Re: gettimeofday() resolution in Linux?

[Andi Kleen]

lsorense@xxxxxxxxxxxxxxxxxxx (Lennart Sorensen) writes:
>
> On many systems gettimeofday uses the TSC, but on many multicore systems
> the TSC on each core may be out of sync, in which case the cpu you are
> running on may give a different gettimeofday result than another cpu,
> which is probably a bad thing for some processes.

In this case Linux falls back to other timers which are slower and 
less accurate.

jiffies based gettimeofday is theoretically possible, but near
never used.

-Andi
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