Dell S4810 Reference Manual page 583

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Shared Hdrm [in CELLS]

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In the following example, the Headroom Cells field indicates the amount of shared

buffer area that is allocated to store packets that are received after the pause frame

is received or a priority-based flow control pause frame is enabled. When an

inbound interface halts the sending of traffic, it must have the buffer space to save

all of the packets currently in the buffer, and also all of the packets that were

received before the device stops the sending of packets. Headroom space is used

for high-priority traffic that needs to be queued and preserved above the input

queue limit, such as keepalives and hello messages.

You can use the following sample command output to obtain a consolidated,

whole-scale set of statistical counters of buffer resource utilization in the system

and identify the ports that you want. All resources will be cleared after their values

are displayed.

Dell#show hardware stack-unit 0 buffer-stats-snapshot unit 0

resource all

Stack-unit: 0 unit: 0 port: 1 (interface Fo 0/0)

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Data Center Bridging (DCB)

SHARED CELLS

TOTAL BUFFERED CELLS

HEADROOM CELLS