To elaborate on Oli's "no known drawbacks" comment, I think it's clear
that some people don't understand how zram works.  While you're telling
it that you can use up to 50% of your RAM for compressed swap, that
doesn't actually kick in until you run out of RAM, precisely the point
where you'd normally be hitting disk for swap instead.

So, if you only ever commit 3.9G on a 4G system, zram does essentially
nothing.  If you overcommit, it'll start swapping from ram to zram and
eating memory, but this all happens so much faster than you can swap to
disk that I have yet to see it be a bad thing (in fact, I've been
arguing for a while that we should just enable zram on all machines,
regardless of configuration).

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https://bugs.launchpad.net/bugs/933712

Title:
  casper configures system to use 50% ram for compressed swap post
  installation

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