[Bug 111090] 3% perf drop in GfxBench Manhattan 3.0, 3.1 and CarChase test-cases

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111090

--- Comment #15 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to Eero Tamminen from comment #14)
> Between following drm-tip kernel commits:
> 8bb86058e9 at 2019-08-09 15:06:19: 2019y-08m-09d-15h-05m-28s UTC integration
> manifest
> cfacb6e14c at 2019-08-10 14:01:32: 2019y-08m-10d-14h-00m-41s UTC integration
> manifest
> 
> There were following perf changes on SKL GT2 & KBL GT3e:
> * SynMark VSTangent improved by 10%
> * GLB 2.7 Egypt improved by 1-2%
> * GLB 2.7 T-Rex improved by < 1%
> * SynMark ZBuffer decreased by 5% KBL GT3e and 3% on SKL GT2 (*)

Principal change there:
      drm/i915/gtt: enable GTT cache by default
      drm/i915/gtt: disable 2M pages for pre-gen11

Other noteworthy (but unlikely to impact):
      dma-buf: make dma_fence structure a bit smaller v2
      dma-buf: add reservation_object_fences helper
      drm/i915: use new reservation_object_fences helper
      dma-buf: further relax reservation_object_add_shared_fence

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