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[god <131094@xxxxxxxxxxxxxxxxxx>]

I can observe this even on ssd with both ubuntu and mainline kernels.
Especially when some background task like update.mlocate which spits out
fs-wide find is triggered.

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/131094

Title:
  Heavy Disk I/O harms desktop responsiveness

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: linux-source-2.6.22

  When compared with 2.6.15 in feisty, heavy disk I/O causes increased
  iowait times and affects desktop responsiveness in 2.6.22

  this appears to be a regression from 2.6.15 where iowait is much lower
  and desktop responsiveness is unaffected with the same I/O load

  Easy to reproduce with tracker - index the same set of files with
  2.6.15 kernel and 2.6.22 kernel and the difference in desktop
  responsiveness is massive

  I have not confirmed if a non-tracker process which does heavy disk
  i/o (especially writing) replicates this yet - will do further
  investigation soon

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