• Ville Syrjälä's avatar
    drm/i915: Enable GTT caching on gen8 · 6d50b065
    Ville Syrjälä authored
    GTT caching was disabled by default on gen8 due to not working with
    big pages. Some information suggests that it got fixed, but still
    GTT caching has been left disabled by default. Or could be it just
    meant that the default was changed to off, and hence the problem
    got solved.
    
    Enable GTT caching in the hopes of some performance increase.
    Whether or not the big pages issue has been fixed is irrelevant
    at this stage since we don't use big pages.
    
    This gives me a 1-2% improvement in xonotic on my BSW. Haven't tried
    BDW, but supposedly it has larger TLBs so might not benefit as much.
    On HSW GTT caching is enabled by default.
    Signed-off-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
    Reviewed-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
    Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
    6d50b065
intel_pm.c 194 KB