openstack/nova
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Merge "doc: update supported drivers for cpu topology"

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Zuul
2017-12-22 16:49:37 +00:00
committed by Gerrit Code Review
parent 5fca93d245 a15fc86c29
commit 5f27402edb
1 changed files with 9 additions and 0 deletions
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doc/source/admin/cpu-topologies.rst
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@@ -276,6 +276,14 @@ Customizing instance CPU topologies
The functionality described below is currently only supported by the The functionality described below is currently only supported by the
libvirt/KVM driver. libvirt/KVM driver.
.. note::
Currently it also works with libvirt/QEMU driver but we don't recommend
it in production use cases. This is because vCPUs are actually running
in one thread on host in qemu TCG (Tiny Code Generator), which is the
backend for libvirt/QEMU driver. Work to enable full multi-threading
support for TCG (a.k.a. MTTCG) is on going in QEMU community. Please see
this `MTTCG project`_ page for detail.
In addition to configuring how an instance is scheduled on host CPUs, it is In addition to configuring how an instance is scheduled on host CPUs, it is
possible to configure how CPUs are represented in the instance itself. By possible to configure how CPUs are represented in the instance itself. By
default, when instance NUMA placement is not specified, a topology of N default, when instance NUMA placement is not specified, a topology of N
@@ -362,3 +370,4 @@ guide.
.. Links .. Links
.. _`Image metadata`: https://docs.openstack.org/image-guide/image-metadata.html .. _`Image metadata`: https://docs.openstack.org/image-guide/image-metadata.html
.. _`discussion`: http://lists.openstack.org/pipermail/openstack-dev/2016-March/090367.html .. _`discussion`: http://lists.openstack.org/pipermail/openstack-dev/2016-March/090367.html
.. _`MTTCG project`: http://wiki.qemu.org/Features/tcg-multithread