e2e: use different QPS for BackendUpgrade test

.github/workflows/build_and_test.yaml

@@ -136,19 +136,24 @@ jobs:
         - version: v1.30.10
           ipFamily: ipv4
           profile: default
+          loadQPS: 1000
         - version: v1.31.6
           ipFamily: ipv4
           profile: default
+          loadQPS: 2000
         - version: v1.32.3
           ipFamily: ipv6  # only run ipv6 test on this version to save time
           profile: default
+          loadQPS: 3000
         # TODO: this's IPv4 first, need a way to test IPv6 first.
         - version: v1.33.0
           ipFamily: dual  # only run dual test on latest version to save time
           profile: default
+          loadQPS: 4000
         - version: v1.33.0
           ipFamily: dual  # only run dual test on latest version to save time
           profile: gateway-namespace-mode
+          loadQPS: 5000
     steps:
     - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683  # v4.2.2
     - uses: ./tools/github-actions/setup-deps
@@ -172,6 +177,9 @@ jobs:
         IP_FAMILY: ${{ matrix.target.ipFamily }}
         KUBE_DEPLOY_PROFILE: ${{ matrix.target.profile }}
         E2E_TIMEOUT: 1h
+        # use the loadQPS from the matrix to set the QPS for the E2E tests
+        # this is used to determine whether the flaky tests are due to load or not
+        E2E_BACKEND_UPGRADE_QPS: ${{ matrix.target.loadQPS }}
         NUM_WORKERS: 2
       run: make e2e
 

test/e2e/tests/backend_upgrade.go

@@ -24,6 +24,7 @@ import (
 	"sigs.k8s.io/gateway-api/conformance/utils/http"
 	"sigs.k8s.io/gateway-api/conformance/utils/kubernetes"
 	"sigs.k8s.io/gateway-api/conformance/utils/suite"
+	"sigs.k8s.io/gateway-api/conformance/utils/tlog"
 )
 
 func init() {
@@ -65,24 +66,23 @@ var BackendUpgradeTest = suite.ConformanceTest{
 			// will contain indication on success or failure of load test
 			loadSuccess := make(chan bool)
 
-			t.Log("Starting load generation")
+			tlog.Logf(t, "Starting load generation")
 			// Run load async and continue to restart deployment
 			go runLoadAndWait(t, suite.TimeoutConfig, loadSuccess, aborter, reqURL.String())
 
-			t.Log("Restarting deployment")
+			tlog.Logf(t, "Restarting deployment")
 			err = restartDeploymentAndWaitForNewPods(t, suite.TimeoutConfig, suite.Client, dp)
 
-			t.Log("Stopping load generation and collecting results")
+			tlog.Logf(t, "Stopping load generation and collecting results")
 			aborter.Abort(false) // abort the load either way
-
 			if err != nil {
-				t.Errorf("Failed to restart deployment")
+				tlog.Errorf(t, "Failed to restart deployment")
 			}
 
 			// Wait for the goroutine to finish
 			result := <-loadSuccess
 			if !result {
-				t.Errorf("Load test failed")
+				tlog.Errorf(t, "Load test failed")
 			}
 		})
 	},

test/e2e/tests/utils.go

@@ -241,10 +241,20 @@ func AlmostEquals(actual, expect, offset int) bool {
 // the done channel is used to notify caller of execution result
 // the execution may end due to an external abort or timeout
 func runLoadAndWait(t *testing.T, timeoutConfig config.TimeoutConfig, done chan bool, aborter *periodic.Aborter, reqURL string) {
+	qpsVal := os.Getenv("E2E_BACKEND_UPGRADE_QPS")
+	qps := 5000
+	if qpsVal != "" {
+		if v, err := strconv.Atoi(qpsVal); err == nil {
+			qps = v
+		} else {
+			tlog.Logf(t, "Invalid QPS value %s, using default %d", qpsVal, qps)
+		}
+	}
+
 	flog.SetLogLevel(flog.Error)
 	opts := fhttp.HTTPRunnerOptions{
 		RunnerOptions: periodic.RunnerOptions{
-			QPS: 5000,
+			QPS: float64(qps),
 			// allow some overhead time for setting up workers and tearing down after restart
 			Duration:   timeoutConfig.CreateTimeout + timeoutConfig.CreateTimeout/2,
 			NumThreads: 50,