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Radeon KMS Gets Faster X-Video Support

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  • phoronix
    started a topic Radeon KMS Gets Faster X-Video Support

    Radeon KMS Gets Faster X-Video Support

    Phoronix: Radeon KMS Gets Faster X-Video Support

    If using the latest ATI open-source driver Git code for kernel mode-setting, there may be slightly better X-Video support without any visual slowdowns/problems. Pauli Nieminen has changed around the code so that a video buffer is allocated in the GTT (Graphics Translation Table) to provide faster memory operations that haven't been accelerated by KMS. The patch that provides the performance boost to X-Video under ATI kernel mode-setting can be found on the xorg-driver-ati mailing list and has since been committed...

    http://www.phoronix.com/vr.php?view=Nzk4NA

  • smitty3268
    replied
    The patch says the reason it is needed is because uploading the screen into video memory isn't accelerated yet. It sounds like there's a lot of stuff that still needs to be done before KMS can be considered "done".

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  • RealNC
    replied
    The point was not to make Xv be faster with KMS than UMS, but to rather improve the current KMS situation. UMS is still the only practical choice right now.

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  • Melcar
    replied
    Performance seems to be much worse with r7xx class hardware:

    http://global.phoronix-test-suite.co...30-17424-20469

    The movie playback tests aren't running on my setup for some reason, so I can't compare if Xv playback is any different between KMS and UMS; but I somehow doubt that it's any different though, at least not in a noticeable way.

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  • RealNC
    replied
    This thread is titled "Radeon KMS Gets Faster X-Video Support" so it is assumed that we are talking about the radeon driver in the first place.

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  • brent
    replied
    Originally posted by RealNC View Post
    Oh yes, it does.
    No. The radeon developers chose to only support it with KMS, though. In general, KMS is not a requirement to make DRI2 work.

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  • RealNC
    replied
    Originally posted by brent View Post
    DRI2 doesn't need KMS.
    Oh yes, it does.

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  • mattst88
    replied
    Originally posted by brent View Post
    DRI2 doesn't need KMS.
    Maybe not explicitly, but KMS is required for DRI2 on Radeons.

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  • Melcar
    replied
    I though it did. How do you get DRI2 without KMS then? Anyway, another reason to use KMS is that without it you loose like 90% of your advanced OpenGL functionality in the drivers; not bad if you don't use the drivers for 3D stuff though.

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  • brent
    replied
    DRI2 doesn't need KMS.

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