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How to Configuring 1G Hugepagesize

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 As mentioned by Eugene in the comments, Oracle currently don't recommend using 1G Hugepagesize. You can read more about this in MOS Doc ID 1607545.1. With that in mind, the rest of this section should probably be considered more of an academic exercise.
Check if your current hardware can support a Hugepagesize of 1G. If the following command produces any output, it can.
# cat /proc/cpuinfo | grep pdpe1gb
Edit the "/etc/grub.conf" file, adding the following entries on to the kernel line of the default grub entry. Adjust the "hugepages" entry to the desired number of 1G pages. Notice this includes the disabling of Transparent HugePages, which is not mandatory, but a good idea.
transparent_hugepage=never hugepagesz=1G hugepages=1 default_hugepagesz=1G
Check the current HugePages setup.
# grep Huge /proc/meminfo
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
#
Reboot and check the HugePages setup again.
#  grep Huge /proc/meminfo
HugePages_Total:       1
HugePages_Free:        1
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:    1048576 kB
#

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