Hi Erik, Thx for picking up my questions…
We’re using OCP v3.1 and the openshift-sdn. Both IP and DNS name of containers are used in the tests. If it can help, I can include more detailed test results in various scenarios. Do you think a newer version of ocp will improve on this ? thx ! Kind regards, Erik From: Erik Jacobs [mailto:[email protected]] Sent: maandag 10 april 2017 22:45 To: Roosemeyers Erik <[email protected]> Cc: [email protected] Subject: Re: high tcp retransmissions between pods on same openshift node Hi Erik, Are you using openshift-sdn or multitenant-sdn or something else? Are you running OpenShift Container Platform 3.1? Are you just communicating with the pod IP directly? --- ERIK JACOBS PRINCIPAL TECHNICAL MARKETING MANAGER, OPENSHIFT Red Hat Inc<https://www.redhat.com/> [email protected]<mailto:[email protected]> M: 646.462.3745<tel:646.462.3745> @: erikonopen [https://www.redhat.com/files/brand/email/sig-redhat.png]<https://red.ht/sig> TRIED. TESTED. TRUSTED.<https://redhat.com/trusted> On Tue, Mar 28, 2017 at 4:27 AM, Roosemeyers Erik <[email protected]<mailto:[email protected]>> wrote: Hi all, I'm testing network connectivity (speed and reliability) on a OpenShift cluster 3.1. I do this with 2 pods, each based on iperf3 Docker image. First pod starts iperf3 as server, other one as iperf3 client with: iperf3 -c iperf3 -t 120 (iperf3 name of server pod). What I notice is high throughput but also big retransmission rates: eg. duration Transfer Bandwidth Retransmissions (TCP) 0.00-120.00 sec 214 GBytes 15.3 Gbits/sec 170478 If the pods are on 2 different nodes, the retransmission rate is smaller (as is throughput): duration Transfer Bandwidth Retransmissions (TCP) 0.00-120.00 sec 22.6 GBytes 1.62 Gbits/sec 3627 What I was wondering - what causes this higher retransmission rates ? (Mostly, it's a sign the are network problems but is it ?) (I did some other tests, like deploying the containers via the Docker daemon onto 1 server. And even on a local laptop with only Docker daemon installed - and I always saw these tcp retransmission rates...) Thanks in advance ! kind regards, Erik _______________________________________________ dev mailing list [email protected]<mailto:[email protected]> http://lists.openshift.redhat.com/openshiftmm/listinfo/dev
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