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Updated Examples for Application-isolated cores (r5, r6, dsr6, r7, dsr7, r8, dsr8)

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Closes Bug: 2007586

Signed-off-by: Juanita-Balaraj <juanita.balaraj@windriver.com>
Change-Id: Id0728682dafe03e362fccfade4092752f9613f98
This commit is contained in:
Juanita-Balaraj 2023-02-16 14:49:53 -05:00
parent 3eacb292c5
commit 010575bf19
1 changed files with 18 additions and 7 deletions
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25
doc/source/admintasks/kubernetes/isolating-cpu-cores-to-enhance-application-performance.rst
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@ -2,9 +2,9 @@
.. bew1572888575258
.. _isolating-cpu-cores-to-enhance-application-performance:
========================================================
Isolate the CPU Cores to Enhance Application Performance
========================================================
====================================================
Isolate CPU Cores to Enhance Application Performance
====================================================
|prod| supports running the most critical low-latency applications on host CPUs
which are completely isolated from the host process scheduler.
@ -21,11 +21,22 @@ For example:
.. code-block:: none
~(keystone_admin)]$ system host-lock worker-1
~(keystone_admin)]$ system host-cpu-modify -f platform -p0 1 worker-1
~(keystone_admin)]$ system host-cpu-modify -f application-isolated -p0 15 worker-1
~(keystone_admin)]$ system host-cpu-modify -f application-isolated -p1 15 worker-1
~(keystone_admin)]$ system host-cpu-modify -f platform -p0 1 worker-1
~(keystone_admin)]$ system host-cpu-modify -f application-isolated -p0 15 worker-1
~(keystone_admin)]$ system host-cpu-modify -f application-isolated -p1 15 worker-1
~(keystone_admin)]$ system host-unlock worker-1
.. note::
It is possible to explicitly specify 1 or more cores or a range of cores to
be application-isolated:
.. code-block::
~(keystone_admin)]$ system host-cpu-modify -f application-isolated -c 3 controller-0
~(keystone_admin)]$ system host-cpu-modify -f application-isolated -c 3,4 controller-0
~(keystone_admin)]$ system host-cpu-modify -f application-isolated -c 3-5 controller-0
All |SMT| siblings (hyperthreads, if enabled) on a core will have the same
assigned function. On host boot, any CPUs designated as isolated will be
specified as part of the isolcpus kernel boot argument, which will isolate them
@ -35,7 +46,7 @@ The use of application-isolated cores is only applicable when using the static
Kubernetes CPU Manager policy. For more information,
see :ref:`Kubernetes CPU Manager Policies <kubernetes-cpu-manager-policies>`.
.. note::
.. note::
|prod| isolcpus allocation is |SMT|-aware. If a container requests multiple
isolcpus it will provide |SMT| siblings to the extent possible. If an odd