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BZ-1871794: Added an IMPORTANT note to the config-yaml file

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Samantha Gidlow
2021-06-01 13:47:53 -04:00
committed by openshift-cherrypick-robot
parent 5e7bcfb1b1
commit 392ececbeb
1 changed files with 6 additions and 1 deletions
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7
modules/installation-bare-metal-config-yaml.adoc
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@@ -218,9 +218,14 @@ of {product-title} will support defining multiple compute pools during
installation. Only one control plane pool is used.
<3> Whether to enable or disable simultaneous multithreading (SMT), or `hyperthreading`. By default, SMT is enabled to increase the performance of your machines' cores. You can disable it by setting the parameter value to `Disabled`. If you disable SMT, you must disable it in all cluster machines; this includes both control plane and compute machines.
+
[NOTE]
====
Simultaneous multithreading (SMT) is enabled by default. If SMT is not enabled in your BIOS settings, the `hyperthreading` parameter has no effect.
====
+
[IMPORTANT]
====
If you disable simultaneous multithreading (SMT) using the `install-config.yaml` file or in your BIOS settings, ensure that your capacity planning accounts for the dramatically decreased machine performance. If you disable SMT in the BIOS, the `hyperthreading` parameter in the `install-config.yaml` file will have no effect.
If you disable `hyperthreading`, whether in the BIOS or in the `install-config.yaml`, ensure that your capacity planning accounts for the dramatically decreased machine performance.
====
<4> You must set the value of the `replicas` parameter to `0`. This parameter
controls the number of workers that the cluster creates and manages for you,