jdk21 virtual thread ArrayBlockingQueue.take() occupy many of CPU

Question

I'm using netty websocket dispatch message to custom virtual thread executor.

Network layer as this:

1. receive message: Client -> netty websocket channel -> disruptor ringbuff -> ArrayBlockingQueue -> virtual thread logic handler loop
2. reponse message: virtual thread -> disruptor ringbuff -> netty websocket channel

The scenario is send echo benchmark from client <-> server

ArrayBlockingQueue work like this snippet in server:

 def routing(queue: ArrayBlockingQueue[InputMsg]): Unit = {
    var inputMsg: InputMsg = null
    while (true) {
      inputMsg = queue.take()
      // just simple response echo.
    }
  }

Besides, every websocket connection will new itself ArrayBlockingQueue. There no many concurrrecy racing on take method.

I'm profiling there with JProfiler are a lot CPU time cost on queue.take(). But doesn't it should be unmounted when block? and why not show the time cost on virtual thread underlying switch rather then take method.