Dell Networking S6000 Uživatelský manuál stáhnout pdf (Strana 728)

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The maximum number of ports, including fan-out, supported is 104 and the maximum number of queues

supported is 21. Analyzing and evaluating buffer statistics enables monitoring of resources and tuning of

allocation of buffers. Max Use count mode provides the maximum values of counters accumulated over a

period of time. Current Use count mode enables you to obtain a snapshot of the counters, at a particular

time, using a triggering utility. The trigger can either be software-based or based on a predetermined

threshold event. Software-based triggers are supported, which are the values derived from the show

command output in the Max Use count mode. 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 0/8

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-0/8)#Service-class buffer shared-threshold-weight queue5 4

queue7 6

Enabling Buffer Statistics Tracking

This functionality is supported on the S6000 platform.

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:

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

You must enable this utility to be able to configure the parameters for buffer statistics tracking. By

default, buffer statistics tracking is disabled.

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