[Bug 997695] Missing required logs.

[Brad Figg]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 997695

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

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https://bugs.launchpad.net/bugs/997695

Title:
  severe performance issue using mdadm raid5 on top of LUKS

Status in “cryptsetup” package in Ubuntu:
  New
Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I've upgraded to 12.04 a few days ago and since this, the performance
  of my crypto-drive is limited by CPU.

  I'm running an MDADM RAID5 on top of 7 independendtly encrypted drives
  (Seagate Barracuda XT 7200.12 2TB each encrypted using crypsetup /
  LUKS).

  The problem seems to be, that in 12.04 all encryption is done using
  only a single CPU core. In 10.04 each crypt-device used its own thread
  (kcrypt), that was the reason to encrypt each device independently and
  build a raid on top of the crypto devices.

  I'll attach a screenshot of munins iostat and CPU graph to illustrate
  the difference before and after the upgrade

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