On Mon, 19 Jul 1999, Jason wrote:
> Before you go any further worrying about this "just in case", there is
> nothing for you to worry about. Part of what the MTRR "stuff" does is it
> stops the L2 cache from cacheing that range of memory. This is typicaly used
> for video cards, as you have been told, because well, you really never read
> back from the video card's memory frame buffer, and if you did, for some
> strange reason, it would only result in a cache miss and would then have to
> be fetched from main memory. Since your L2 cache isn't wasting space on this
> area of memory, it can cache something more usefull, and thus give you a
> speed *increase*.
>
I wrote the K6-2 MTRR support, but I really don't know how to use it.
You see, my X server reports:
(--) SVGA: PCI: NVidia Riva TNT rev 4, Memory @ 0xef000000, 0xcc000000
But which do I make uncacheable?
>
> Thus, MTRR is GOOD.
>
> - Jason
>
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