Is there a good way to identify a machine that is helped by having this
on?   I'm curious as to what kind of hardware requires mtrr_cleanup to
perform well.

The 128 GB RAM Machine, did result in some RAM lost, but it wasn't
significant considering it has 128 GB of RAM (around 128 MB loss if
memory serves me).   If this improves graphical performance
significantly for many machines, it's probably worth the loss for
machines with huge amounts of RAM.

Does switching the graphics memory to Write Combining originate in KMS
now (instead of Xorg)?

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https://bugs.launchpad.net/bugs/1163587

Title:
  mtrr_cleanup: can not find optimal value, perhaps no longer needed?

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