On Wed, Jul 07, 1999 at 04:16:44PM +0000, Paolo Mantegazza wrote:
> Victor Yodaiken wrote:
>
> > the disadvantage of one-shot on uniprocessor x86 machines is that
> > reprogramming the clock takes 10 microseconds or so.
>
> That is not true, provided you do not want to use 486s, but is due to
> the type of implementation of the concept adopted in RTL. In fact I can
> prove that with a different implementation, e.g our older variant for
> RTL based on 2.0.xx and RTAI for 2.2.xx, it can go down to 2-3 us on ony
> PENTIUM and compatible. In that case you can use the CPU clock and have
> just to do two "outb-s" to reprogram the 8254 timer chip counter for the
You can prove whatever you want, but I have timed a single outb to the isa
interface at 12microseconds on a PII LX chipset.
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