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

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Subject: [Xen-API] Project Kronos - 6-9% constant cpu usage on qemu-dm processes
From: Sébastien Riccio <sr@xxxxxxxxxxxxxxx>
Date: Wed, 07 Sep 2011 12:32:41 +0200
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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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