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High cpu rate in Catalyst 3750 with HULC LED process

Stack with 4 Catalyst 3750G-PS, Ios: 12.2.(25)SEE2 C3750-ADVIPSERVICESK9-M the sh process cpu command indicates a 13%cpu utilization:

CPU utilization for five seconds: 21%/0%; one minute: 21%; five minutes:

21%

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

111 9018410 2681652 3363 13.73% 13.21% 13.11% 0 Hulc LED

Process

How can I solve this high cpu utilization for this process?

4 REPLIES
Cisco Employee

Re: High cpu rate in Catalyst 3750 with HULC LED process

Hi Luis,

HULC is a process responsible for link status detection. This task will be erformed after POST is done. The LED process wakes up every 40ms to maintain the LED states. Inside this infinite loop, it will perform the following tasks.

1. Gather Status Information.

2. Calculate Display Mode.

3. Calculate LED States.

4. Calculate the Color.

5. Write the settings to LED register.

The normal CPU value for this is within 5-15% range.

I have seen this process taking somewhere near 5-7% in release 12.2(25)SEB4 and sometimes breaking the stack and remaking the stack also lower down the cpu utilization for this process.

HTH

Ankur

*Pls rate helpfull post

Re: High cpu rate in Catalyst 3750 with HULC LED process

Hi Ankbasi,

Thanks for your info. We have 2 similar stacks with the same configuration. Idont know wy one of the stacks has this cpu utilization and the other one not:

C160P1SUR#sh processes cpu | include Hulc LED

49 0 2996 0 0.00% 0.00% 0.00% 0 Hulc LED

Alchemy

122 5277 434613 12 0.15% 0.04% 0.00% 0 Hulc LED

Process

Switch#sh processes cpu | include Hulc LED

39 1610 17161 93 0.00% 0.00% 0.00% 0 Hulc LED

Alchemy

111 11934155 3550072 3361 12.45% 12.99% 13.02% 0 Hulc LED

Process

Curiously if I disconect the switches of the stack and I reload every swith, all switches working isolated remain with the same cpu utilization for this HULC LED process.

Thanks in advance

Luis

Cisco Employee

Re: High cpu rate in Catalyst 3750 with HULC LED process

Hu Luis,

Can you confirm if your 2 other stacks are running the same IOS version which this stack is running?

Regards,

Ankur

Re: High cpu rate in Catalyst 3750 with HULC LED process

yes. Both are running the same IOS version

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