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) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1950186 Title: Nova doesn't account for hugepages when scheduling VMs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nova/+bug/1950186/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs