VM migration: Reduce downtime using LSP IFSTATE #4774
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Doing so will allow dynamically controlling the LSP during cases like vm live migration in order to optimize downtime. This will be introduced in future commits. Signed-off-by: Ram Lavi <ralavi@redhat.com>
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Keeping PR as draft until adding unit tests |
currently all pods have the LSP.Enabled option set to true by default. During migration, it makes sense to handoff the network traffic from the source to target pod as soon as the target pod is up and ready for traffic. The handoff is done by closing the LSP of the source port. Doing this significantly reduces the migration downtime. This traffic handoff optimization is currently restricted to VM with only secondary interfaces, and layer2 topology. Signed-off-by: Ram Lavi <ralavi@redhat.com>
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/cc @qinqon Could you take this for a drive, and check if this matches your expectations ? |
sure. |
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What this PR does and why is it needed
Ccurrently all pods have the LSP.Enabled option set to true by default.
During migration, it makes sense to handoff the network traffic from the
source to target pod as soon as the target pod is up and ready for
traffic.
This PR is performing this handoff by closing the LSP of the source port.
Doing this significantly reduces the migration downtime.
This traffic handoff optimization is currently restricted to VM with
only secondary interfaces, and layer2 topology.
Which issue(s) this PR fixes
Fixes #
Special notes for reviewers
How to verify it
Run migration tests.
Details to documentation updates
Migration downtime results:
pre-copy:
post-copy:
Description for the changelog
Does this PR introduce a user-facing change?