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by
Kenjiro Cho
#07 11/28/2002
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alternative clocks
Pentium TSC (Time Stamp Counter)
high-resolution
a 64bit counter driven by CPU clock
1nsec resolution for 1GHz CPU
light-weight
one instruction to read counter value
even in user space
drawbacks
frequency varies
power management changes CPU clock
external clock source
GPS, shortwave radio, CDMA
serial interface overhead