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Cisco Bug: CSCum78607 - once in every 10 minutes, VSM CPU usage goes to 50% ( process hwclock )

Last Modified

Mar 20, 2018

Products (1)

  • Cisco Nexus 1000V Switch for VMware vSphere

Known Affected Releases

5.2(1)SV3(1.0.151) 5.2(1)SV3(1.0.51)

Description (partial)

Symptom:
VSM CPU spikes every 11-12 minutes

    5    1 1   5          5   1     15          5  1       5    
    529230199211418119217249211819310216238118431210215248319426
100                                                             
 90                                                             
 80                                                             
 70                                                             
 60 *                                                           
 50 *          *          *          *          *          *    
 40 #          #          #          #          #          #    
 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 minute (last 60 minutes)
              * = maximum CPU%   # = average CPU%

Conditions:
'show processes cpu' would show that 'hwclock' is responsible for hogging the CPU

PID    Runtime(ms)  Invoked   uSecs  1Sec    Process
-----  -----------  --------  -----  ------  -----------
28220        29275      1862  15722   49.0%  hwclock
    1         7712      6124   1259    0.0%  init

Note: This happens for a very short time and it maybe a bit difficult to catch it from the 'show processes cpu' output
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