Thanks a lot Eric, so you mean to use a chdev isnt a good idea! Why? Speed? I have read some books and has made a chdev to communicate with userspace, but now i dont know how fast this is. As mentioned i need throughput... :( Bye -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/