Lucent Technologies Stinger, Руководство администратора

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4-6 Stinger® Administration Guide
Monitoring System and Network Processor operations
Optimizing system performance
Configuration recommendations
Setting np-update-time to between 10-20 seconds is strongly recommended,
particularly when a large number of filter and/or classification rules are configured
on the system. With the default zero value, system response time and call
performance are noticeably impacted when many updates must be communicated to
the underlying hardware, as would occur, for example, after a system reset. A setting
between 10-20 seconds allows a greater number of configuration changes to be
batched together, which results in improved overall system and call performance.
The trade-off is the delay before filter and/or flow classification configurations
become effective.
Table 4-1 shows how call performance varies with different values of np-update-time
when 300 IPoA/BIR calls are configured. with six filter profiles (having six input
and six output rules) and two packet-flows profiles (having 16 classification rules for
IPoA calls and 6 classification rules for BIR calls) applied to the calls.
System response time also improves dramatically when np-update-time is non-zero.
For example, the following configuration specifies a delay of 10 seconds for filter and
flow classification updates, with the default
forward filtering policy to be applied
during the 10-second update interval:
admin> read system
admin> set np-update-time = 10
admin> write -f
Adjusting network processor FPP memory compaction
Frequent operations inside the Fast Pattern Processor (FPP) memory component of
the IP2000 module can result in memory fragmentation. The system routinely
performs compaction to retrieve the fragmented memory.
The
np-fpp-compact-timer
parameter in the
system
profile controls the time interval
(in seconds) between FPP memory compaction. By default, this interval is set to
3600 seconds (60 minutes). That is, the system performs FPP compaction every 60
minutes.
When the current FPP memory approaches the maximum of 8MB, administrators set
the
np-fpp-compact-timer
parameter to a lower value to increase the frequency of
compaction. (The debug comma
nd pmem sta fppmem
displays the current FPP
memory.) Valid settings for the
np-fpp-compact-timer
parameter are from 0 to
86400 seconds. For example
admin> set np-fpp-compact-timer = 1800
Table 4-1. Sample call performance statistics with different values of np-update-time
np-update-time value
(in seconds)
Time required for 300 sample calls to come up
(in minutes)
0 20
15 4
20 2