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CPU-Usage A5120-SI

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  • 1.  CPU-Usage A5120-SI

    Posted Mar 20, 2012 04:42 AM

    Hi,

     

    I have noticed a strange behaviour of an A5120-SI switch. OK, the behaviour seems strange to me. :-)

     

    If I check CPU-Usage on a new switch, I get approx. 5%. If I plug in a SFP module it raises to approx. 12%, a second one lets it raise to approx. 20%, and a third one to approx. 27%. Is this behaviour by design? The switch is not connected to anything and not configured. The same CPU-Usage shows up on a A5120-SI with three SFPs in an IRF fabric.The software installed on the switch is Comware Version 5.20 Release 1505P07, the latest available.

     

    Regards, Leonardo


     


    #A5120-SI
    #CPU-Usage
    #SFP


  • 2.  RE: CPU-Usage A5120-SI

    Posted Mar 21, 2012 09:59 AM

    Digging into the CPU-Usage issue we could find out that the "DrvT" task ist consuming CPU time (see attached .jpg screenshots).

     

    Any ideas?

     

     



  • 3.  RE: CPU-Usage A5120-SI

    Posted Mar 28, 2012 05:09 AM

    Hi

     

    Yes, this is usual. I discovered this on several devices.

    The explenation of the R&D was, that they have to poll the up/down-state of the sfp links every ms to react to changes.

     

     

    br

    Manuel