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David Airlie Announces "Reverse Optimus" Multi-GPU

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  • David Airlie Announces "Reverse Optimus" Multi-GPU

    Phoronix: David Airlie Announces "Reverse Optimus" Multi-GPU

    David Airlie has announced work on "Reverse Optimus", which is a new approach he's taking for poking laptops with multiple GPUs, namely the NVIDIA Optimus laptops with a discrete NVIDIA GPU and integrated Intel graphics...

    http://www.phoronix.com/vr.php?view=MTI2ODc

  • #2
    This isn't even remotely funny anymore... . Once I heard the first messages of two videocards in a laptop, I thought it was an april's fools joke. Turned out to be bitter truth.

    Are there any dual video card laptop configuration that work without a hitch? I don't mind if it takes up an effort to setup up though...

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    • #3
      Originally posted by Rexilion View Post
      This isn't even remotely funny anymore... . Once I heard the first messages of two videocards in a laptop, I thought it was an april's fools joke. Turned out to be bitter truth.
      There are even laptops that run Crossfire/SLi setups as well.

      Comment


      • #4
        Originally posted by Rexilion View Post
        This isn't even remotely funny anymore... . Once I heard the first messages of two videocards in a laptop, I thought it was an april's fools joke. Turned out to be bitter truth.
        Why? It makes perfectly sense for an IGP + dedicated GPU combination.

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        • #5
          "Reverse optimus"? So it's "sumitpo"? Or, since anagrams are popular nowadays, how about "imp to us" or "imps out"!

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          • #6
            Originally posted by GreatEmerald View Post
            "Reverse optimus"? So it's "sumitpo"? Or, since anagrams are popular nowadays, how about "imp to us" or "imps out"!
            Or "positum". It's latin. But what does it exactly mean?

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            • #7
              Originally posted by Rexilion View Post
              This isn't even remotely funny anymore... . Once I heard the first messages of two videocards in a laptop, I thought it was an april's fools joke. Turned out to be bitter truth.

              Are there any dual video card laptop configuration that work without a hitch? I don't mind if it takes up an effort to setup up though...
              Afaik optimus with bumblebee works faily smooth. Just set an env and run your application on the dedicated gpu.

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              • #8
                Originally posted by entropy View Post
                Why? It makes perfectly sense for an IGP + dedicated GPU combination.
                Only if the big GPU can't go low enough in idle/2d modes. This is constantly improving, so in a generation or two only the most high-end mobile GPUs should require an integrated one too to keep power in check.

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                • #9
                  Originally posted by entropy View Post
                  Why? It makes perfectly sense for an IGP + dedicated GPU combination.
                  Erm, not in my world. I agree with what curaga is mentioning: it's a scaling issue.

                  But that is outright insane. 10 years ago, laptops carried 1 card. Right now, it's 2. In 10 years time, it will be 1 card again.

                  Huh?

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                  • #10
                    Originally posted by curaga View Post
                    Only if the big GPU can't go low enough in idle/2d modes. This is constantly improving, so in a generation or two only the most high-end mobile GPUs should require an integrated one too to keep power in check.
                    I couldn't find any recent numbers. It would be really interesting to see a comparison of the
                    power consumption of typical mobile IGPs and dedicated mobile GPUs running in 2d mode.
                    Even more interesting is the trend over the last say five years (for low- to high-end components).

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                    • #11
                      Originally posted by curaga View Post
                      Only if the big GPU can't go low enough in idle/2d modes. This is constantly improving, so in a generation or two only the most high-end mobile GPUs should require an integrated one too to keep power in check.
                      Except that all the CPUs just have GPUs built in anyway, and they're almost guaranteed to be more power efficient than keeping an entire second board powered, even in very low idle states, due to having integrated power regulation circuitry and not needing to keep an interconnect/bus powered.

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                      • #12
                        I think Primus has a much better approach - it doesn't use VirtualGL and does only one copy. And its fast and not so power hungry as only GLX gets handled.

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                        • #13
                          Originally posted by elanthis View Post
                          Except that all the CPUs just have GPUs built in anyway, and they're almost guaranteed to be more power efficient than keeping an entire second board powered, even in very low idle states, due to having integrated power regulation circuitry and not needing to keep an interconnect/bus powered.
                          Yes, that doesn't conflict with it in any way. By then the "big gpu" will just be integrated into the cpu.

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                          • #14
                            Originally posted by Rexilion View Post
                            Are there any dual video card laptop configuration that work without a hitch? I don't mind if it takes up an effort to setup up though...
                            Yes. Any that allow you to "switch off" the discrete chip entirely. They work perfectly.

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