I also found this kind of messages :

Jun 20 16:09:48 ralphs-laptop kernel: [    0.000000] mtrr_cleanup: can not find 
optimal value
Jun 20 16:09:48 ralphs-laptop kernel: [    0.000000] please specify 
mtrr_gran_size/mtrr_chunk_size


Did you think that a kernel option like this will help? :


enable_mtrr_cleanup mtrr_spare_reg_nr=1 mtrr_gran_size=32M mtrr_chunk_size=128M

I read about that here:
http://forums.fedoraforum.org/showthread.php?t=283340

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https://bugs.launchpad.net/bugs/1137817

Title:
  [ivb] System freeze after high memory usage

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