Users Guide

In Dell Networking OS Release 9.3(0.0), only the Max Use count mode of operation is supported for the computation of maximum counter
values.
Depending on the buffer space statistical values that you can obtain, you can modify the settings for buffer area to achieve enhanced
reliability and efficiency in the handling of packets. This evaluation and administration of buffer statistics is useful and important in
deployments that experience congestion frequently. The receive buffer must be large enough to save all data that is received when the
system processes a PFC PAUSE frame.
You can use the service-class buffer shared-threshold-weight queue0 ... queue7 number command in Interface
Configuration mode to specify the threshold weight for the shared buffer for each of the queues per port.
1 Create a 10-Gigabit Ethernet interface.
Dell(conf)#interface TenGigabitEthernet 1/1/1
2 Configure the threshold weight of the shared buffer for the queues you want. In this example, this setting is configured for queues 5
and 7.
Dell(conf-if-te-1/1/1)#Service-class buffer shared-threshold-weight queue5 4 queue7 6
Enabling Buffer Statistics Tracking
You can enable the tracking of statistical values of buffer spaces at a global level. The buffer statistics tracking utility operates in the max
use count mode that enables the collection of maximum values of counters.
To configure the buffer statistics tracking utility, perform the following step:
1 Enable the buffer statistics tracking utility and enter the Buffer Statistics Snapshot configuration mode.
CONFIGURATION mode
Dell(conf)#buffer-stats-snapshot
Dell(conf)#no disable
Enable this utility to be able to configure the parameters for buffer statistics tracking. By default, buffer statistics tracking is disabled.
2 Enable the buffer statistics tracking utility and enter the Buffer Statistics Snapshot configuration mode.
CONFIGURATION mode
Dell(conf)#buffer-stats-snapshot
Dell(conf)#no disable
Enable this utility to be able to configure the parameters for buffer statistics tracking. By default, buffer statistics tracking is disabled.
3 To view the buffer statistics tracking resource information depending on the type of buffer information, such as device-level details,
queue-based snapshots, or priority group-level snapshot in the egress and ingress direction of traffic, use show hardware
stack-unit <id> buffer-stats-snapshot unit <id> resource x
EXEC/EXEC Privilege mode
Dell#show hardware stack-unit 1 buffer-stats-snapshot unit 3 resource interface all queue
mcast 3
Unit 1 unit: 3 port: 1 (interface Fo 1/144)
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Q# TYPE Q# TOTAL BUFFERED CELLS
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MCAST 3 0
Unit 1 unit: 3 port: 5 (interface Fo 1/148)
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Q# TYPE Q# TOTAL BUFFERED CELLS
Quality of Service (QoS)
709