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14.5. Memory Management Elements
The API provides two configuration settings for a host's memory management.
Kernel SamePage Merging (KSM) reduces references to memory pages from multiple identical pages to a single page reference. This helps with optimization for memory density. KSM uses the
ksm element.
Example 14.4. Setting KSM memory management
PUT /ovirt-engine/api/hosts/2ab5e1da-b726-4274-bbf7-0a42b16a0fc3 HTTP/1.1
Accept: application/xml
Content-Type: application/xml
<host id="2ab5e1da-b726-4274-bbf7-0a42b16a0fc3"
href="/ovirt-engine/api/hosts/2ab5e1da-b726-4274-bbf7-0a42b16a0fc3">
<ksm>true</ksm>
</host>
Transparent Hugepage support expands the size of memory pages beyond the standard 4kB limit. This reduces memory consumption and increases host performance. Transparent Hugepage support uses the
transparent_hugepages element.
Example 14.5. Setting Transparent Hugepage memory management
PUT /ovirt-engine/api/hosts/2ab5e1da-b726-4274-bbf7-0a42b16a0fc3 HTTP/1.1
Accept: application/xml
Content-Type: application/xml
<host id="2ab5e1da-b726-4274-bbf7-0a42b16a0fc3"
href="/ovirt-engine/api/hosts/2ab5e1da-b726-4274-bbf7-0a42b16a0fc3">
<transparent_hugepages>true</transparent_hugepages>
</host>
Availability of Transparent Hugepage support is found in the
capabilities collection.
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