On Mon, Jan 5, 2009 at 3:55 PM, Tomasz Chmielewski <[email protected]> wrote: > I have a Radeon 9200 PCI video card. > > I noticed only 64 MB out of 128 MB of video RAM memory is used: > > (II) RADEON(0): Generation 2 PCI interface, using max accessible memory > (II) RADEON(0): Detected total video RAM=131072K, accessible=65536K (PCI > BAR=65536K) > (--) RADEON(0): Mapped VideoRAM: 65536 kByte (64 bit DDR SDRAM) > > Why is it so? >
The PCI BAR size is only 64 MB so that's the most we can access. The GPU can access the rest; it's just the CPU that's limited to 64 MB. Unfortunately, we need proper memory management to handle the non-CPU addressable vram for things like software access. Work has begun on adding proper memory management to the drm, so it will be supported eventually. > > The system has also AGP card with 256 MB memory, and full 256 MB is used > there. On that card the PCI BAR is 256 MB so the CPU can access the full amount of vram. Alex _______________________________________________ xorg mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/xorg
