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refs/changes/82/893082/1 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.opendev.org/openstack/neutron refs/changes/82/893082/1"}}},"commit":{"parents":[{"commit":"6dc93c5072f586ffbf245e4740f314d3de1e95f1","subject":"[OVN][Trunk] Set the subports correct host during live migration","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/neutron/commit/6dc93c5072f586ffbf245e4740f314d3de1e95f1"}]}],"author":{"name":"Felix Huettner","email":"felix.huettner@mail.schwarz","date":"2023-03-01 15:14:18.000000000","tz":60},"committer":{"name":"Stefan Hoffmann","email":"stefan.hoffmann@cloudandheat.com","date":"2023-08-29 15:34:53.000000000","tz":120},"subject":"Reduce lock contention on subnets","message":"Reduce lock contention on subnets\n\nin [1] a lock was introduced with the goal of preventing subnets from\nbeing deleted while ports are being created in them in parallel.\nThis was acheived by aquiring an exclusive lock on the row of the\nsubnet in the Subnet table when adding/modifying a port or deleting\nthe subnet.\n\nHowever as this was a exclusive lock it also prevented concurrent port\nmodifications on the same subnet from happening. This can cause\nperformance issues on environment with large shared subnets (e.g. a\nlarge external subnet).\n\nTo reduce the lock contention for this case we split the lock in two\nparts:\n\n* For normal port operations we will aquire a shared lock on the\n  row of the subnet. This allows multiple such operations to happen in\n  parallel.\n* For deleting a subnet we will aquire an exclusive lock on the row of\n  the subnet. This lock can not be aquired when there is any shared\n  lock currently on the row.\n\nWith this we maintain the same locking level as before, but reduce the\namount of lock contention happening and thereby improve throughput.\n\nHINT: This isn\u0027t a clean backport, as we keep the subnet in-use field.\nWe can\u0027t backport the db update that would remove the field.\n\nThe performance improvement can be measured using rally test [2].\n(improving from 21 to 18 seconds).\nAlternatively it can be tested using 250 parallel curl calls to create a\nport in the same network. This improves from 113s to 42s.\n\n[1]: https://review.opendev.org/c/openstack/neutron/+/713045\n[2]: https://github.com/openstack/rally-openstack/blob/master/samples/tasks/scenarios/neutron/create-and-delete-ports.json\n\nCloses-Bug: #2009055\nChange-Id: I31b1a9c2f986f59fee0da265acebbd88d2f8e4f8\n(cherry picked from commit c0af5b3b5ea89d3147adf1054625f29d5b01b309)\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/neutron/commit/b8f74158399de645e050a6249ca854cdb6f8bcd5"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/neutron/commit/b8f74158399de645e050a6249ca854cdb6f8bcd5"}]},"branch":"refs/heads/stable/2023.1"},"c89d028a955721c8132ca23c44e84a59d5fd99ce":{"kind":"TRIVIAL_REBASE_WITH_MESSAGE_UPDATE","_number":2,"created":"2023-09-27 09:14:00.000000000","uploader":{"_account_id":26832,"name":"Stefan Hoffmann","email":"stefan.hoffmann@cloudandheat.com","username":"shoffmann"},"ref":"refs/changes/82/893082/2","fetch":{"anonymous http":{"url":"https://review.opendev.org/openstack/neutron","ref":"refs/changes/82/893082/2","commands":{"Checkout":"git fetch https://review.opendev.org/openstack/neutron refs/changes/82/893082/2 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://review.opendev.org/openstack/neutron refs/changes/82/893082/2 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://review.opendev.org/openstack/neutron refs/changes/82/893082/2 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.opendev.org/openstack/neutron refs/changes/82/893082/2"}}},"commit":{"parents":[{"commit":"493bfd0554f0357ca5b9d55aff7b193f55dfd3e8","subject":"Merge \"Check the device ID and host ID during virtual port binding\" into stable/2023.1","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/neutron/commit/493bfd0554f0357ca5b9d55aff7b193f55dfd3e8"}]}],"author":{"name":"Felix Huettner","email":"felix.huettner@mail.schwarz","date":"2023-03-01 15:14:18.000000000","tz":60},"committer":{"name":"Stefan Hoffmann","email":"stefan.hoffmann@cloudandheat.com","date":"2023-09-27 09:13:49.000000000","tz":120},"subject":"Reduce lock contention on subnets","message":"Reduce lock contention on subnets\n\nHINT: This isn\u0027t a clean backport, as we keep the subnet in-use field.\nWe can\u0027t backport the db update that would remove the field.\n\nin [1] a lock was introduced with the goal of preventing subnets from\nbeing deleted while ports are being created in them in parallel.\nThis was acheived by aquiring an exclusive lock on the row of the\nsubnet in the Subnet table when adding/modifying a port or deleting\nthe subnet.\n\nHowever as this was a exclusive lock it also prevented concurrent port\nmodifications on the same subnet from happening. This can cause\nperformance issues on environment with large shared subnets (e.g. a\nlarge external subnet).\n\nTo reduce the lock contention for this case we split the lock in two\nparts:\n\n* For normal port operations we will aquire a shared lock on the\n  row of the subnet. This allows multiple such operations to happen in\n  parallel.\n* For deleting a subnet we will aquire an exclusive lock on the row of\n  the subnet. This lock can not be aquired when there is any shared\n  lock currently on the row.\n\nWith this we maintain the same locking level as before, but reduce the\namount of lock contention happening and thereby improve throughput.\n\nThe performance improvement can be measured using rally test [2].\n(improving from 21 to 18 seconds).\nAlternatively it can be tested using 250 parallel curl calls to create a\nport in the same network. This improves from 113s to 42s.\n\n[1]: https://review.opendev.org/c/openstack/neutron/+/713045\n[2]: https://github.com/openstack/rally-openstack/blob/master/samples/tasks/scenarios/neutron/create-and-delete-ports.json\n\nCloses-Bug: #2009055\nChange-Id: I31b1a9c2f986f59fee0da265acebbd88d2f8e4f8\n(cherry picked from commit c0af5b3b5ea89d3147adf1054625f29d5b01b309)\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/neutron/commit/c89d028a955721c8132ca23c44e84a59d5fd99ce"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/neutron/commit/c89d028a955721c8132ca23c44e84a59d5fd99ce"}]},"branch":"refs/heads/stable/2023.1"}},"requirements":[],"submit_records":[{"rule_name":"gerrit~DefaultSubmitRule","status":"CLOSED","labels":[{"label":"Verified","status":"MAY","applied_by":{"_account_id":22348,"name":"Zuul","username":"zuul","tags":["SERVICE_USER"]}},{"label":"Code-Review","status":"MAY","applied_by":{"_account_id":1131,"name":"Brian Haley","email":"haleyb.dev@gmail.com","username":"brian-haley"}},{"label":"Workflow","status":"MAY","applied_by":{"_account_id":1131,"name":"Brian Haley","email":"haleyb.dev@gmail.com","username":"brian-haley"}},{"label":"Review-Priority","status":"MAY"}]}],"submit_requirements":[{"name":"Verified","description":"Verified in gate by CI","status":"SATISFIED","is_legacy":false,"submittability_expression_result":{"expression":"label:Verified\u003dMAX AND -label:Verified\u003dMIN","fulfilled":true,"status":"PASS","passing_atoms":["label:Verified\u003dMAX"],"failing_atoms":["label:Verified\u003dMIN"],"atom_explanations":{}}},{"name":"Code-Review","description":"Code reviewed by core reviewer","status":"SATISFIED","is_legacy":false,"submittability_expression_result":{"expression":"label:Code-Review\u003dMAX AND -label:Code-Review\u003dMIN","fulfilled":true,"status":"PASS","passing_atoms":["label:Code-Review\u003dMAX"],"failing_atoms":["label:Code-Review\u003dMIN"],"atom_explanations":{}}},{"name":"Review-Priority","description":"Review priority","status":"SATISFIED","is_legacy":false,"submittability_expression_result":{"expression":"-label:Review-Priority\u003dMIN","fulfilled":true,"status":"PASS","passing_atoms":[],"failing_atoms":["label:Review-Priority\u003dMIN"],"atom_explanations":{}}},{"name":"Workflow","description":"Approved for gate by core reviewer","status":"SATISFIED","is_legacy":false,"submittability_expression_result":{"expression":"label:Workflow\u003dMAX AND -label:Workflow\u003dMIN","fulfilled":true,"status":"PASS","passing_atoms":["label:Workflow\u003dMAX"],"failing_atoms":["label:Workflow\u003dMIN"],"atom_explanations":{}}}]}