if (minSize <= sendBufferSize) {
            RdmaMemoryRegion region = availableSendRegions.poll();
            if (region != null) {
                region.getBuffer().clear();
                return region;
            }
        }
        
        // Allocate new buffer
        ByteBuffer buffer = ByteBuffer.allocateDirect(Math.max(minSize, sendBufferSize));

        if (minSize <= sendBufferSize) {
            RdmaMemoryRegion region = availableSendRegions.poll();
            if (region != null) {
                region.getBuffer().clear();
                return region;
            }
        }

        // Allocate new buffer
        ByteBuffer buffer = ByteBuffer.allocateDirect(Math.max(minSize, sendBufferSize));

        final int sendBufferSize = th.getSendBufferSize();
        if (this.smb2) {
            this.writeSize = sendBufferSize;
            this.writeSizeFile = sendBufferSize;
            return;
        }

        this.openFlags &= ~(SmbConstants.O_CREAT | SmbConstants.O_TRUNC); /* in case we close and reopen */
        this.writeSize = sendBufferSize - 70;

        when(mockDelegate.getBufferCacheSize()).thenReturn(16);
        when(mockDelegate.getNotifyBufferSize()).thenReturn(1024);

        // When
        int sendBufferSize = delegatingConfig.getSendBufferSize();
        int receiveBufferSize = delegatingConfig.getReceiveBufferSize();
        int maximumBufferSize = delegatingConfig.getMaximumBufferSize();

          object : DelegatingSocketFactory(getDefault()) {
            override fun configureSocket(socket: Socket): Socket {
              socket.receiveBufferSize = socketBufferSize
              socket.sendBufferSize = socketBufferSize
              return socket
            }
          },
        ).writeTimeout(Duration.ofMillis(500))
        .build()
    server.start()
    server.enqueue(