KNative serving with Istio ingress- Revision timeoutSeconds doesnt have any effect.

[msgurikar]

HI,
We are using KNative serving 1.11.1 with Istio Ingress gateway. We have service running for more than 7 mins without sending any status back to client. I have configured revision timeoutseconds as 1000 seconds, but i still get stream time out error on the client side after 5 minutes. We have set max revision timeout as 2400. How do i check, why my queue-proxy is not using revision timeout seconds.
Here is my service yaml:

apiVersion: serving.knative.dev/v1
kind: Service
metadata:
name: test-service
namespace: testsvc
spec:
template:
metadata:
name: test-service-latest
annotations:
autoscaling.knative.dev/class: kpa.autoscaling.knative.dev
autoscaling.knative.dev/targetUtilizationPercentage: "100"
autoscaling.knative.dev/minScale: "1"
autoscaling.knative.dev/maxScale: "80"
autoscaling.knative.dev/scaleDownDelay: "30m"

spec:
  containerConcurrency: 1
  timeoutSeconds: 1000
  nodeSelector:
    kubernetes.io/os: linux
    algo : qiefp-linux-F16s_v2
  containers:       
  - image: wpsacr.azurecr.io/bis/testservice_res:latest
    imagePullPolicy: Always
    resources:
      requests:
        cpu: 950m
        memory: 1950Mi
      limits:
        cpu: 1000m
        memory: 2000Mi