On Tue, 23 Sep 2003, Nathan Hand wrote:
> On Tue, 2003-09-23 at 05:58, Mark Vojkovich wrote:
> > Can we export to the drivers some function that yields the CPU?
> > Currently alot of drivers burn the CPU waiting for fifos, etc...
> > usleep(0) is not good for this because it's jiffy based and usually
> > never returns in less than 10 msec which has the effect of making
> > interactivity worse instead of better. I'm not sure which platforms
> > don't export sched_yield() and which will need alternative
> > implementations.
>
> FIFO busy loops are very quick. You'll harm overall graphic performance
> by yielding.
Your experience is out of date. If I've just filled a Megabyte
DMA fifo and I'm waiting to cram another Megabyte into it, how
quick is my FIFO busy loop then? I've had great success with
sched_yield().
Mark.
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