Kernel does not honour option "transparent_hugepage=always" when little RAM is installed to the system

Solution Verified - Updated -

Issue

  • Appending transparent_hugepage=always at kernel command line in grub.conf does not work, transparent_hugepage remains disabled:
# cat /sys/kernel/mm/redhat_transparent_hugepage/enabled 
always [never]
  • However following command enables it:
echo always  > /sys/kernel/mm/redhat_transparent_hugepage/enabled

Environment

  • Red Hat Enterprise Linux 6
  • Architecture x86_64

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