Dell Z9500 Reference Manual page 615

resource port 5 prio-group all history summary
linecard 0 unit 0 port 5 (interface te 0/4)
---------------------------------------------------------------
------------------------------------------------
PG#
Instance 4
Shared Hdrm [in CELLS]
---------------------------------------------------------------
------------------------------------------------
6
0
1
7
0
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 linecard 0 buffer-stats-snapshot unit 0
resource all
linecard: 0 unit: 0 port: 1 (interface Fo 0/0)
---------------------------------------
PG#
---------------------------------------
0
1
2
3
4
5
6
7
---------------------------------------
Q# TYPE
---------------------------------------
UCAST
UCAST
UCAST
UCAST
UCAST
UCAST
UCAST
Data Center Bridging (DCB)
Instance 1 Instance 2
Instance 5
Shared Hdrm Shared Hdrm
9 2
4 1
0 0
0 0
SHARED CELLS
0
0
0
0
0
0
0
0
Q# TOTAL BUFFERED CELLS
0 0
1 0
2 0
3 0
4 0
5 0
6 0
Instance 3
Shared Hdrm
0 0
7
0 0
0 0
HEADROOM CELLS
0
0
0
0
0
0
0
0
Shared Hdrm
1
1
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