Public bug reported: MAC_Binding entries are used in OVN as a mechanism to learn MAC addresses on logical ports and avoid sending ARP requests to the network.
There is no aging mechanism for these entries [0] and the table can grow indefinitely. In environments with for example large (eg. /16) external networks; OVN may learn a considerable amount of addresses growing the size of the db a lot. Today, Neutron monitors this table to workaround the lack of aging mechanism and remove the MAC_Binding entries associated to Floating IPs and each neutron-server worker will keep an in-memory copy of such table increasing its memory footprint to several Gigabytes, eventually leading to OOM killers. [0] https://mail.openvswitch.org/pipermail/ovs- discuss/2019-June/048936.html ** Affects: neutron Importance: Undecided Status: New -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to neutron. https://bugs.launchpad.net/bugs/1946318 Title: [ovn] Memory consumption grows over time due to MAC_Binding entries in SB database Status in neutron: New Bug description: MAC_Binding entries are used in OVN as a mechanism to learn MAC addresses on logical ports and avoid sending ARP requests to the network. There is no aging mechanism for these entries [0] and the table can grow indefinitely. In environments with for example large (eg. /16) external networks; OVN may learn a considerable amount of addresses growing the size of the db a lot. Today, Neutron monitors this table to workaround the lack of aging mechanism and remove the MAC_Binding entries associated to Floating IPs and each neutron-server worker will keep an in-memory copy of such table increasing its memory footprint to several Gigabytes, eventually leading to OOM killers. [0] https://mail.openvswitch.org/pipermail/ovs- discuss/2019-June/048936.html To manage notifications about this bug go to: https://bugs.launchpad.net/neutron/+bug/1946318/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : [email protected] Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp
