[Expired for OpenStack Compute (nova) because there has been no activity
for 60 days.]
** Changed in: nova
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1528325
Title:
instance with explicit "small" pages treated different from implicit
Status in OpenStack Compute (nova):
Expired
Bug description:
In numa_get_constraints() we call
pagesize = _numa_get_pagesize_constraints(flavor, image_meta)
then later we have
if nodes or pagesize:
<skip>
[setattr(c, 'pagesize', pagesize) for c in numa_topology.cells]
This ends up treating an instance which doesn't specify pagesize (which
results in 4K pages) differently from an instance that explicitly specifies 4K
pages. In the first case the instance may not have a numa topology specified,
while in the second case it does.
In _get_guest_numa_config() we check whether the guest has a numa
topology, and if it does we restrict it to a single NUMA node rather
than letting it float across the whole host. This unexpectedly
results in different CPU and memory affinity depending on whether an
instance implicitly assumes 4K pages or explicitly specifies them.
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