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High CPU usage on Cisco3662AC router

Hi!

Due to demand of new features I upgraded Cisco3662AC router from 12.2 GD release to the last 12.3 GD and obvserved that after a period of working cpu usage grows to ~80-90%. The cause is TTY background process. This is output:

C3662#sh proc cpu sorted

CPU utilization for five seconds: 54%/5%; one minute: 58%; five minutes: 59%

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

31 100164896 571915 175142 41.65% 48.77% 48.96% 0 TTY Background

139 26342840 29269424 900 4.92% 3.21% 3.29% 0 Encrypt Proc

138 52324 2734 19138 0.98% 0.07% 0.40% 227 SSH Process

9 8629872 250729 34419 0.73% 0.58% 0.59% 0 Serial Backgroun

65 860476 3106106 277 0.49% 0.12% 0.30% 0 IP Input

204 458948 18063687 25 0.08% 0.10% 0.07% 0 PPP Events

195 226308 2818961 80 0.08% 0.02% 0.04% 0 FR LMI

210 190696 452551 421 0.08% 0.03% 0.01% 0 SNMP ENGINE

206 122012 35909153 3 0.08% 0.04% 0.04% 0 traffic_shape

208 133896 928202 144 0.08% 0.02% 0.00% 0 IP SNMP

47 61212 134496 455 0.08% 0.03% 0.02% 0 Compute load avg

10 32 11196 2 0.00% 0.00% 0.00% 0 IPC Dynamic Cach

11 0 1 0 0.00% 0.00% 0.00% 0 IPC Zone Manager

12 6520 572008 11 0.00% 0.00% 0.00% 0 IPC Periodic Tim

15 0 20 0 0.00% 0.00% 0.00% 0 AAA high-capacit

13 6200 572017 10 0.00% 0.00% 0.00% 0 IPC Deferred Por

17 100 22373 4 0.00% 0.00% 0.00% 0 Environmental mo

14 0 1 0 0.00% 0.00% 0.00% 0 IPC Seat Manager

19 82520 349044 236 0.00% 0.00% 0.00% 0 ARP Input

16 0 1 0 0.00% 0.00% 0.00% 0 OIR Handler

21 156 7518 20 0.00% 0.00% 0.00% 0 DDR Timers

I tried the recomandation posted on site (no syncronous logging) but it does not help.

I also tried to change software several times (12.3. GD releases) but result is the same.

Bugtrack show that this type of behaivor was corrected long time ago but it seems that it is still not corrected.

What can I do else to avoid this problem?

Thanks

1 REPLY
Bronze

Re: High CPU usage on Cisco3662AC router

You may try giving command "no logging console" and see if it helps.

Following link may help you

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

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