How to change the default HugePage size in Red Hat Enterprise Linux ?

Environment

• Red Hat Enterprise Linux 10
• Red Hat Enterprise Linux 9
• Red Hat Enterprise Linux 8
• HugePage

Issue

• How to change the default HugePage size in Red Hat Enterprise Linux ?
• How to change the default HugePage size to 1GB on X86-64 platform?

Resolution

• The kernel boot parameter default_hugepagesz is used to set the size of the default HugeTLB page.

RHEL 9 & RHEL 10

• Execute the below command to set the default HugePage size to 1 GB.

# grubby --update-kernel=ALL --args="default_hugepagesz=1G"

• Reboot the node.

# reboot

• Verify the hugepages configuration.

# grep -i hugepagesize /proc/meminfo 
Hugepagesize:    1048576 kB

RHEL 8

• Set default_hugepagesz=1G in /boot/grub2/grubenv file to change the default HugePage size to 1GB on X86-64 platform.

# grep kernelopts /boot/grub2/grubenv
kernelopts=root=/dev/mapper/rhel-root ro resume=/dev/mapper/rhel-swap rd.lvm.lv=rhel/root rd.lvm.lv=rhel/swap rhgb quiet default_hugepagesz=1G

• Reboot the system for changes to take effect.

# reboot

• Verify the default HugePage size using the following commands.

# grep Hugepagesize: /proc/meminfo 
Hugepagesize:    1048576 kB

# hugeadm --pool-list
      Size  Minimum  Current  Maximum  Default
1073741824        0        0        0        *

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