[Xen-users] Bug: xentop Domain-0 output CPU(sec) and CPU(%) sometimes too high

[Neszt Tibor <tibor@xxxxxxxx>]

Dear Xen users,

I use munin to monitor xen servers and the munin uses xentop command to 
gather information:
$ xentop -b -f -i2

In rare cases the output of this command gives too high (it seems buggy) 
values for CPU(sec) and CPU(%), this destroys the munin graphs.
I tested this command from cli. After 50.000 cycle of run i got 72 case of 
too high value.
Example normal values:
    NAME  STATE   CPU(sec) CPU(%)     MEM(k) MEM(%)  MAXMEM(k) MAXMEM(%) VCPUS 
NETS    NETTX(k)   NETRX(k) VBDS   VBD_OO   VBD_RD     VBD_WR  VBD_RSECT   
VBD_WSECT SSID
Domain-0 -----r   21836089    0.0    3976448    2.0    4194304       2.1    12  
  0           0          0    0        0        0          0          0         
  0    0
Domain-0 -----r   21836095  171.0    3976448    2.0    4194304       2.1    12  
  0           0          0    0        0        0          0          0         
  0    0
Domain-0 -----r   21836097    0.0    3976448    2.0    4194304       2.1    12  
  0           0          0    0        0        0          0          0         
  0    0
Domain-0 -----r   21836102  173.0    3976448    2.0    4194304       2.1    12  
  0           0          0    0        0        0          0          0         
  0    0
Domain-0 -----r   21836104    0.0    3976448    2.0    4194304       2.1    12  
  0           0          0    0        0        0          0          0         
  0    0

Example high values:
    NAME  STATE   CPU(sec) CPU(%)     MEM(k) MEM(%)  MAXMEM(k) MAXMEM(%) VCPUS 
NETS    NETTX(k)   NETRX(k) VBDS   VBD_OO   VBD_RD     VBD_WR  VBD_RSECT   
VBD_WSECT SSID
Domain-0 -----r 9245189809 298754082186.3    3975384    2.0    4194304       
2.1    12    0           0          0    0        0        0          0         
 0           0    0
Domain-0 -----r 9245193126 298571589937.4    3975384    2.0    4194304       
2.1    12    0           0          0    0        0        0          0         
 0           0    0
Domain-0 -----r 9245195656    0.0    3975384    2.0    4194304       2.1    12  
  0           0          0    0        0        0          0          0         
  0    0
Domain-0 -----r 9245199096    0.0    3975384    2.0    4194304       2.1    12  
  0           0          0    0        0        0          0          0         
  0    0
Domain-0 -----r 9245202319 295762713155.5    3976448    2.0    4194304       
2.1    12    0           0          0    0        0        0          0         
 0           0    0

Is this a bug?


Neszt Tibor
E-mail: tibor@xxxxxxxx
PGP: 0xD4CC8D9F
  Fingerprint = B005 B009 E093 25D4 B9E5  F3E8 C477 8F5B D4CC 8D9F

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