[Xen-devel] abnormal CPU utilization

[tinnycloud <tinnycloud@xxxxxxxxxxx>]

Hi George:

 

         We have observed abnormal CPU utilization behavior on our HVMS.

 

         There are two same physical hosts, with exactly same Xen and dom0 kernel installed,

The host owns 24G memory and 16 CPUS.

On each of the host, a HVM is running.

(WIN2008, 16G MEM, 8VCPUS, derive from same base VHD image)

 

That is  we have same HVMA, HVMB on different host.

 

Some days after, HVMA behaves quite abnormal, every time I start an application inside VM,

its CPU utilization  grows and drops very quickly(up to 80%), so it feels that the system is very lag.

While, HVMB works fine.

 

So it makes me to guess that processes on HVMA consume more CPU than HVMB.

 

Later, I run superPI tests on both HVMS, calculate 320million PI.

Here is the result.

 

                                                       HVMA                             HVMB

End of initialization. Time:  2min, 54 Sec.                12sec

         1st time completion:            5min, 05 Sec                        49 sec

         2^nd time completion:            6min, 14 Sec                      1min, 32sec

          3^rd time completion:            7min,  17Sec                      2min 14 sec

         4^th time completion :            8min  22, sec                     2min 57

         5^th time completion :            9min , 48 sec                     3min 40

                          …….                              ……                                             ……

          24^th time completion             29min 52                           16min 59

        

 

         From the data above, the initialization  time of superPI for HVMA is much slower than HVMB.

         And every calculation of PI for HVMA is a bit slower than HVMB.

 

         How could this happen, could you enlighten me some?

         Many thanks.

 

 

 

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