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Allow enabling PCI scheduling in Placement

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A new configuration option [filter_scheduler]pci_in_placement is added
that allows enabling the scheduler logic for PCI device handling in
Placement for flavor based PCI requests.

blueprint: pci-device-tracking-in-placement
Change-Id: I5ddf6d3cdc7e05cc4914b9b1e762fa02a5c7c550
This commit is contained in:
Balazs Gibizer
2022-08-28 19:20:05 +02:00
parent 2cf58d3d1e
commit 2cb1eedeaf
10 changed files with 77 additions and 69 deletions
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doc/source/admin/pci-passthrough.rst
+22
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@@ -65,6 +65,10 @@ capabilities.
:oslo.config:option:`pci.device_spec` configuration that uses the
``devname`` field.
.. versionchanged:: 27.0.0 (2023.1 Antelope):
Nova provides Placement based scheduling support for servers with flavor
based PCI requests. This support is disable by default.
Enabling PCI passthrough
------------------------
@@ -442,6 +446,24 @@ removed and VFs from the same PF is configured (or vice versa) then
nova-compute will refuse to start as it would create a situation where both
the PF and its VFs are made available for consumption.
Since nova 27.0.0 (2023.1 Antelope) scheduling and allocation of PCI devices
in Placement can also be enabled via
:oslo.config:option:`filter_scheduler.pci_in_placement`. Please note that this
should only be enabled after all the computes in the system is configured to
report PCI inventory in Placement via
enabling :oslo.config:option:`pci.report_in_placement`. In Antelope flavor
based PCI requests are support but Neutron port base PCI requests are not
handled in Placement.
If you are upgrading from an earlier version with already existing servers with
PCI usage then you must enable :oslo.config:option:`pci.report_in_placement`
first on all your computes having PCI allocations and then restart the
nova-compute service, before you enable
:oslo.config:option:`filter_scheduler.pci_in_placement`. The compute service
will heal the missing PCI allocation in placement during startup and will
continue healing missing allocations for future servers until the scheduling
support is enabled.
If a flavor requests multiple ``type-VF`` devices via
:nova:extra-spec:`pci_passthrough:alias` then it is important to consider the
value of :nova:extra-spec:`group_policy` as well. The value ``none``