hi I have these server nodes, doing video streaming. and running a server benchmark with 20 concurrent client connections. hardware is 4 IDE drives. kernel is 2.4.20-pre10 + ext3 O_DIRECT support. filesystem is ext3. The only system call that seems to eat any system time of importance is 'cdrom_sysctl_register' problem is: there is no cdrom on the system! attached is the .config and these three readprofile output files (pro[123]). see time to see the interval they have been created in bash-2.05# ls -l pro[1-3] -rw-r--r-- 1 root root 13965 Jan 29 00:05 pro1 -rw-r--r-- 1 root root 14193 Jan 29 00:06 pro2 -rw-r--r-- 1 root root 15162 Jan 29 00:09 pro3 roy -- Roy Sigurd Karlsbakk, Datavaktmester ProntoTV AS - http://www.pronto.tv/ Tel: +47 9801 3356 Computers are like air conditioners. They stop working when you open Windows.