CPU UTILIZATION

[john.dejesus]

Can someone help me on identifying the source of high cpu on my router?

sh ver

Cisco IOS Software, C2600 Software (C2600-ADVIPSERVICESK9-M), Version 12.4(15)T14, RELEASE SOFTWARE (fc2)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2010 by Cisco Systems, Inc.

Compiled Tue 17-Aug-10 05:40 by prod_rel_team

ROM: System Bootstrap, Version 12.2(8r) [cmong 8r], RELEASE SOFTWARE (fc1)

ORIENT16F-2651XM uptime is 3 weeks, 3 days, 11 hours, 38 minutes

System returned to ROM by power-on

System restarted at 10:24:14 PHT Sat May 4 2013

System image file is "flash:c2600-advipservicesk9-mz.124-15.T14.bin"

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Cisco 2651XM (MPC860P) processor (revision 3.1) with 253952K/8192K bytes of memory.

Processor board ID JAD06320NYC

M860 processor: part number 5, mask 2

2 FastEthernet interfaces

2 Serial interfaces

2 Channelized E1/PRI ports

32K bytes of NVRAM.

49152K bytes of processor board System flash (Read/Write)

Configuration register is 0x2102

sh proc cpu sorted 5min | exc 0.00%.*0.00%.*0.00%

CPU utilization for five seconds: 42%/41%; one minute: 38%; five minutes: 40%

PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process

  75       41439      4706       8805  0.24%  0.04%  0.38%  66 SSH Process

   5     7792739    408104      19094  0.00%  0.35%  0.32%   0 Check heaps

224     5902215   1109100       5321  0.08%  0.07%  0.23%   0 SNMP ENGINE

222     2049861   2043835       1002  0.00%  0.02%  0.06%   0 IP SNMP

  52     2013004     35764      56285  0.00%  0.06%  0.05%   0 Per-minute Jobs

  71      951889   1869180        509  0.16%  0.02%  0.05%   0 IP Input

   2      346505    423102        818  0.08%  0.03%  0.03%   0 Load Meter

  70      383453  65634637          5  0.08%  0.03%  0.03%   0 IP ARP Retry Age

  33      378768   2115667        179  0.00%  0.03%  0.02%   0 Per-Second Jobs

  67      380424  65634635          5  0.00%  0.02%  0.02%   0 ACCT Periodic Pr

127      180708  21073383          8  0.08%  0.01%  0.00%   0 RBSCP Background

  57       63080   8460880          7  0.08%  0.00%  0.00%   0 e1t1 Framer back

  50       41341    211533        195  0.08%  0.00%  0.00%   0 Net Input

I tried to sort out the cpu processes but the output does not state why it show up a 42% for 5sec interval.

[Steve Fuller]

Hi John,

The CPU utilisation you're seeing is traffic related, typically caused by the router CPU doing route lookups for traffic it is forwarding.

Take a read of the forum post understanding show process cpu sorted 1min command as this explains the 5-second CPU utilisation you see i.e., 42%/41%, and what those two numbers mean.

Regards

[Joseph W. Doherty]

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Posting

Your 5 second stats shows most of your CPU is being used for "interrupt" processing, which (as Steve) also notes, is CPU used for packet forwarding.  (Remember on software based routers, CPU is used for packet forwarding, i.e. CPU will increase or decrease with the amount of traffic passing through the router.)

A 2651XM is rated at 40 Kpps, which is good for about 10 Mbps (duplex) of minimum sized Ethernet packets (assuming no other services are being used).