Testing msr.c:

# dmesg (edited)
Copyright (c) 1992-2002 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
	The Regents of the University of California. All rights reserved.
FreeBSD 4.6-RELEASE #4: Thu May 15 08:30:14 PDT 2003
    root@homebrew.cs.pdx.edu:/usr/src/sys/compile/HOMEBREW
Timecounter "i8254"  frequency 1193182 Hz
CPU: Pentium III/Pentium III Xeon/Celeron (666.70-MHz 686-class CPU)

bash-2.05a# ./msr
sleep[0]: 672621875
sleep[1]: 673144825
sleep[2]: 673319878
sleep[3]: 673306575
sleep[4]: 673325613
sleep[5]: 673334266
sleep[6]: 673303318
sleep[7]: 673329024
sleep[8]: 673306944
sleep[9]: 673335723
getpid: 10129
usleep 1 sec: 673244062
usleep 1 usec: 13277606
function call: 137
hello world
printf: 31798
fork: printf: 193827