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[Tudor Bosman <tudorb@xxxxxxxxx>]

(In reply to Ondrej Bilka from comment #29)
> Wait, do you have overlapping source and destination areas? If so then a
> backward copy is necessary.

Backward copy is often used for non-overlapping areas as it is faster on
some Intel processors; see
https://bugzilla.redhat.com/show_bug.cgi?id=638477#c99 for an
explanation. I was pointing out that it also has the (unintended)
behavior of pessimizing mmap()ed file accesses.

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https://bugs.launchpad.net/bugs/727064

Title:
  [Natty] Strange beeping sound when viewing flash video

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