Enable the Huge Pages support¶

This section exaplains how to configure the support for the Huge Pages feature in your MCP depoyment.

To enable Huge Pages:

1. Log in to the host machine.

2. To verify that CPU supports Huge Pages, analyze the system response of the following command:

   cat /proc/cpuinfo
   

   In the system output, search for the parameters:

   • PSE - support of 2MB hugepages
   • PDPE1GB - support of 1GB hugepages

3. Include the class in cluster.<name>.openstack.compute:

   - system.nova.compute.nfv.hugepages
   

4. Set the parameters in cluster.<name>.openstack.init on all compute nodes:

   compute_hugepages_size: 1G # or 2M
   compute_hugepages_count: 40
   compute_hugepages_mount: /mnt/hugepages_1G # or /mnt/hugepages_2M
   

5. Select from the following options:

   • If you are performing the initial deployment your environment, proceed with the further environment configurations.

   • If you are making changes to an existing environment, re-run the salt configuration on the Salt Master node:

     salt "cmp*" state.sls linux,nova
     

6. Reboot the affected servers.

7. If you need to set different values for each compute node, define them in cluster.<name>.infra.config for each node.

   Example:

   openstack_compute_node02:
     name: ${_param:openstack_compute_node02_hostname}
     domain: ${_param:cluster_domain}
     classes:
     - cluster.${_param:cluster_name}.openstack.compute
     params:
       salt_master_host: ${_param:reclass_config_master}
       linux_system_codename: xenial
       compute_hugepages_size: 1G # or 2M
       compute_hugepages_count: 40
       compute_hugepages_mount: /mnt/hugepages_1G # or /mnt/hugepages_2M