On Fri, Jun 23, 2000 at 03:39:39PM -0500, Richard Bonomo wrote:
> > This is about what my parport webcam driver does, see cpia_pp.c in the
> > 2.2.16 kernel. However my LARGE (about 300K IIRC) might not be as LARGE
> > as yours. ;)
> Is that available at Redhat.com or linux.org?
> (Is it possible to get just the webcam driver?)
> Do you think that DMA offers a speed advantage over interrupt-driven
> programmed i/o, given the additional overhead?
It will definitly make the cpu way happier. CPU-utilization dropped
from about 60% to less than 10% on a 350MHz PIII in my case during full
times of thruput. But as long as you have cycles to burn it might not
bring you any improved thruput. Though I used a sort of polling PIO but
no busy waiting. According to my tests the polling was not the cause
for the CPU-usage.
-- Even the thought that a ship was waiting to take him back to Earth did not wipe out the sense of loss he felt at that moment. ------------------------------- Email: Peter_Pregler@email.com
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