Hello : I have received answers to my question RE : rtl task brings the host down. Victor Yodaiken asked me what is the value of SPEED in the code if ( pthread_make_periodic_np( mem_tasks[1], gethrtime(), SPEED*300000000 ) printk ("\n MEM Thread 2 is periodic now\n"); The value of SPEED is 3000. What is the maximum period that can be assigned to a rt periodic task ? It could be why I am having a problem -- the period is too large. Sincerely, Olga -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/