sys-kernel/coreos-modules: Enable Netkit flag

[timbuchwaldt]

Enable Netkit flag

Enable the netkit config flag, closes flatcar/Flatcar#1959

How to use

Load netkit module, enjoy Cilium performance improvements.

Testing done

[Describe the testing you have done before submitting this PR. Please include both the commands you issued as well as the output you got.]

• Changelog entries added in the respective changelog/ directory (user-facing change, bug fix, security fix, update)
• Inspected CI output for image differences: /boot and /usr size, packages, list files for any missing binaries, kernel modules, config files, kernel modules, etc.

[tormath1]

Images are available here: https://github.com/flatcar/scripts/actions/runs/19855010770?pr=3524

and netkit is enabled:

$ zgrep -i netkit /proc/config.gz
CONFIG_NETKIT=y

Two tests are failing but it's unrelated (because the PR comes from a fork).

@timbuchwaldt any chance to try the provided images?

[chewi]

Will this make our Cilium tests more reliable? 🤔

[tormath1]

Will this make our Cilium tests more reliable? 🤔

Not really, it seems it has to be explicitely opt-in. What we can do is to add a variant to our Cilium Kubernetes tests to test netkit, similar to this: https://github.com/flatcar/mantle/blob/c4e298d8328977f03869d2f73ddd4c61cc836a0d/kola/tests/kubeadm/kubeadm.go#L50-L54

[timbuchwaldt]

Currently out sick from work, will have a look at testing once back

[timbuchwaldt]

Can one trigger a rebuild? Came back, but images got GCed 🙈 @tormath1 @chewi

[tormath1]

Can one trigger a rebuild? Came back, but images got GCed 🙈 @tormath1 @chewi

Hey, the images are now back here: https://github.com/flatcar/scripts/actions/runs/19855010770 (thanks @chewi for triggering the builds)

[timbuchwaldt]

I finally managed to play with it a bit, and netkit works! From my side this is good to go!