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| author | Wang Huaqiang <huaqiang.wang@intel.com> | 2020-05-15 19:42:31 +0800 |
|---|---|---|
| committer | Wang Huaqiang <huaqiang.wang@intel.com> | 2020-07-21 15:18:41 +0800 |
| commit | 275ea2de368629485ba6e9a5159300d3b9232ed4 (patch) | |
| tree | c7014462af39f952d2d35fbf1f787ee6453b1da7 /doc/source | |
| parent | 5c71ac5e02acfbcc45f904a359a02d2a204e709e (diff) | |
| download | nova-275ea2de368629485ba6e9a5159300d3b9232ed4.tar.gz | |
hardware: create 'mixed' instance for realtime CPUs
Before, realtime CPUs could only be combined with dedicated CPUs
in a 'dedicated' policy instance. This patch supports to create
a type of instance that makes realtime CPUs be mixed with shared
CPUs under the 'mixed' CPU allocation policy.
Part of blueprint use-pcpu-and-vcpu-in-one-instance
Change-Id: Iad7864bf375341ef065bfec229a059e444c910e2
Signed-off-by: Wang Huaqiang <huaqiang.wang@intel.com>
Diffstat (limited to 'doc/source')
| -rw-r--r-- | doc/source/admin/cpu-topologies.rst | 26 | ||||
| -rw-r--r-- | doc/source/user/flavors.rst | 3 |
2 files changed, 20 insertions, 9 deletions
diff --git a/doc/source/admin/cpu-topologies.rst b/doc/source/admin/cpu-topologies.rst index fdb2d7b59e..07d8e400d9 100644 --- a/doc/source/admin/cpu-topologies.rst +++ b/doc/source/admin/cpu-topologies.rst @@ -221,10 +221,12 @@ use pinned CPUs. To configure a flavor to use the ``shared`` CPU policy, run: $ openstack flavor set [FLAVOR_ID] --property hw:cpu_policy=shared The ``mixed`` CPU policy is used to specify that an instance use pinned CPUs -along with unpinned CPUs. The instance pinned CPU is specified in the -``hw:cpu_dedicated_mask`` extra spec. For example, to configure a flavor to -use the ``mixed`` CPU policy with 4 vCPUs in total and the first 2 vCPUs as -pinned CPUs: +along with unpinned CPUs. The instance pinned CPU could be specified in the +``hw:cpu_dedicated_mask`` or, if real-time is enabled +(``hw:cpu_realtime``\ = yes), in the ``hw:cpu_realtime_mask`` extra spec. For +example, to configure a flavor to use the ``mixed`` CPU policy with 4 vCPUs in +total and the first 2 vCPUs as pinned CPUs, with the ``hw:cpu_realtime_mask`` +extra spec, run: .. code-block:: console @@ -233,13 +235,21 @@ pinned CPUs: --property hw:cpu_policy=mixed \ --property hw:cpu_dedicated_mask=0-1 -For more information about the syntax for ``hw:cpu_dedicated_mask``, refer -to the :doc:`/user/flavors` guide. +To create the mixed instance with the real-time extra specs, run: + +.. code-block:: console + + $ openstack flavor set [FLAVOR_ID] \ + --vcpus=4 \ + --property hw:cpu_policy=mixed \ + --property hw:cpu_realtime=yes \ + --property hw:cpu_realtime_mask=0-1 .. note:: - For more information about the syntax for ``hw:cpu_policy``, refer to the - :doc:`/admin/flavors` guide. + For more information about the syntax for ``hw:cpu_policy``, + ``hw:cpu_dedicated_mask``, ``hw:realtime_cpu`` and ``hw:cpu_realtime_mask``, + refer to the :doc:`/user/flavors` guide. It is also possible to configure the CPU policy via image metadata. This can be useful when packaging applications that require real-time or near real-time diff --git a/doc/source/user/flavors.rst b/doc/source/user/flavors.rst index 55b976b815..8faea47eaa 100644 --- a/doc/source/user/flavors.rst +++ b/doc/source/user/flavors.rst @@ -467,7 +467,8 @@ CPU pinning policy .. note:: The ``hw:cpu_dedicated_mask`` option is only valid if ``hw:cpu_policy`` - is set to ``mixed``. + is set to ``mixed`` and cannot be configured with ``hw:cpu_realtime_mask`` + at the same time. Valid CPU-THREAD-POLICY values are: |