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Message #95929
[Bug 2111899] [NEW] [RFE] Use stateless NAT rules for FIPs
Public bug reported:
Using stateless NAT in OVN should always be a better choice for FIPs
because it allows to avoid hitting conntrack, potentially improving NAT
performance. In particular, a DPDK deployment could improve its
performance by avoiding the NAT rules to hit the conntrack table.
This functionality was added to core OVN in [1] and was released in
v20.03.0.
NOTE: this functionality was integrated in Neutron in [2] and reverted
in [3]. This functionality was impacting seriously in the HW offloaded
environments because it was impossible to fully offload all NAT rules.
This RFE instead proposes to implement the same feature but conditional
via config parameter in the Neutron API configuration file.
[1]https://github.com/ovn-org/ovn/commit/5b7cc608c0c7b4b862bcb208f57a3086af6cce8a
[2]https://review.opendev.org/c/openstack/neutron/+/804807
[3]https://review.opendev.org/c/openstack/neutron/+/838776
** Affects: neutron
Importance: Wishlist
Assignee: Rodolfo Alonso (rodolfo-alonso-hernandez)
Status: New
** Tags: rfe
** Changed in: neutron
Assignee: (unassigned) => Rodolfo Alonso (rodolfo-alonso-hernandez)
** Changed in: neutron
Importance: Undecided => Wishlist
** Tags added: rfe
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https://bugs.launchpad.net/bugs/2111899
Title:
[RFE] Use stateless NAT rules for FIPs
Status in neutron:
New
Bug description:
Using stateless NAT in OVN should always be a better choice for FIPs
because it allows to avoid hitting conntrack, potentially improving
NAT performance. In particular, a DPDK deployment could improve its
performance by avoiding the NAT rules to hit the conntrack table.
This functionality was added to core OVN in [1] and was released in
v20.03.0.
NOTE: this functionality was integrated in Neutron in [2] and reverted
in [3]. This functionality was impacting seriously in the HW offloaded
environments because it was impossible to fully offload all NAT rules.
This RFE instead proposes to implement the same feature but
conditional via config parameter in the Neutron API configuration
file.
[1]https://github.com/ovn-org/ovn/commit/5b7cc608c0c7b4b862bcb208f57a3086af6cce8a
[2]https://review.opendev.org/c/openstack/neutron/+/804807
[3]https://review.opendev.org/c/openstack/neutron/+/838776
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