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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [i915] [Regression] Generalized slowness after upgrade to kernel 3.10"
href="https://bugs.freedesktop.org/show_bug.cgi?id=73064#c8">Comment # 8</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [i915] [Regression] Generalized slowness after upgrade to kernel 3.10"
href="https://bugs.freedesktop.org/show_bug.cgi?id=73064">bug 73064</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>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;
}</pre>
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