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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

Did this issue start happening after an update/upgrade? Was there a
kernel version where you were not having this particular problem? This
will help determine if the problem you are seeing is the result of the
introduction of a regression, and when this regression was introduced.
If this is a regression, we can perform a kernel bisect to identify the
commit that introduced the problem.

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https://bugs.launchpad.net/bugs/1305237

Title:
  100% I/O usage due to jbd2

Status in “linux” package in Ubuntu:
  New

Bug description:
  
  I have 14.04 Beta 2 64-bit and Intel i7 Processor with 2.2Ghz clock, 4 GB RAM and 500 GB Harddrive.

  After using Ubuntu for some time, everything goes so slow and I cannot
  even move my USB mouse cursor, but only touchpad. Not possible to open
  even a terminal window.

  Here is the iotop output:

  http://pastebin.ubuntu.com/7227394/

  Also the cpu usage is around 3% only by chromium.

  I unmounted all ntfs disks (I even don't have sda8), but the problem
  is the same.

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