Public bug reported:

Please build the package with the --drop-cache patch available in the tarball, 
to avoid filling up the io cache with not re-queried copied data. The current 
behavior pushes the data of other process out of the cache and thus slows them 
down.

http://insights.oetiker.ch/linux/fadvise.html

** Affects: rsync (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/989301

Title:
  large rsync runs stall system perfomance (missing --drop-cache)

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