Specifications

3-23
Cisco AS5x00 Case Study for Basic IP Modem Services
11/24/1999
Section 3 Commissioning the Cisco AS5800 Hardware
Verifying Basic Setup
Step 3
Perform some useful memory calculations:
Total processor = total RAM minus the IOS image size (use the
show version
command to get the
MB assigned for all of IOS + processor)
cisco 7206 (NPE200) processor with 114688K/16384K bytes of memory.
114688 KB / (1024 KB / MB) = 112.0 MB
16384 KB = 16 MB
112 MB + 16 MB = 128 MB (what you purchased).
Note that 112.0 MB - 89.7 MB = 22.3 MB. This means that 22.3 MB are not available for processor
memory.
1.8 Inspecting CPU Utilization
High utilization causes network performance problems. For example, knowing when the router is
running at over 50% utilization is critical. The router might start dropping packets if an unexpected
traffic burst comes through or if OSPF gets recalculated. Fast switching reduces CPU utilization.
Router#show processes cpu
CPU utilization for five seconds: 20%/6%; one minute: 31%; five minutes: 19%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
1 144208 1526300 94 0.00% 0.00% 0.00% 0 Load Meter
2 118732 19749060 6 0.24% 0.12% 0.08% 0 OSPF Hello
3 42752544 2699659 15836 3.75% 0.87% 0.62% 0 Check heaps
4 7260 30062 241 0.00% 0.00% 0.00% 0 Pool Manager
5 0 2 0 0.00% 0.00% 0.00% 0 Timers
6 1472 494101 2 0.00% 0.00% 0.00% 0 Serial Background
7 49424 7631216 6 0.00% 0.00% 0.00% 0 EnvMon
8 0 1 0 0.00% 0.00% 0.00% 0 OIR Handler
9 13368616 3217631 4154 0.32% 0.57% 0.42% 0 ARP Input
10 18932 533419 35 0.00% 0.00% 0.00% 0 DDR Timers
11 116 4 29000 0.00% 0.00% 0.00% 0 Entity MIB API
. . .
Snip
Look at the top line of the output. If you see high utilization numbers, for example over 50%, inspect
the columns 5Sec, 1Min, and 5Min. Find the process that uses the most CPU power. For an idle chassis,
numbers larger than two percent indicate a problem. The CPU utilization is displayed at the top of the
display. See the following table for the field descriptions.
Table 3-4 describes the significant output fields in the previous example:
Table 3-4 CPU Utilization Display Fields
Field Description
CPU utilization for five seconds:
20%/6%;
The first % number is the CPU utilization for the last
5 seconds. The second % number is the percentage of
CPU time spent at the packet-based interrupt level.
one minute: 31%;
CPU utilization for the last minute.
five minutes: 19%
CPU utilization for the last 5 minutes.