 9. The default

shared threshold weight is 10.

Introduced on the S4810, S4820T, S6000, and MXL