This can be reproduced on Focal/ussuri:
############ Computes:
$ os resource provider list
+--------------------------------------+-----------------------------------------------------+------------+--------------------------------------+----------------------+
| uuid | name
| generation | root_provider_uuid |
parent_provider_uuid |
+--------------------------------------+-----------------------------------------------------+------------+--------------------------------------+----------------------+
| ca3fa736-7e60-4365-9cc8-7afc78b53005 |
juju-98fb61-zaza-d6f2c7825043-9.project.serverstack | 5 |
ca3fa736-7e60-4365-9cc8-7afc78b53005 | None |
| 0605bd29-71d5-40ed-ab8f-eceeaaac59b5 |
juju-98fb61-zaza-d6f2c7825043-8.project.serverstack | 4 |
0605bd29-71d5-40ed-ab8f-eceeaaac59b5 | None |
+--------------------------------------+-----------------------------------------------------+------------+--------------------------------------+----------------------+
############ Mem Allocation ratio is 1:
$ openstack resource provider inventory list
ca3fa736-7e60-4365-9cc8-7afc78b53005
+----------------+------------------+----------+----------+----------+-----------+-------+-------+
| resource_class | allocation_ratio | min_unit | max_unit | reserved |
step_size | total | used |
+----------------+------------------+----------+----------+----------+-----------+-------+-------+
| VCPU | 16.0 | 1 | 8 | 0 |
1 | 8 | 2 |
| MEMORY_MB | 1.0 | 1 | 16008 | 2048 |
1 | 16008 | 13960 |
| DISK_GB | 1.0 | 1 | 77 | 0 |
1 | 77 | 20 |
+----------------+------------------+----------+----------+----------+-----------+-------+-------+
$ openstack resource provider inventory list
0605bd29-71d5-40ed-ab8f-eceeaaac59b5
+----------------+------------------+----------+----------+----------+-----------+-------+------+
| resource_class | allocation_ratio | min_unit | max_unit | reserved |
step_size | total | used |
+----------------+------------------+----------+----------+----------+-----------+-------+------+
| VCPU | 16.0 | 1 | 8 | 0 |
1 | 8 | 0 |
| MEMORY_MB | 1.0 | 1 | 16008 | 2048 |
1 | 16008 | 0 |
| DISK_GB | 1.0 | 1 | 77 | 0 |
1 | 77 | 0 |
+----------------+------------------+----------+----------+----------+-----------+-------+------+
######## Hugepages: 1000 * 2M
root@juju-98fb61-zaza-d6f2c7825043-9:~# cat /proc/meminfo | grep -i huge
AnonHugePages: 622592 kB
ShmemHugePages: 0 kB
FileHugePages: 0 kB
HugePages_Total: 1000
HugePages_Free: 1000
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
Hugetlb: 2048000 kB
root@juju-98fb61-zaza-d6f2c7825043-9:~# free -mh
total used free shared buff/cache available
Mem: 15Gi 3.5Gi 11Gi 1.0Mi 713Mi 11Gi
Swap: 0B 0B 0B
######## Host reserved memory is 2G:
$ juju config nova-compute reserved-host-memory
2048
######## Available Mem for general use (not hugepage)
I expect to have available memory for VMs = 16008 (total) - 2048 (reserved) -
2048 (hugepages) = 11912
######## Flavor with mem 13960 (> of expected total available 11912)
$ os flavor show 14g-mem
+----------------------------+--------------------------------------+
| Field | Value |
+----------------------------+--------------------------------------+
| OS-FLV-DISABLED:disabled | False |
| OS-FLV-EXT-DATA:ephemeral | 0 |
| access_project_ids | None |
| description | None |
| disk | 20 |
| id | 377de58b-7aa2-499d-9940-abf98aaa5a8a |
| name | 14g-mem |
| os-flavor-access:is_public | True |
| properties | |
| ram | 13960 |
| rxtx_factor | 1.0 |
| swap | |
| vcpus | 2 |
+----------------------------+--------------------------------------+
###### VM with flavor 14g-mem is scheduled correctly (Expected No Valid host)
$ os server list -c ID -c Name -c Status -c "Flavor"
+--------------------------------------+---------+--------+---------+
| ID | Name | Status | Flavor |
+--------------------------------------+---------+--------+---------+
| fd5c8bc9-22a6-4f5e-b745-026fa00e26ea | test-vm | ACTIVE | 14g-mem |
+--------------------------------------+---------+--------+---------+
** Project changed: nova => ubuntu
** Package changed: ubuntu => nova (Ubuntu)
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https://bugs.launchpad.net/bugs/1950186
Title:
Nova doesn't account for hugepages when scheduling VMs
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