** Changed in: linux-bluefield (Ubuntu Focal)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1934401
Title:
Control netfilter flow table timeouts via sysctl
Status in linux-bluefield package in Ubuntu:
Invalid
Status in linux-bluefield source package in Focal:
Fix Committed
Bug description:
* Explain the bug(s)
TCP and UDP connections may be offloaded from nf conntrack to nf flow table.
Offloaded connections are aged after 30 seconds of inactivity.
Once aged, ownership is returned to conntrack with a hard coded tcp/udp
pickup time of 120/30 seconds, after which the connection may be deleted.
The current hard-coded pickup intervals may introduce a very
aggressive aging policy. For example, offloaded tcp connections in
established state will timeout from nf conntrack after just 150
seconds of inactivity, instead of 5 days. In addition, the hard-coded
30 second offload timeout period can significantly increase the
hardware insertion rate requirements in some use cases.
* Brief explanation of fixes
This patchset provides the user with the ability to configure protocol
specific offload timeout and pickup intervals via sysctl.
The first and second patches revert the existing non-upstream solution.
The next two patches introduce the sysctl configuration for tcp and udp
protocols.
The last patch modifies nf flow table aging mechanisms to use the configured
time intervals.
* How to test
Control tcp/udp connection timeout using the following sysctl parameters:
net.netfilter.nf_flowtable_tcp_pickup = 120
net.netfilter.nf_flowtable_tcp_timeout = 30
net.netfilter.nf_flowtable_udp_pickup = 30
net.netfilter.nf_flowtable_udp_timeout = 30
* What it could break.
Existing configuration scripts – not kernel related
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