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Performance attributes Crocus CNV
114 Reference manual
8.2 Introducing the performance attributes
Performance information can be used for the following:
•
If network problems arise, information about the history of the communication link can be reviewed
and analysed. These statistics can be useful to locate and solve the problem.
•
By collecting performance information, an operator can keep track of the global performance of the
network, e.g. network bottlenecks can be traced, etc.
Before discussing the performance attributes of the Crocus CNV in detail, some general information on
the performance attributes of the Crocus CNV is given.
This section can be broken up into two parts:
•
First, the timing of the performance information is explained.
•
Secondly, frequently used terms such as sysUpTime , min, max, avrg , count and time are explained.
Performance timing
The following table explains the performance information timing.
Interval Description
2 hours The performance information is accumulated during a 15 minutes time span,
called a period. After a period, the accumulated performance information is
written into a buffer. Then a new period starts. To cover a 2 hours interval, 8
periods are kept.
The buffer in which the information is stored, is a circular buffer. I.e. every 15
minutes the most recent measured and calculated values are added, and the
oldest values are lost.
24 hours The performance information is accumulated during a 2 hours time span, called
a period. After a period, the accumulated performance information is written into
a buffer. Then a new period starts. To cover a 24 hours interval, 12 periods are
kept.
The buffer in which the information is stored, is a circular buffer. I.e. every 2
hours the most recent measured and calculated values are added, and the
oldest values are lost.
since boot In this case, the performance information is kept since the latest cold boot of the
Crocus CNV. This can be considered as a performance information
summary .
The Crocus CNV does not contain a real-time clock, therefore time information is related to its internal
clock. To allow you to situate the time intervals in the real time, the
sysUpTime attribute is returned together
with the performance information.
Only the available performance information is displayed. If the interrogation happens shortly after boot, no
values are displayed. For example for the 2 hours and 24 hours intervals, the new performance
information is available only when a complete time span (15 minutes, 2 hours) has elapsed.