krunkit: Disable offloading for faster networking

[nirs]

krunkit-1.0.0[1] allows disabling offloading for faster networking. Keep the Offloading option in case offloading is improved in future versions or we want to add a flag to use int for specific workload.

Testing shows 6.7 times faster network performance, and 9p mount is 3 times faster.

Starting cluster:

% minikube start --driver krunkit --container-runtime containerd
😄  minikube v1.36.0 on Darwin 15.6 (arm64)
✨  Using the krunkit (experimental) driver based on user configuration
👍  Starting "minikube" primary control-plane node in "minikube" cluster
🔥  Creating krunkit VM (CPUs=2, Memory=6144MB, Disk=20000MB) ...
📦  Preparing Kubernetes v1.33.2 on containerd 1.7.23 ...
🔗  Configuring bridge CNI (Container Networking Interface) ...
🔎  Verifying Kubernetes components...
    ▪ Using image gcr.io/k8s-minikube/storage-provisioner:v5
🌟  Enabled addons: default-storageclass, storage-provisioner
🏄  Done! kubectl is now configured to use "minikube" cluster and "default" namespace by default

Testing iperf3:

% kubectl apply -f iper3-server.yaml
deployment.apps/iperf3 created
service/iperf3 created

% kubectl get deploy iperf3
NAME     READY   UP-TO-DATE   AVAILABLE   AGE
iperf3   1/1     1            1           9s

% kubectl get service iperf3
NAME     TYPE       CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE
iperf3   NodePort   10.105.127.180   <none>        5201:30201/TCP   17s

% iperf3 -c $(minikube ip) -p 30201
Connecting to host 192.168.105.10, port 30201
[  5] local 192.168.105.1 port 50630 connected to 192.168.105.10 port 30201
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-1.00   sec  1.05 GBytes  9.03 Gbits/sec
[  5]   1.00-2.01   sec  1.09 GBytes  9.29 Gbits/sec
[  5]   2.01-3.01   sec  1.06 GBytes  9.09 Gbits/sec
[  5]   3.01-4.00   sec  1.08 GBytes  9.33 Gbits/sec
[  5]   4.00-5.00   sec  1.08 GBytes  9.31 Gbits/sec
[  5]   5.00-6.00   sec  1.07 GBytes  9.23 Gbits/sec
[  5]   6.00-7.00   sec  1.09 GBytes  9.35 Gbits/sec
[  5]   7.00-8.01   sec  1.08 GBytes  9.20 Gbits/sec
[  5]   8.01-9.00   sec  1.07 GBytes  9.18 Gbits/sec
[  5]   9.00-10.01  sec  1.08 GBytes  9.28 Gbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-10.01  sec  10.7 GBytes  9.23 Gbits/sec                  sender
[  5]   0.00-10.01  sec  10.7 GBytes  9.23 Gbits/sec                  receiver

Testing 9p mount:

% minikube mount ~/models:/mnt/models
📁  Mounting host path /Users/nir/models into VM as /mnt/models ...
    ▪ Mount type:   9p
    ▪ User ID:      docker
    ▪ Group ID:     docker
    ▪ Version:      9p2000.L
    ▪ Message Size: 262144
    ▪ Options:      map[]
    ▪ Bind Address: 192.168.105.1:50614
🚀  Userspace file server:
ufs starting
✅  Successfully mounted /Users/nir/models to /mnt/models

📌  NOTE: This process must stay alive for the mount to be accessible ...

$ time cat /mnt/models/DeepSeek-R1-0528-Qwen3-8B-Q4_K_M.gguf >/dev/null

real    0m10.219s
user    0m0.007s
sys     0m0.263s

[1] https://github.com/containers/krunkit/releases/tag/v1.0.0

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[nirs]

@medyagh this is ready for merge

[medyagh]

/ok-to-test

[medyagh]

can merge after full tests are back :)

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: medyagh, nirs

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[minikube-pr-bot]

kvm2 driver with docker runtime

┌────────────────┬──────────┬────────────────────────┐
│    COMMAND     │ MINIKUBE │ MINIKUBE  ( PR 21341 ) │
├────────────────┼──────────┼────────────────────────┤
│ minikube start │ 49.1s    │ 48.9s                  │
│ enable ingress │ 15.4s    │ 15.6s                  │
└────────────────┴──────────┴────────────────────────┘

Times for minikube start: 51.2s 46.7s 47.5s 48.5s 51.5s
Times for minikube (PR 21341) start: 49.8s 47.9s 49.9s 49.6s 47.5s

Times for minikube ingress: 14.8s 15.8s 15.8s 15.8s 14.8s
Times for minikube (PR 21341) ingress: 15.8s 15.8s 15.8s 14.8s 15.8s

docker driver with docker runtime

┌────────────────┬──────────┬────────────────────────┐
│    COMMAND     │ MINIKUBE │ MINIKUBE  ( PR 21341 ) │
├────────────────┼──────────┼────────────────────────┤
│ minikube start │ 24.3s    │ 23.5s                  │
│ enable ingress │ 14.4s    │ 15.3s                  │
└────────────────┴──────────┴────────────────────────┘

Times for minikube ingress: 13.6s 12.7s 13.6s 18.6s 13.6s
Times for minikube (PR 21341) ingress: 13.6s 13.6s 18.7s 17.6s 13.1s

Times for minikube start: 22.1s 22.8s 27.3s 22.9s 26.2s
Times for minikube (PR 21341) start: 22.2s 23.8s 25.9s 23.2s 22.5s

docker driver with containerd runtime

┌────────────────┬──────────┬────────────────────────┐
│    COMMAND     │ MINIKUBE │ MINIKUBE  ( PR 21341 ) │
├────────────────┼──────────┼────────────────────────┤
│ minikube start │ 22.1s    │ 22.8s                  │
│ enable ingress │ 30.5s    │ 24.7s                  │
└────────────────┴──────────┴────────────────────────┘

Times for minikube start: 21.9s 23.1s 22.2s 22.6s 20.8s
Times for minikube (PR 21341) start: 24.0s 22.8s 21.1s 21.7s 24.7s

Times for minikube ingress: 24.2s 40.1s 40.1s 24.1s 24.1s
Times for minikube (PR 21341) ingress: 24.1s 24.1s 23.6s 24.1s 27.6s