Troubleshooting the OVNKubernetesNodeOVSOverflowKernel alarm
Updated -
Background
What are OVS upcalls?
When a packet is processed by Open vSwitch (OVS), it is checked against a flow table in the kernel. If no matching rule is found, the packet is sent to the userspace daemon (ovs-vswitchd) through several Netlink sockets. This process is called an upcall.
In ovs-vswitchd, multiple handler threads read t...
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