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[Stefan Bader <stefan.bader@xxxxxxxxxxxxx>]

** Changed in: linux-ec2 (Ubuntu)
       Status: Fix Released => Confirmed

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https://bugs.launchpad.net/bugs/889012

Title:
  CPU time incorrect in 10.04

Status in linux-ec2 package in Ubuntu:
  Confirmed

Bug description:
  I want to report that the CPU time bug is still present in the
  following kernel

  2.6.32-317-ec2 on AWS instance m1.large

  with CPU

  model name : Intel(R) Xeon(R) CPU E5507 @ 2.27GHz

  I logged the output of ps every minute and I can now show the bug
  happening, as you can see the CPU time originally at 35790:43 does get
  corrupted and the next minute jumps at 17179869:11 to reach
  29322904:44 1 minute later

  www-data 8269 31.3 9.2 853516 725496 ? Sl Aug23 35789:36 /usr/local/lib/erlang/erts-5.8.4/bin/beam.smp -P ...
  www-data 8269 31.3 9.2 866128 731640 ? Sl Aug23 35790:09 /usr/local/lib/erlang/erts-5.8.4/bin/beam.smp -P ...
  www-data 8269 31.3 9.3 868704 738800 ? Sl Aug23 35790:43 /usr/local/lib/erlang/erts-5.8.4/bin/beam.smp -P ...
  www-data 8269 31.3 9.4 872964 742660 ? Sl Aug23 35791:17 /usr/local/lib/erlang/erts-5.8.4/bin/beam.smp -P ...
  www-data 8269 120093018 9.4 885060 748036 ? Sl Aug23 17179869:11 /usr/local/lib/erlang/erts-5.8.4/bin/beam.smp -P ... www-data 8269 10652 9.3 868748 739144 ? Sl Aug23 29322904:44 /usr/local/lib/erlang/erts-5.8.4/bin/beam.smp -P ...

  It took us around 3 months running this process at around 30% load to
  reach this condition

  Because of this problem the machine currently reports a load of 0 when
  instead we know it should report between 20 and 40% depending by the
  moment of the day.

  Please let me know If I need to open a specific ticket for this issue.

  Today we're going to upgrade to 2.6.32-319-ec2

  thanks,

  Paolo Negri

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