[Bug 111731] [SKL GT4e] large perf drop (up to 27%) in most 3D benchmarks

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111731

--- Comment #1 from Chris Wilson <chris at chris-wilson.co.uk> ---
drm/i915: Make i915_vma.flags atomic_t for mutex reduction
drm/i915: Make shrink/unshrink be atomic

are meh.

drm/i915: Whitelist COMMON_SLICE_CHICKEN2

is a possiblity, but my money is on

drm/i915: Force compilation with intel-iommu for CI validation

A run with intel_iommu=off should test that theory, or intel_iommu=igfx_off and
reverting HAX iommu/intel: Ignore igfx_off

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