13.5. 禁用透明巨页

Transparent Huge Pages (THP) 会试图自动执行创建、管理和使用巨页的大部分方面。由于 THP 自动管理巨页，因此并不始终对所有类型的工作负载进行最佳处理。THP 可能会导致性能下降，因为许多应用程序都自行处理巨页。因此，请考虑禁用 THP。以下步骤描述了如何使用 Node Tuning Operator (NTO)禁用 THP。

流程

使用以下内容创建文件，并将其命名为 thp-disable-tuned.yaml ：

apiVersion: tuned.openshift.io/v1
kind: Tuned
metadata:
  name: thp-workers-profile
  namespace: openshift-cluster-node-tuning-operator
spec:
  profile:
  - data: |
      [main]
      summary=Custom tuned profile for OpenShift to turn off THP on worker nodes
      include=openshift-node

      [vm]
      transparent_hugepages=never
    name: openshift-thp-never-worker

  recommend:
  - match:
    - label: node-role.kubernetes.io/worker
    priority: 25
    profile: openshift-thp-never-worker

apiVersion: tuned.openshift.io/v1
kind: Tuned
metadata:
  name: thp-workers-profile
  namespace: openshift-cluster-node-tuning-operator
spec:
  profile:
  - data: |
      [main]
      summary=Custom tuned profile for OpenShift to turn off THP on worker nodes
      include=openshift-node

      [vm]
      transparent_hugepages=never
    name: openshift-thp-never-worker

  recommend:
  - match:
    - label: node-role.kubernetes.io/worker
    priority: 25
    profile: openshift-thp-never-worker

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Toggle word wrap

创建 Tuned 对象：
```
oc create -f thp-disable-tuned.yaml
```
```
$ oc create -f thp-disable-tuned.yaml
```
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检查活跃配置集列表：

oc get profile -n openshift-cluster-node-tuning-operator

$ oc get profile -n openshift-cluster-node-tuning-operator

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验证

登录到其中一个节点，并执行常规 THP 检查来验证节点是否成功应用了配置集：
```
cat /sys/kernel/mm/transparent_hugepage/enabled
```
```
$ cat /sys/kernel/mm/transparent_hugepage/enabled
```
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输出示例
```
always madvise [never]
```
```
always madvise [never]
```
Copy to Clipboard Toggle word wrap

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13.5. 禁用透明巨页

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