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Message #87346
[Bug 1946318] [NEW] [ovn] Memory consumption grows over time due to MAC_Binding entries in SB database
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
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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
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