How to improve my dirver's performance

I have writen a driver as this :

1)a kernel thread receive data sent by other computer via tcp/ip, and put them into a queue;
2)another kernel thread get the data from the queue ,and write it to a disk .In this step,i implement by the follow code:

	......
	    generic_make_request(WRITE,bh);//the buffer head is alloced by
kmalloc by myself
            run_task_queue(&tq_disk);

......

My problem :
In this way ,the disk's performance is bad. How can i do to improve the disk's performance ? Please give me a hand.