[Intel-gfx] [PATCH] drm/i915: Enable the HiZ RAW Stall Optimization on Gen8.

2015-01-11 Thread Kenneth Graunke
This is an important optimization for avoiding read-after-write (RAW) stalls in the HiZ buffer. Certain workloads would run very slowly with HiZ enabled, but run much faster with the "hiz=false" driconf option. With this patch, they run at full speed even with HiZ. Improves performance in OglVSIn

Re: [Intel-gfx] [PATCH] drm/i915: Enable the HiZ RAW Stall Optimization on Gen8.

2015-01-12 Thread Ville Syrjälä
On Sat, Jan 10, 2015 at 06:44:49PM -0800, Kenneth Graunke wrote: > This is an important optimization for avoiding read-after-write (RAW) > stalls in the HiZ buffer. Certain workloads would run very slowly with > HiZ enabled, but run much faster with the "hiz=false" driconf option. > With this patc

Re: [Intel-gfx] [PATCH] drm/i915: Enable the HiZ RAW Stall Optimization on Gen8.

2015-01-12 Thread Kenneth Graunke
On Monday, January 12, 2015 02:32:20 PM Ville Syrjälä wrote: > On Sat, Jan 10, 2015 at 06:44:49PM -0800, Kenneth Graunke wrote: > > This is an important optimization for avoiding read-after-write (RAW) > > stalls in the HiZ buffer. Certain workloads would run very slowly with > > HiZ enabled, but