[PATCH 0/1] [Jaunty] LP#314928 -- AGP aperture MTRR for Intel i915 family

[Tim Gardner]

Andy Whitcroft wrote:
> We have been seeing a number of bugs relating to Intel graphics
> performance.  Rather than being one single bug this seems to be a slew
> of little problems each chipping away at the overall speed.  One such
> problem is the MTRR marking the AGP aperture as write-combining is missing.
> Particularly when tiling is enabled, this has a significant performance
> impact.  Noticible visually in combiz effects, and even causing tearing on
> video playback for some users.
> 
> Fixes things up for me, and reported to fix testers on the bug.
> 
> Proposing for SRU to Jaunty.
> 
> -apw
> 
> Eric Anholt (1):
>   UBUNTU: SAUCE: drm/i915: Set up an MTRR covering the GTT at driver
>     load.
> 
>  drivers/gpu/drm/i915/i915_dma.c |   24 ++++++++++++++++++++++++
>  drivers/gpu/drm/i915/i915_drv.h |    1 +
>  drivers/gpu/drm/i915/i915_gem.c |    6 ------
>  3 files changed, 25 insertions(+), 6 deletions(-)
> 
> 

ACK - test results look good.

-- 
Tim Gardner tim.gardner at canonical.com