Cisco 6509 with SUP 720 cpu utilization is high

[kiran_8095]

Hi,

From couple of weeks we have observed the cpu utilization of cisco 6509 with SUP 720 is high. During daytime from 9:00 to 21:00 it keeps increasing & reaches 98% & after 21:00 becomes normal. We are unable to find the root cause for this behaviour. Any suggestions is welcome.  Attached is show version & show proc cpu history.

Thanks,

Kiran

[sanjeevmahadani]

Hi Kiran,

Pls. increase memory which is 64 mb only.

65536K bytes ( of Flash internal SIMM (Sector size 512K).

[kiran_8095]

Hi Sanjeev,

Thanks for your suggestion. But how is this related to High CPU utilization?

Regards,

Kiran

[sanjeevmahadani]

I am sorry Kiran,

IT was just information.

[kiran_8095]

Hi Everyone,

Any suggestions to find the reason for high CPU.

Regards,

Kiran

[Giuseppe Larosa]

Hello Kiran,

there was an Ask the expert event about this kind of issues

see

https://supportforums.cisco.com/message/3536828#3536828

also

http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a00800a70f2.shtml

more specific for C6500 the following:

http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a00804916e0.shtml

note:

you can use

show proc cpu sorted

to see the processes that use most resources first

Edit:

in your case most of cpu resources are taken by interrupts   ( the second number after the '/' represents interrupts)

show processes cpu

CPU utilization for five seconds: 49%/45%<<<<; one minute: 52%; five minutes: 50%

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

====> this means traffic that is process switched and sent to the cpu instead of being processed in hardware

see also

http://www.cisco.com/en/US/products/hw/routers/ps359/products_tech_note09186a00801c2af0.shtml

follow the document below it should be helpful are the slides associated to the ask the expert event

https://supportforums.cisco.com/docs/DOC-21945

Hope to help

Giuseppe