[Xen-API] Project Kronos - 6-9% constant cpu usage on qemu-dm processes

[Sébastien Riccio <sr@xxxxxxxxxxxxxxx>]

Hi,

While testing a windows 2008 server VM on xapi/debian, I found out that
the qemu-dm process is continuously taking around 6 to 9% of cpu usage
in dom0.

I compared it with a xenserver 5.6 fp2, and there is no such "load" on it.

Could this be a bug? How could I find out why it is taking cpu when the
vm is idle ?

Thanks a lot for your help.

Sébastien

ps: top output

Tasks: 175 total,   1 running, 174 sleeping,   0 stopped,   0 zombie
Cpu0  :  0.2%us,  1.0%sy,  0.0%ni, 98.8%id,  0.0%wa,  0.0%hi,  0.0%si,  
0.0%st
Cpu1  :  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  0.0%si,  
0.0%st
Cpu2  :  0.2%us,  0.0%sy,  0.0%ni, 99.8%id,  0.0%wa,  0.0%hi,  0.0%si,  
0.0%st
Cpu3  :  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  0.0%si,  
0.0%st
Cpu4  :  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  0.0%si,  
0.0%st
Cpu5  :  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  0.0%si,  
0.0%st
Cpu6  :  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  0.0%si,  
0.0%st
Cpu7  :  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  0.0%si,  
0.0%st
Mem:    835288k total,   582076k used,   253212k free,    27016k buffers
Swap:  1048572k total,    12176k used,  1036396k free,   237656k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 8235 root      20   0 32112 5324 1792 S    8  0.6   0:31.48 qemu-dm
 4356 root      20   0  238m  25m 7760 S    0  3.1   0:41.25 xapi
[cropped]


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