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Thread: DMA-BUF Cross-Device Synchronization Still Baking

  1. #1
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    Default DMA-BUF Cross-Device Synchronization Still Baking

    Phoronix: DMA-BUF Cross-Device Synchronization Still Baking

    One of the features that multi-GPU (Optimus/PRIME) owners and other DMA_BUF-using Linux users have been waiting on is cross-device synchronization support. Patches are still flowing for this missing feature and with some luck maybe we will finally see it ready for the Linux 3.15 kernel...

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

  2. #2
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    I can't wait for this to be implemented. I am sick of tearing with DRI_PRIME.

  3. #3
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    Quote Originally Posted by sarmad View Post
    I can't wait for this to be implemented. I am sick of tearing with DRI_PRIME.
    Even if the support is merged (and the patches on the mailing list lack yet the patches to implement it for the intel, radeon and nouveau drivers),
    there will still be glitches with X DRI2, because when DRI_PRIME is set, it disables vsync.

  4. #4
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    Quote Originally Posted by mannerov View Post
    Even if the support is merged (and the patches on the mailing list lack yet the patches to implement it for the intel, radeon and nouveau drivers),
    there will still be glitches with X DRI2, because when DRI_PRIME is set, it disables vsync.
    I wanted to say tearings, not glitches (with the patches, there shouldn't be any glitches)

  5. #5
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    Quote Originally Posted by mannerov View Post
    Even if the support is merged (and the patches on the mailing list lack yet the patches to implement it for the intel, radeon and nouveau drivers),
    there will still be glitches with X DRI2, because when DRI_PRIME is set, it disables vsync.
    That sucks. Oh well, I guess we'll have to wait for Wayland. Hopefully Wayland will be tear free wether with PRIME or not.

  6. #6
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    Quote Originally Posted by sarmad View Post
    That sucks. Oh well, I guess we'll have to wait for Wayland. Hopefully Wayland will be tear free wether with PRIME or not.
    He said X DRI2 had tearing. DRI3 -might- not. I can't get a solid yes or no from googling.

  7. #7
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    Quote Originally Posted by Ericg View Post
    He said X DRI2 had tearing. DRI3 -might- not. I can't get a solid yes or no from googling.
    Depends how DRI_PRIME is implemented for DRI3.
    For the moment it hasn't been implemented.

    But now I think of it, the patches might get rid of tearings with DRI2 with an X compositor doing full screen refreshes synced with vsync.

  8. #8
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    Quote Originally Posted by mannerov View Post
    I wanted to say tearings, not glitches (with the patches, there shouldn't be any glitches)
    What's the difference?

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