libvirt: Create option to enable parallel live migration
With increasing network speed, live-migration becomes quickly CPU bound.
QEMU introduced with 2.11 multifd, and libvirt with 5.2.0 VIR_MIGRATE_
options to parallelise the migration with multiple threads.
Since both versions precede the current minimum versions, there are no additional
requirements, and we simply can expose the feature as a configuration options to
the administrator with a default value that preserves the existing behaviour.
The configuration just needs to be set on the source host to take an effect, so no orchestration
of the change is needed.
The default could be
`[libvirt]
which would
- not set the `VIR_MIGRATE_
- and neither pass the option `parallel.
keeping the existing behavior.
Blueprint information
- Status:
- Complete
- Approver:
- Uggla
- Priority:
- Undefined
- Drafter:
- Fabian Wiesel
- Direction:
- Needs approval
- Assignee:
- Fabian Wiesel
- Definition:
- Superseded
- Series goal:
- Accepted for 2025.2
- Implementation:
-
Deferred
- Milestone target:
- None
- Started by
- Completed by
- Uggla
Related branches
Related bugs
Sprints
Whiteboard
Addressed by: https:/
libvirt: Expose number of migration threads
[2025MMDD Uggla] approved SLBP for Flamingo
sean: ah ok becasue there is a spec for it so i was expecting this to be next cycle
https:/
but i guess we can try and review it in time.
the deadlien for specless bluerpint to be approve was milestone 2.
[20250829 Uggla] Spec is deferred. Sadly we missed the review of that one. :(
[20251107 Uggla] This BP is replaced by this one: https:/
