On Fri, Dec 5, 2008 at 10:27 AM, Russ Cox <[EMAIL PROTECTED]> wrote: >> i don't think this is the case. if you recall from the original >> post, i have used the pat registers to set up memory types on >> a pcie card and i do see dramatic speedups for drawing to >> the screen. however, reading from the screen is just as slow >> as before. > > I think the problem of
I think the problem is that when video card manufacturers optimize read bandwidth, they are working on the read bw of the video card's RPC-like interface, not the read bw from the video memory. To a first approximation, no one reads directly from video memory. Russ
