Tim u mean the backend for k8s node is same as the result of the backend on
native tomcat test as well as on the docker.
k8s node backend is different that the tomcat and docker test.
Tomcat/docker test did on the GCP machine with ubuntu flavour with
8cpu/30Gig machine
k8s test did on 3 node k8s backend with default cos (container optimised
OS).
On Tuesday, September 19, 2017 at 9:59:52 PM UTC+5:30, Tim Hockin wrote:
>
> NodePort vs VIP should have no difference - they traverse the same paths.
>
> This is a much steeper difference than what I measured and more than I
> would expect.
>
> Is this 8k new connections per second? Could you be exhausting
> conntrack records and getting some failures? It would be interesting
> to distinguish connections per second vs request throughput. We
> should also clarify whether this is to a single backend on the same
> node, or if this is across multiple backends and nodes. Testing to a
> backend on the same node should, of course, be faster than testing a
> backend on a different node.
>
> On Tue, Sep 19, 2017 at 8:55 AM, Warren Strange
> <warren....@gmail.com <javascript:>> wrote:
> >
> > Debugging performance issues on Docker/Kube can be interesting....
> >
> > You could try exposing the service through a Nodeport, and run your
> > benchmark directly against the node IP. That would at least tell you if
> the
> > GKE LB is a factor or not.
> >
> > Also - are your pods possibly CPU or memory limited (i.e, have you
> > explicitly set resource limits - making Kube throttle your pods?)
> >
> >
> > Please share your findings!
> >
> >
> > On Tuesday, September 19, 2017 at 12:25:05 AM UTC-6, Vinoth Narasimhan
> > wrote:
> >>
> >> Environment:
> >>
> >> Kubernetes version (use kubectl version):
> >> kubectl version
> >> Client Version: version.Info{Major:"1", Minor:"7", GitVersion:"v1.7.3",
> >> GitCommit:"2c2fe6e8278a5db2d15a013987b53968c743f2a1",
> GitTreeState:"clean",
> >> BuildDate:"2017-08-03T07:00:21Z", GoVersion:"go1.8.3", Compiler:"gc",
> >> Platform:"linux/amd64"}
> >> Server Version: version.Info{Major:"1", Minor:"6", GitVersion:"v1.6.9",
> >> GitCommit:"a3d1dfa6f433575ce50522888a0409397b294c7b",
> GitTreeState:"clean",
> >> BuildDate:"2017-08-23T16:58:45Z", GoVersion:"go1.7.6", Compiler:"gc",
> >> Platform:"linux/amd64"}
> >>
> >> Cloud provider or hardware configuration**:
> >>
> >> Google Container Engine.
> >>
> >> What happened:
> >>
> >> We are in testing phase of springboot based microservice deployment on
> >> GKE. During testing QA filed a performance issue , stats that the
> throughput
> >> of the service in k8s is low when compared to run the java app in
> >>
> >> java -jar method
> >> docker run
> >> For testing i skip those springboot stuff and take native tomcat home
> page
> >> as the test bed for the "ab" testing.
> >>
> >> The test setup looks like:
> >>
> >> Create an 8cpu/30Gig RAM ubuntu server in GCP and install native
> >> tomact-8.5.20(80) and test the home page.
> >>
> >> Stop the native tomcat. Create the docker tomcat instances on the same
> >> host and test the same home page.
> >> The docker version is: Version: 17.06.2-ce
> >>
> >> Create the 3 node K8s cluster 1.6.9. Run the tomcat deployment the same
> >> 8.5.20 and expose the service through LB and test the same home page.
> >>
> >> I install the ab tool in other GCP instances and hit the above 3
> different
> >> endpoints.
> >>
> >> What's the Result:
> >>
> >> The first 2 test with native tomcat and docker run the throughput i got
> is
> >> nearly 8k Req/sec on avg on different request/concurrent level.
> >>
> >> But the same on K8s LB the throughput i got on the average of 2k
> req/sec
> >> on avg on different request/concurrency level.
> >>
> >> Is this something am i missing on the test. Or this is how the GKE LB
> >> store and forward the request at this rate.
> >
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