Poul-Henning Kamp wrote:
>
> But the two *really* interesting things about the FreeBSD code is:
>
> You can change your timecounter on the fly. This allows
> the machine to boot using maybe the TSC, then load the
> bitcode on the xrpu board, initialize the hardware on the
> xrpu and start to use that as the timecounter.
>
> If the hardware can be read atomically, no interrupt
> locking is used. This means on a multi-CPU system you
> will not have block interrupts to figure out what time
> it is, in fact all CPUs can find out what time it is
> *at the same time*, without interferring with each other.
>
> I belive those two features are unique to FreeBSD at this time.
We need to write benchmarks that place heavy emphasis on these features,
then. :-)
--
Daniel C. Sobral (8-DCS)
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