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Community Member

High CPU on 3560 with no traffic

Hi Experts,

I have a Cisco 3560 running IOS 12.2 SE(35). I have just installed it. No traffic on it. But the CPU on it is always high - 25 - 35 %.

Hulc LED Process - what is this please ?

sh proc cpu sor

CPU utilization for five seconds: 22%/0%; one minute: 22%; five minutes: 24%

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

110 313910 37700 8326 15.97% 15.87% 15.70% 0 Hulc LED Process

81 11040 1872 5897 0.63% 0.57% 0.57% 0 hpm counter proc

166 2825 16926 166 0.31% 0.28% 0.21% 0 Spanning Tree

118 7126 395 18040 0.31% 0.33% 0.32% 0 HQM Stack Proces

130 2734 1871 1461 0.15% 0.14% 0.15% 0 PI MATM Aging Pr

35 663 386 1717 0.15% 0.02% 0.01% 0 Compute load avg

I would really appreciate any quick responses.

many thanks

arav

3 REPLIES
Silver

Re: High CPU on 3560 with no traffic

Hi Arav,

I'm not suure that it is what you are looking for:

CSCsi78581 (Catalyst 3750 switches)

When you enter the show process cpu privileged EXEC command on a Catalyst 3750 model WS-C3750G-48PS, the LED process no longer causes high CPU usage.

But it seems it is an IOS bug which resolved in 12.2(44)SE release.

Hope it helps, rate if does,

Krisztian

Community Member

Re: High CPU on 3560 with no traffic

Hi Krisztian,

Thank you for your reply.

Would you know if this will cause the CPU to max out when there is actual user traffic on the switch ? It is set to go live tomorrow !!

Cheers

arav

Silver

Re: High CPU on 3560 with no traffic

Hi Arav,

Actually that is the only thing I found about this issue so I don't know how it will impact the switch performance in production, but if you try to upgrade the IOS you will see.

Hope this helps, rate if does,

Krisztian

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