Istio's EnvoyFilter configuration to fix Nagle's Algorithm (40ms delay on TCP)

resource.yaml

apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
metadata:
  name: tcp-socket-options
  namespace: istio-system
spec:
  configPatches:
    - applyTo: LISTENER
      match:
        context: ANY
      patch:
        operation: MERGE
        value:
          listener_filters:
            - name: envoy.filters.listener.original_dst
              typed_config:
                "@type": type.googleapis.com/envoy.extensions.filters.listener.original_dst.v3.OriginalDst
          socket_options:
            - level: 1  # SOL_SOCKET
              name: 12  # SO_KEEPALIVE
              int_value: 1
            - level: 6  # IPPROTO_TCP
              name: 1   # TCP_NODELAY
              int_value: 1
            - level: 6  # IPPROTO_TCP
              name: 12  # TCP_QUICKACK
              int_value: 1