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| author | Ilya Popov <ilya_p@hotmail.com> | 2021-08-23 16:44:25 +0300 |
|---|---|---|
| committer | Ilya Popov <ilya_p@hotmail.com> | 2022-02-08 10:46:28 +0300 |
| commit | d13412648d011994a146dac1e7214ead3b82b31b (patch) | |
| tree | 333d42e680e51da8fa0b20e3622245e99679efc0 /nova/conf | |
| parent | b6fe7521afa8d42febc68f5f79782f7bcc3b568f (diff) | |
| download | nova-d13412648d011994a146dac1e7214ead3b82b31b.tar.gz | |
Fix to implement 'pack' or 'spread' VM's NUMA cells
Cells mean NUMA cells below in text.
By default, first instance's cell are placed to the host's cell with
id 0, so it will be exhausted first. Than host's cell with id 1 will
be used and exhausted. It will lead to error placing instance with
number of cells in NUMA topology equal to host's cells number if
some instances with one cell topology are placed on cell with id 0
before. Fix will perform several sorts to put less used cells at
the beginning of host_cells list based on PCI devices, memory and
cpu usage when packing_host_numa_cells_allocation_strategy is set
to False (so called 'spread strategy'), or will try to place all
VM's cell to the same host's cell untill it will be completely
exhausted and only after will start to use next available host's
cell (so called 'pack strategy'), when the configuration option
packing_host_numa_cells_allocation_strategy is set to True.
Partial-Bug: #1940668
Change-Id: I03c4db3c36a780aac19841b750ff59acd3572ec6
Diffstat (limited to 'nova/conf')
| -rw-r--r-- | nova/conf/compute.py | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/nova/conf/compute.py b/nova/conf/compute.py index 5cf8c31714..263d777586 100644 --- a/nova/conf/compute.py +++ b/nova/conf/compute.py @@ -1008,6 +1008,23 @@ Related options: filtering computes based on supported image types, which is required to be enabled for this to take effect. """), + cfg.BoolOpt('packing_host_numa_cells_allocation_strategy', + default=True, + help=""" +This option controls allocation strategy used to choose NUMA cells on host for +placing VM's NUMA cells (for VMs with defined numa topology). By +default host's NUMA cell with more resources consumed will be chosen first for +placing attempt. So the host cell with some usage will be packed with VM's cell +until it will be completely exhausted, before new free host's cell will be +used. When the packing_host_numa_cells_allocation_strategy variable is set to +``False``, host's NUMA cell with more resources available will be used. + +Possible values: + +* ``True``: Packing VM's NUMA cell on most used host NUMA cell. +* ``False``: Spreading VM's NUMA cell on host's NUMA cells with more resources + available. +"""), ] interval_opts = [ |