kubelet/dockerd consume a lot of CPU on Windows node

[zhiweiv]

What happened:
kubelet/dockerd consume a lot of CPU on Windows node, I guess the System interrupts cpu usage is also caused by them.

I was able to get pprof cpu profile from kubelet.

aks.pb.gz

What you expected to happen:
cpu usage for kubelet/dockerd are normal.

How to reproduce it (as minimally and precisely as possible):
Not sure, only one of our Windows nodes encounters this issue.

Environment:

• Kubernetes version (use kubectl version): 1.14.8
• Size of cluster (how many worker nodes are in the cluster?): 2 Linux nodes, 7 Windows nodes
• General description of workloads in the cluster: .net web/worker

[jluk]

Closing in favor of support request if still occurring.

[mikkelhegn]

@immuzz Can you confirm you're looking into this?

[immuzz]

@mikkelhegn Yes we are looking into this issue.