openstack/nova
Code Issues Proposed changes

[doc]PCI in Placement tuning

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Related-Bug: #2070257
Related-Bug: #2126751

Change-Id: I602c78e02d1821fab202a91fc4e42e1b0cae42ad
Signed-off-by: Balazs Gibizer <gibi@redhat.com>
This commit is contained in:
Balazs Gibizer
2025-10-07 15:14:50 +02:00
parent 7278e661a4
commit 35b8a1cae9
1 changed files with 9 additions and 0 deletions
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9
doc/source/admin/pci-passthrough.rst
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@@ -393,6 +393,15 @@ PCI tracking in Placement
Please note that once it is enabled on a given compute host
**it cannot be disabled there any more**.
.. warning::
If you configure more than 8 PCI devices per compute with the same
product_id or resource_class then placement needs configuration tuning
to keep the scheduling speed acceptable. Please read the following
two release notes:
* https://github.com/openstack/placement/blob/master/releasenotes/notes/bug-2070257-allocation-candidates-generation-limit-and-strategy.yaml-e73796898163fb55.yaml
* https://github.com/openstack/placement/blob/master/releasenotes/notes/bug-2126751-optimize_for_wide_provider_trees-b50b7813fd0d9dd2.yaml
Since nova 26.0.0 (Zed) PCI passthrough device inventories are tracked in
Placement. If a PCI device exists on the hypervisor and
matches one of the device specifications configured via