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nova
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doc: update supported drivers for cpu topology 

Not only libvirt/KVM driver but also libvirt/QEMU works with cpu
topology feature in nova. So we just update the document.

Change-Id: If8f0229072c8518c9301a872b98862687d93a044
This commit is contained in:
Tetsuro Nakamura 2017-12-20 19:53:57 +09:00
parent 2506afda54
commit a15fc86c29
1 changed files with 9 additions and 0 deletions
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9
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
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
possible to configure how CPUs are represented in the instance itself. By
default, when instance NUMA placement is not specified, a topology of N
@ -362,3 +370,4 @@ guide.
.. Links
.. _`Image metadata`: https://docs.openstack.org/image-guide/image-metadata.html
.. _`discussion`: http://lists.openstack.org/pipermail/openstack-dev/2016-March/090367.html
.. _`MTTCG project`: http://wiki.qemu.org/Features/tcg-multithread