How to enable HugePage support?

Let us assume, we need 1GiB of 2MiB-sized huge pages . This will require a minimum number of 512 such pages (i.e. 1GiB total) on each node.

To view the number of available pages on each node, execute:

grep HugePages /proc/meminfo

Sample Output:

AnonHugePages:         0 kB
ShmemHugePages:        0 kB
HugePages_Total:    1024
HugePages_Free:      671
HugePages_Rsvd:        0
HugePages_Surp:        0

If the number of available pages is less than 512, then the page count should be reconfigured as required, accounting for any other workloads which may be co-resident on the worker node and which also require them. For example:

echo 512 | sudo tee /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages

Ensure that the above changes are made persistent across reboots. This can be done by adding the required value to /etc/sysctl.conf

echo vm.nr_hugepages = 512 | sudo tee -a /etc/sysctl.conf

Next, to apply the Huge Page configuration changes of the node, you must either restart kubelet or reboot the node.