> > 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.
I don't see how it can avoid locking up. To allow the machine to
continue to run would be to risk dropping the write (where would it be
stored?), and this presumably breaks PCI semantics.
John
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