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Thread: GLAMOR'ized Radeon Driver Shows Hope Over EXA

  1. #1
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    Default GLAMOR'ized Radeon Driver Shows Hope Over EXA

    Phoronix: GLAMOR'ized Radeon Driver Shows Hope Over EXA

    While Intel has their highly-tuned "SNA" acceleration architecture for delivering maximum 2D performance, it turns out the OpenGL-based GLAMOR acceleration architecture for the open-source Radeon driver may be better than the xf86-video-ati driver's own EXA implementation...

    http://www.phoronix.com/vr.php?view=MTQ3NTY

  2. #2
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    To quote
    "SNA is the very large and highly-tuned 2D code-path..."

    I hope for the people using an intel chip it is not as large and complex and therefore vulnerable and messy in the end like intel's UEFI reference implementation.

  3. #3
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    Interestingly, while GLAMOR was 2.0x slower than SNA, the fglrx driver and its 2D Cairo performance was 9.0x slower.
    I have got similar results with my old Intel GMA X4500 outperforming in 2D fglrx on Alienware Radeon HD 7970M

    http://openbenchmarking.org/result/1...MAKS-LENOVOC34

    Cairo Performance Demo

  4. #4

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    I use glamor on a A8-5500 (ARUBA), which uses the r600 driver (Debian Testing 64-bit, Xfce 4.10, no compositing, mesa, glamor, xf86-ati, kernel from git). I am kinda stuck with it because appears to be more stable than EXA which seems to cause freezes.
    And it doesnt feel any faster than EXA, also it has some visual issues (certain notification area icons are fully transparent). Activating the built in xfce software compositing makes most of them appear (except the alltray'ed ones), but then the interface feels a bit more sluggish and there is a cloned tile of the first workspace's maximized window (i keep the browser there) upper left corner that is present in all workspaces (it appears if a new icon registers in the tray).
    Libreoffice's menus have their text color set to white (instead of black) and highlight background to grey (instead of blue) so the hovered text is almost invisible.
    On the bright side, the CPU usage overall for dragging or drawing (mostly web pages) operations etc seems to have gone down so it might be an advantage for mobile users.

  5. #5

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    There are some glamor speedups and fixes in the queue, see http://lists.freedesktop.org/archive...ober/date.html

  6. #6

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    Quote Originally Posted by oibaf View Post
    There are some glamor speedups and fixes in the queue, see http://lists.freedesktop.org/archive...ober/date.html
    Looks good. When will be merged into master?

  7. #7
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    The baseline I have chosen here is the performance of the Intel DDX using SNA but with acceleration disabled that is it is completely rendering using the i5-2500 CPU.
    It was found that the default EXA acceleration method for 2D in the Radeon driver was 2.9x slower than Intel SNA on Sandy Bridge while the GLAMOR option was only 2.0x slower.
    Intel SNA isn't really compared.

  8. #8
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    glamor slow down 3d performance on my 6770, openarena, lightsmark -10\15% againts exa

  9. #9
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    Faster!? Maybe with gnome, with KDE is simply unusable: https://bugs.freedesktop.org/show_bug.cgi?id=69341
    At least it isn't glamor's fault because on Intel HD 4000 I haven't this issue.

  10. #10
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    It doesn't matter how much faster it is as long as it tears. Also quite sad it's that buggy.

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