hi, i'm using instruction asm("cpuid") rdtscl(ini1) ;;; mycode ;;; asm("cpuid") rdtscl(ini2) its showing results which on 1.1 ghZ nearly calculates to 2millisecond the code is basically interrupt handler which does just 1 printk statement, ofcourse for just 1 printk statement it does not takes 2 ms in p4 1.1 ghz machine, or am i wrong in measuring in above code thanks in advance Prasanna __________________________________ Do you Yahoo!? Yahoo! Photos: High-quality 4x6 digital prints for 25¢ http://photos.yahoo.com/ph/print_splash -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/