Hulc LED Process

[billy.bakti]

Hi All,..

I saw in my switch there is a hig processor CPU in PID 110, could you please advice me what it is? and how to solve this?

Device type : WS-C3560G-48PS

-----------------------------------------

Switch#sh proc cpu sor

CPU utilization for five seconds: 23%/0%; one minute: 22%; five minutes: 21%

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

110 11990607 1436516 8347 15.97% 15.83% 15.84% 0 Hulc LED Process

-----------------------------------------

Thanks

[Yudong Wu]

Hulc LED Process is a process responsible for link status detection.

If there is SFP port in use, it might be a little bit high.

You can check if you hit the following bug.

CSCsi78581 Hulc LED Process uses 10-15% CPU on Catalyst 3750/3560.

[wim_depauw]

Hi,

We have a similar problem on a 2960 with SFP ports.

Is this bug only related to 3750/3560 or also to 2960 ? I can't find a bug on the bug toolkit...

Our CPU is running around 25 - 30 % so we would like to decrease it if possible.

Do you know a workaround ?

gr

[Yudong Wu]

That bug is not related to 2960.

I tested 2960 in the lab. If it is 2960 with PoE, Hulc LED process will use about 15% CPU.

In general, it is normal for 2960 to have cpu usage around 15-40%.

If you don't have any performance issue, you can ignore this.

[paolo bevilacqua]

CSCsi78581 lists this fixed in in 12.2(44)SE only, when it will be fixed in other newer versions ?

I have it on 48 ports 2960 thta can ony run 12.2(50) and higher.

[paolo bevilacqua]

On one of the 2960-48 that suffer this, I've loaded for a try 12.2(52)SE

Hulc LED remained the same, but general CPU utilli went up actually with "REP LSL" ?!?.

CPU utilization for five seconds: 34%/0%; one minute: 30%; five minutes: 29%
PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process
114     9582762   1518651       6310 15.65% 15.40% 15.50%   0 Hulc LED Process

96        1834       108      16981  5.11%  0.41%  0.08%   1 SSH Process
238      192955     73776       2615  3.35%  0.63%  0.40%   0 SNMP ENGINE
236       78907    133133        592  2.07%  0.31%  0.17%   0 IP SNMP
183     4008328 164163844         24  1.27%  7.01%  7.28%   0 REP LSL Hello PP

Can't Cisco fix this ?

[dancandea]

disable not-connected ports and you'll see a drop in the cpu usage for this process

[w951duu]

I shut down the SPF ports not in use and saw CPU drop by a minimum of 20% on all of my 2960S-POE switches:

[w951duu]

Then it came right back up to %60

[Leo Laohoo]

Upgrade to either 12.2(55)SE3 or 12.2(58)SE1.

[George Ageraniotis]

Hi,

After disable two SFP ports in 2960 the "Hulc LED process" dropped to 6.23%. Before it was 15.65%!!

leolaohoo,

     This IOS (58) isn't consuming a lot of memory?

[Leo Laohoo]

I've got news for you George, STAY AWAY from IOS level 15.0.  Across the board, it's got a memory leak issue WITHOUT any configs.

I'm currently using 12.2(58)SE1 and I have no issue. 

[SSCH1NDLER]

Hi,

i've got the same problem. We have two 3560x 48P running IOS 12.2(58)SE2 and the HULC LED process takes over 15% cpu load.

For what this process is responsable?

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100

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30 **********************************************************

20 **********************************************************

10 **********************************************************

   0....5....1....1....2....2....3....3....4....4....5....5....

             0    5    0    5    0    5    0    5    0    5

               CPU% per second (last 60 seconds)

    4444445444444444444444444444444444444444444444444444444444

    5533537321232332633343242222223322445244332224325233535342

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50 **  * *         *                   *           *   * *

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   0....5....1....1....2....2....3....3....4....4....5....5....

             0    5    0    5    0    5    0    5    0    5

               CPU% per minute (last 60 minutes)

              * = maximum CPU%   # = average CPU%

     1       1                 1     1111                       1

    7068757780566565576559785560556660000566555666976756656774670765667657

    3032391000910845988349359340222180000048268309429544494069810073970443

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   0....5....1....1....2....2....3....3....4....4....5....5....6....6....7.

             0    5    0    5    0    5    0    5    0    5    0    5    0

                   CPU% per hour (last 72 hours)

                  * = maximum CPU%   # = average CPU%

3560-x#sh processes cpu sorted 5min

CPU utilization for five seconds: 35%/0%; one minute: 35%; five minutes: 38%

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

129  1769580351 396248960       4465 15.97% 15.39% 14.11%   0 Hulc LED Process

  60  1017745522 191907631       5303  8.62%  7.60%  7.13%   0 RedEarth Tx Mana

211  1379704348  90033624      15324  0.15%  1.23%  5.45%   0 REP LSL Hello PP

  59   266213943 266690463        998  2.23%  1.93%  1.92%   0 RedEarth I2C dri

  97   394926822  33075411      11940  1.59%  1.55%  1.54%   0 hpm counter proc

[Mike Clites]

I have the same issue as ssch1ndler does; exact same code revision but my usage for this particular process sits at 20% even after turning off the 4 gi1/1 - 4 ports.

Anyone know if a newer version of the code has fixed this high cpu process?

Thank you

[paolo bevilacqua]

I have fought this matter with the TAC for quite a long time, they were adamant:

no fix is possible (hard to believe, I know) and one has to keep it as it is.