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  1. Multiple Architecture Enablement
  2. MULTIARCH-4632

UDP aggregation is disabled on s390x


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    • Resolution: Unresolved
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    • IBM Z Dev
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      Description of problem:

      UDP aggregation on s390x is disabled. This was done, because changing the interface feature did not work in the past (https://issues.redhat.com/browse/OCPBUGS-2532).
      We have implemented a change in openshift/ovn-kubernetes (https://issues.redhat.com/browse/OCPBUGS-18935) that makes the used Go library safchain/ethtool able to change the interface features on s390x, so enabling UDP aggregation should now be possible for s390x nodes. Our proposed change is: https://github.com/openshift/cluster-network-operator/pull/2331 - this fix still needs to be verified end-to-end with a payload that includes all fixes.

      Version-Release number of selected component (if applicable):


      How reproducible:

      Always, it is disabled in code:

      Steps to Reproduce:

          1. Install OpenShift cluster on s390x with OVN-Kubernetes

      Actual results:

      Interface feature rx-udp-gro-forwarding is disabled.

      Expected results:

      Interface feature rx-udp-gro-forwarding is enabled.    

      Additional info:

      There is a config map for disabling the interface feature if needed (namespace openshift-network-operator, config map udp-aggregation-config, value disable-udp-aggregation = "true" disables UDP aggregation). This should be kept.


            dwerle Dominik Werle
            dwerle Dominik Werle
            Muhammad Adeel
            Doug Slavens Doug Slavens
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