I have no idea.
On Wed, Jul 07, 1999 at 03:54:03PM +0200, Sven Heursch wrote:
> Victor Yodaiken wrote:
>
> > Docs are going to be written soon, I swear.
> > The idea is simple. If you set a timer to interrupt every 1000 time
> > units then if you have a single task with period 1000 things work out great.
> > If you add a task with period 500, then you can simply get the clock to
> > interrupt every 500 ticks.
> > Now add a task with period 1291. One option is to make the clock
> > interrupt very 200 ticks and then sit on the timer 91 ticks until
> > it's time to run the third task. But if you add a task with period 558
> > even this solution is not good. So, RTL has a "oneshot" option, where
> > the timer period is dynamically reset by the schduler ever interrupt.
> > For example, we set the clock to interupt after 558 ticks.
> > reset it to interrupt after another 442 ticks to get to 1000
> > reset it to interrupt after another 291 ticks
> > the disadvantage of one-shot on uniprocessor x86 machines is that
> > reprogramming the clock takes 10 microseconds or so. If you can use
> > the periodic mode, it's more efficient in reprogramming time. but
> > if your schedule does not fit a good period, then oneshot is
> > much better.
> >
> > In situations where we can use on board timers, e.g. the APIC timer, the
> > oneshot reprogram is fast enough to make it a better tradeoff.
> >
>
> Hi there,
>
> isn't this oneshot technic used in the KURT UTIME Patch, too?
>
> Greeting
> S.Heursch
>
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--
Victor Yodaiken
Socorro New Mexico
USA.
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