Skip backoff when PodMaxBackoffDuration is set to zero

pkg/scheduler/backend/queue/backoff_queue.go

@@ -218,6 +218,10 @@ func (bq *backoffQueue) isPodBackingoff(podInfo *framework.QueuedPodInfo) bool {
 // because of the fact that the backoff time is calculated based on podInfo.Attempts,
 // which doesn't get changed until the pod's scheduling is retried.
 func (bq *backoffQueue) getBackoffTime(podInfo *framework.QueuedPodInfo) time.Time {
+	if bq.podMaxBackoff == 0 {
+		// If podMaxBackoff is set to 0, the backoff should be disabled completely.
+		return time.Time{}
+	}
 	count := podInfo.UnschedulableCount
 	if podInfo.ConsecutiveErrorsCount > 0 {
 		// This Pod has experienced an error status at the last scheduling cycle,

pkg/scheduler/backend/queue/backoff_queue_test.go

@@ -67,6 +67,13 @@ func TestBackoffQueue_getBackoffTime(t *testing.T) {
 			podInfo:                &framework.QueuedPodInfo{UnschedulableCount: 5, ConsecutiveErrorsCount: 16, Timestamp: time.Date(2023, 10, 1, 0, 0, 0, 0, time.UTC)},
 			want:                   time.Date(2023, 10, 1, 0, 0, 32, 0, time.UTC),
 		},
+		{
+			name:                   "zero maxBackoffDuration means no backoff",
+			initialBackoffDuration: 0,
+			maxBackoffDuration:     0,
+			podInfo:                &framework.QueuedPodInfo{UnschedulableCount: 16, Timestamp: time.Date(2023, 10, 1, 0, 0, 0, 0, time.UTC)},
+			want:                   time.Time{},
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {