Messages in this thread | | | Date | Wed, 10 Apr 2002 18:12:43 +0200 (MEST) | From | Geert Uytterhoeven <> | Subject | RE: Using video memory as system memory |
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On Wed, 10 Apr 2002, Byron Stanoszek wrote: > On Wed, 10 Apr 2002, Holzrichter, Bruce wrote: > > That is a neat idea, though. The PCI/AGP bus may be a limiting factor for > > this as well, correct? As far as speed, I believe most video cards have > > fast memory, vram, or sram, but it's only useful transferring between the > > Video GPU, and Video cards memory, as the bus to the video card is the > > bottleneck. > > Yeah. In fact in some responses the 'slow speed' consideration was so much that > they all say I'd be better off writing a block driver and making use of the > memory more as a swap device rather than as system RAM. > > Has anyone out there done this yet? I figure I'd ask before reinventing > anything.. :)
drivers/block/z2ram.c does this for RAM in the Amiga Zorro II space.
(Why? Because you cannot use Zorro II RAM as system RAM on machines equipped with a Zorro III bus because on those machines Zorro II RAM doesn't support read-modify-write cycles.)
Gr{oetje,eeting}s,
Geert
-- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
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