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Cisco 3725 CPU Over Load

This is very strange to me that router is using 24% cpu while sh proc does not show any process the one using/eating this one.

show proc cpu ouyput..

Router# sh proc cpu | exc 0.00%__0.00%__0.00%

CPU utilization for five seconds: 25%/24%; one minute: 25%; five minutes: 24%

PID Runtime(ms) Invoked uSecs

5Sec 1Min 5Min TTY Process

2 1816 1261734 1 0.00% 0.02% 0.00% 0 Load Meter

5 3552392 645526 5503 0.00% 0.05% 0.05% 0 Check heaps

47 1976700 106531 18555 0.32% 0.03% 0.00% 0 Per-minute Jobs

86 1342800 9707593 138 0.08% 0.01% 0.00% 0 IP Input

128 1668 12617805 0 0.00% 0.02% 0.00% 0 DHCPD Receive

140 2384 63082727 0 0.08% 0.02% 0.00% 0 RBSCP Background

203 738464 28841181 25 0.08% 0.01% 0.00% 0 BGP Router

234 11756 197143943 0 0.08% 0.07% 0.08% 0 PPP manager

235 7372 197150221 0 0.08% 0.04% 0.06% 0 PPP Events

246 897856 420780 2133 0.16% 0.01% 0.00% 0 BGP Scanner

247 804 60870 13 0.00% 0.20% 0.09% 162 Virtual Exec

248 42680 2105112 20 0.00% 0.00% 0.31% 163 Virtual Exec

Router: 3725

IOS: 12.4 (3b)

If you look into the output; one can see that cpu usage is above 24% but there is no process taking this or even we combine all the process using cpu, it is still less than 1 or 2 %....

What could be wrong? How can I check which process is using this amount of cpu. :)

7 REPLIES
Hall of Fame Super Gold

Re: Cisco 3725 CPU Over Load

Hello,

if you do "show proc cpu sorted", it should show you the processes in order of CPU percentage taken. If still you don't see a process accounting for the total, I suggest you cotnact the TAC for further investigation.

Hope this helps, please rate post if it does

New Member

Re: Cisco 3725 CPU Over Load

Router# show proc cpu sorted

CPU utilization for five seconds: 27%/26%; one minute: 26%; five minutes: 26%

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

5 3554988 645914 5503 0.24% 0.07% 0.06% 0 Check heaps

2 1816 1262492 1 0.08% 0.02% 0.00% 0 Load Meter

234 11756 197262402 0 0.08% 0.07% 0.08% 0 PPP manager

247 384 48309 7 0.08% 0.02% 0.00% 162 Virtual Exec

3 0 1 0 0.00% 0.00% 0.00% 0 chkpt message ha

6 1864 6263 297 0.00% 0.00% 0.00% 0 Pool Manager

7 0 2 0 0.00% 0.00% 0.00% 0 Timers

You see the result is same.. I still can't see the process taking this amount of CPU... What could be wrong? If it's not a bug in IOS.

Hall of Fame Super Gold

Re: Cisco 3725 CPU Over Load

Seems like a ghost process is using CPU without showing in the list. Certainly could be a bug. I suggest you to upgrade to latest maintenance of 12.4 that is (13b) as of today and if the problem persist, seek advice from the TAC.

Re: Cisco 3725 CPU Over Load

Hi,

Weired, i think that i've heard once that it has a special math to be done, and the original poster output is normal, as i get the same on one of my routers:

Router#sh processes cpu sorted | e 0.00%__0.00%__0.00%

CPU utilization for five seconds: 38%/36%; one minute: 36%; five minutes: 36%

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

4 76037508 6245904 12174 0.95% 0.13% 0.11% 0 Check heaps

111 604 932 648 0.63% 0.22% 0.08% 2 Virtual Exec

54 364648608 404073320 902 0.31% 0.29% 0.27% 0 IP Input

38 150057840 382240206 392 0.23% 0.28% 0.25% 0 ATM OAM Input

31 177433360 50006150 3548 0.15% 0.21% 0.23% 0 Per-Second Jobs

150 36713600 141562328 259 0.15% 0.06% 0.04% 0 BGP Router

152 16506796 21491286 768 0.07% 0.00% 0.00% 0 BGP I/O

37 4395220 6692061 656 0.00% 0.01% 0.00% 0 ATM ARP INPUT

28 23629696 5573067 4239 0.00% 0.01% 0.01% 0 Net Background

43 46479756 75497990 615 0.00% 0.06% 0.07% 0 CEF process

46 25796112 943220 27349 0.00% 0.02% 0.00% 0 Per-minute Jobs

73 55550860 1083328 51277 0.00% 0.10% 0.06% 0 IP Background

132 8563560 43976503 194 0.00% 0.01% 0.00% 0 TDP Hello

135 11006636 29476947 373 0.00% 0.03% 0.00% 0 ISIS Upd

138 27511900 52177642 527 0.00% 0.01% 0.00% 0 PDU DISPATCHER

139 171455016 53086972 3229 0.00% 0.02% 0.08% 0 SNMP ENGINE

153 376285784 5193129 72458 0.00% 0.57% 0.58% 0 BGP Scanner

157 8929208 6883160 1297 0.00% 0.02% 0.00% 0 RIP Router

158 2462152 2846367 865 0.00% 0.01% 0.00% 0 RIP Send

http://www.cisco.com/en/US/products/sw/iosswrel/ps1828/products_tech_note09186a00800a65d0.shtml#showproccpu

I think that i'll try to dig further to remember my old info.

BR,

Mohammed Mahmoud.

Re: Cisco 3725 CPU Over Load

Hi,

Ok, AFAIR the first number in the "sh processes cpu" indicates the total CPU utilization, while the second number indicates the percent of CPU time spent at the interrupt level, the difference between these 2 numbers should be summation of the time taken by each process, and thus your output is normal.

HTH,

Mohammed Mahmoud.

Hall of Fame Super Gold

Re: Cisco 3725 CPU Over Load

Correct, in my previous answer I must have had the brain switched off.

So you should check amount of traffic switched and if it is significant that indicates the the router is normal and healty.

New Member

Re: Cisco 3725 CPU Over Load

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