high CPU utilization

[Md. Abdullah-Al-Mamun]

Hi,

I am facing a problem in my ME3400-24FS-A Switch, the switch is in production and showing high CPU utilization and for that clients are facing slow performance who are connected to the switch.  All ports of the switch are plugged with 100BaseLX-FE sfp.

Need your advice, how i can keep the switch in normal cpu utilization. 

Here is process details of the switch:

CPU utilization for five seconds: 53%/0%; one minute: 57%; five minutes: 58%
PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process
  43   944513677  15399460      61334 37.45% 41.58% 41.69%   0 SFF8472
123   149825305  38051892       3937  6.45%  7.39%  7.18%   0 Hulc LED Process
  59     7700014  66240354        116  1.25%  0.43%  0.43%   0 Fifo Error Detec
250         115        98       1173  0.78%  0.12%  0.02%   1 Virtual Exec

Output is omitted

In the attached file you can see the show version of the switch, or if you need more information then let me know.

Regards,

Mamun

[gephelps]

The problem is related to one of the SFPs in the switch. I would try removing one at a time to see if the problem goes away.

[Md. Abdullah-Al-Mamun]

Thanks, I will check and let you know..

Regards,

Mamun

[ansverma]

This is a know internal bug which is not fixed yet. Upgrade to latest and do "no monitoring" to stop SFF8472 process to monitor the SFP module.

Thanks

Anshul

[ansverma]

HI,

The bug I was talking about is for ME3600, was not sure if that goes on ME3400 also. Howeever I have seen many case with same issue on ME3400, all of them resolved after replacing the SFP.

Thanks

Anshul

[Sandeep Sharma]

Hi Abdullah

As per the logs you have shared we can see that the high CPU is due to SFF8472 process and SFF8472 preocess handles the SFP transceivers.

So most probably high CPU is caused due to some faulty SFP so check and replace the SFP and check if issue get resolved. Even we have some known bugs that cause such issues. So in case after replacing the SFP you see that issue still persists I will recommend you to upgrade to the latest code.

Thanks & Regards

Sandeep

[ปลาวาฬทราย RMUTT CPE IX]

How to check which SFP has a problem?

Thank you very much.