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TX Packets dropped on flannel.1 #1009

discostur opened this Issue Jun 22, 2018 · 1 comment


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discostur commented Jun 22, 2018


we are running a 14 node k8s cluster with flannel (backend: vxlan) and we are seeing some packet drops on the flannel.1 interface:

        TX packets 416348507  bytes 685679045151 (638.5 GiB)
        TX errors 0  dropped 402 overruns 0  carrier 0  collisions 0

Under normal load (cpu about 20%) we are seeing 0.01pps getting dropped. If we are running some high traffic tests with iperf the dropping rate increases up to 1pps.

We are seeing this behaviour also on smaller clusters with only 3 oder 5 nodes.

Your Environment

  • Flannel version: 0.10.0
  • Backend used (e.g. vxlan or udp): vxlan
  • Etcd version: 3.2.15
  • Kubernetes version (if used): 1.10.2
  • Operating System and version: centos7.5

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andyzasl commented Oct 26, 2018

Have same issue on debian 9 with kernel 4.9.110-3+deb9u5

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