Would you mind file an issue on github?
On Thursday, July 20, 2017 at 6:33:07 AM UTC-7, theairkit wrote:
> Hi
>
>
> I've encountered a pod network latency problem.
>
>
> I run simple mysql query ('time mysql -e "..."') to outer
> (not in k8s cluster) host and got following results:
>
>
> 1. From k8s-pod to outer host:
> avg time: 60ms
> worst time: 100ms
> (So, running applications in pods has same latency when works to outer
> resources)
>
>
> 2. From k8s-host (which contains pod above) to outer host:
> avg time: 10ms
> worst time: 20ms
>
>
> Also:
> - There are no any dependency on DNS: avg and worst times not changed
> when mysql-cli connects to IP-address or hostname of outer host.
> - There are enough free resources: typical k8s node have 56-cores CPU
> with LA ~ 10 (CPU load only and no any I/O load), more than half free
> memory,
> and no threads/processes (user/kernel), which cosume up to 100% cpu time.
>
>
> As a possible solution I divided CPUs between kernel and user processes
> (via kernel parameter isolcpus and cgroups), but latency did not changes.
>
>
> For now I perform more complex measurements, and trying to investigate
> which subsytem (k8s, cni, iptables etc.) may leads to this behaviour.
>
>
> Have you encountered such or similar behavior?
> May you provide any tip for my investigations?
>
>
> Would be very grateful for your help.
>
>
>
>
> My k8s cluster:
>
>
> kubelet version: 1.5.7
> network type: calico, image: calico/cni:v1.5.5, quay.io/calico/node:v1.0.0
> num of nodes: ~20
> pods per node: ~30
>
>
> OS: Debian GNU/Linux 8.6 (jessie)
> Kernel: 4.9.0-0.bpo.2-amd64
>
>
>
>
> Thanks!
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