[Bug 1878376] Re: instances with hugepages intermittently fail to start
James Page
james.page at ubuntu.com
Wed May 13 09:42:12 UTC 2020
This may be related to bug 1734204 but right now I can't actually
reproduce that bug on a Queens deployment
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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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