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  • #31
    Or if the card has something way overkill, like anything above 512mb, why would it be a bad idea to use it for swap?

    (ref overkill for my uses, my display is 1600x900)

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    • #32
      Reading from vram with the CPU is REALLY slow.

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      • #33
        Also, you can never have enough vram. LOTS of pixamps get stored in vram (especially when running a compositor), so you are probably using more than you think.

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        • #34
          I wouldn't want to swap to VRAM on a card I was also using for graphics - in addition to the issues related to sharing VRAM you would also be sharing BAR address space, which might be an even bigger problem.

          I guess swapping to an unused graphics card would still be OK but not sure whether the driver would set things up properly if there was no display attached.

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          • #35
            It works!! I tested it on F14 alpha and it works great.

            dmesg confirms the full memory usage:

            radeon 0000:01:00.0: VRAM: 512M 0x00000000 - 0x1FFFFFFF (512M used)
            [drm] Detected VRAM RAM=512M, BAR=256M
            [drm] radeon: 512M of VRAM memory ready
            [drm] vram apper at 0xD0000000

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            • #36
              Originally posted by kadambi View Post
              It works!! I tested it on F14 alpha and it works great.
              Nice to see that after 2 years your problem is solved So, this has been a problem ever since Fedora 10 up to now?

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              • #37
                Originally posted by agd5f View Post
                Reading from vram with the CPU is REALLY slow.
                Slower than reading from hard disk?

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                • #38
                  Originally posted by devius View Post
                  Nice to see that after 2 years your problem is solved So, this has been a problem ever since Fedora 10 up to now?
                  Well, this was a new feature essentially. Without KMS and memory manager, you can't address beyond PCI BAR address (256MB). With memory manager now in place, it works fine.

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                  • #39
                    Originally posted by nanonyme View Post
                    Slower than reading from hard disk?
                    Maybe on AGP.

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