• Chris Wilson's avatar
    uxa: Default to using TILING_X for pixmaps. · 2eec53d0
    Chris Wilson authored
    On memory constrained hardware, tiling is vital for good performance as
    it minimizes cache misses.  The downside is that for older hardware
    (which often suffers from the lack of bandwidth) requires the use of
    fences for many operations, which are in short supply and so may cause
    shorter batchbuffers. However our batch buffers are typically short and
    so this is unlikely to be a concern and not affect the performance wins.
    
    A quick bit of testing suggests the effect is inconclusive on
    firefox/i945:
                      linear            tiled
      xcb             205.470           206.219
      xcb-render-0.0  404.704           388.413
      xlib            166.410           170.805
    
    A secondary effect of the patch is to workaround a G31 specific hang
    when attempting to use linear 2048x2048 surfaces. Bonus!
    
    Fixes:
      Bug 25375 - Performance issue using texture from pixmap (tfp) glx extension on 945
      http://bugs.freedesktop.org/show_bug.cgi?id=25375
    
      Bug 27100 - GPU Hung copying a 2048x1152 pixmap
      http://bugs.freedesktop.org/show_bug.cgi?id=27100Signed-off-by: Chris Wilson's avatarChris Wilson <chris@chris-wilson.co.uk>
    Tested-by: default avatarJohn <jvinla@gmail.com>
    2eec53d0
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