On Tue, Nov 21, 2000 at 09:01:37AM -0700, John Regehr wrote:
> > > common case by eliminating a PCI read). A write to a full FIFO will
> > > stall the PCI bus (and the rest of the machine) - this condition can
> > > last for many milliseconds.
> >
> > Many milliseconds?
> > Do you have an example hardware to test?
>
> You can see how it would take many milliseconds by looking at the amount
> of data that must be moved. For example, when dragging an 800x600x32
> window, every blit has to move 1.8MB. When I tested this a few years
> ago (with early AGP video hardware) this sort of thing could take
> 25-30ms.
The question is whether a modern PCI bus will lock for the entire transaction.
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Victor Yodaiken
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