On Fri, Nov 03, 2000 at 07:21:21PM +0100, Poul-Henning Kamp wrote:
> The long answer is: FreeBSD can deliver time with a resolution of
> 1/2^32 nanosecond = 232.8E-21 seconds. The actual resolution is
> much worse, because the hardware usually doesn't provide any better
> than about a nanosecond at best these days. On certain hardware
> only about a microsecond of actual resolution is available.
Why could't gettimeofday be tuned to provide nanosecond resolution
in reality, with the assistance of the TSC register ? I understand
this does not work on a 486, but that's not the platform people
ask for such a resolution. With every celeron today exceeding 300
MHz, 3 nanoseconds is a reality. Of course, there will be syscall
overhead, understood.
Joerg
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