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I see lots of those on my production server, they come and go and take up lots of CPU time

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
   17 root      RT   0     0    0    0 S 1661  0.0   4728:03 migration/3
   29 root      RT   0     0    0    0 S 1508  0.0   4728:03 migration/6
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migrated from stackoverflow.com Jun 24 '12 at 11:51

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The migration kernel process distributes workload across CPU cores. You should have one migration process per processor core.

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"migration" is a kernel process

Check here

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4  
Down-voted for providing a link with no summary of what said process is. Up-voted the Answer which doesn't merely link, and actually explains the answer. – Jeff Welling Mar 27 '13 at 17:42

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