Hi all, Can someone suggest a reliable way of calculating the amount of time spent inside an ISR? one way i figured was to store the jiffies value on entering and exiting the ISR and subtract these to get the time spent inside a drivers ISR. TIA, -mandeep -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/