[Bug 1878376] [NEW] instances with hugepages intermittently fail to start
James Page
james.page at ubuntu.com
Wed May 13 09:40:08 UTC 2020
Public bug reported:
Ubuntu 18.04 LTS + OpenStack Queens
Example flavour:
+----------------------------+--------------------------------------+
| Field | Value |
+----------------------------+--------------------------------------+
| OS-FLV-DISABLED:disabled | False |
| OS-FLV-EXT-DATA:ephemeral | 0 |
| access_project_ids | None |
| disk | 0 |
| id | 9f3946cc-df0c-468a-80a9-808702d9a620 |
| name | 4c-8192m |
| os-flavor-access:is_public | True |
| properties | hw:mem_page_size='large' |
| ram | 8192 |
| rxtx_factor | 1.0 |
| swap | |
| vcpus | 4 |
+----------------------------+--------------------------------------+
*some* instance creation requests fail to start instances due to lack of
available hugepages on the numa node being targeted for the instance
(log data to follow). Workaround to alleviate this symptom has been to
split the flavor across to numa nodes using hw:numa_nodes=2 as an
additional property, which means the cores for the instance can be split
across the numa nodes on the hypervisor. This does have a performance
overhead.
** Affects: nova (Ubuntu)
Importance: Undecided
Status: Incomplete
** Description changed:
- Placeholder for more information
+ Ubuntu 18.04 LTS + OpenStack Queens
Example flavour:
+----------------------------+--------------------------------------+
| Field | Value |
+----------------------------+--------------------------------------+
| OS-FLV-DISABLED:disabled | False |
| OS-FLV-EXT-DATA:ephemeral | 0 |
| access_project_ids | None |
| disk | 0 |
| id | 9f3946cc-df0c-468a-80a9-808702d9a620 |
| name | 4c-8192m |
| os-flavor-access:is_public | True |
| properties | hw:mem_page_size='large' |
| ram | 8192 |
| rxtx_factor | 1.0 |
| swap | |
| vcpus | 4 |
+----------------------------+--------------------------------------+
*some* instance creation requests fail to start instances due to lack of
available hugepages on the numa node being targeted for the instance
(log data to follow). Workaround to alleviate this symptom has been to
split the flavor across to numa nodes using hw:numa_nodes=2 as an
additional property, which means the cores for the instance can be split
across the numa nodes on the hypervisor. This does have a performance
overhead.
** Changed in: nova (Ubuntu)
Status: New => Incomplete
--
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https://bugs.launchpad.net/bugs/1878376
Title:
instances with hugepages intermittently fail to start
Status in nova package in Ubuntu:
Incomplete
Bug description:
Ubuntu 18.04 LTS + OpenStack Queens
Example flavour:
+----------------------------+--------------------------------------+
| Field | Value |
+----------------------------+--------------------------------------+
| OS-FLV-DISABLED:disabled | False |
| OS-FLV-EXT-DATA:ephemeral | 0 |
| access_project_ids | None |
| disk | 0 |
| id | 9f3946cc-df0c-468a-80a9-808702d9a620 |
| name | 4c-8192m |
| os-flavor-access:is_public | True |
| properties | hw:mem_page_size='large' |
| ram | 8192 |
| rxtx_factor | 1.0 |
| swap | |
| vcpus | 4 |
+----------------------------+--------------------------------------+
*some* instance creation requests fail to start instances due to lack
of available hugepages on the numa node being targeted for the
instance (log data to follow). Workaround to alleviate this symptom
has been to split the flavor across to numa nodes using
hw:numa_nodes=2 as an additional property, which means the cores for
the instance can be split across the numa nodes on the hypervisor.
This does have a performance overhead.
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