[Bug 73064] [i915] [Regression] Generalized slowness after upgrade to kernel 3.10

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73064

--- Comment #8 from Chris Wilson <chris at chris-wilson.co.uk> ---
Did you enable vtd or iommu? Does intel_iommu=off make any difference?

i.e. does this log anything?

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c
b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 998f9a0b322a..2adfef0fa6ac 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -1727,6 +1727,9 @@ static int i915_gmch_probe(struct drm_device *dev,
        dev_priv->gtt.do_idle_maps = needs_idle_maps(dev_priv->dev);
        dev_priv->gtt.base.clear_range = i915_ggtt_clear_range;

+       if (unlikely(dev_priv->gtt.do_idle_maps))
+               DRM_INFO("applying Ironlake quirks for intel_iommu\n");
+
        return 0;
 }

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