[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 #9 from Jonathan Protzenko <jonathan.protzenko+fdo at gmail.com> ---
Hi, and first of all thanks for the quick feedback and help :-).

(In reply to comment #8)
> Did you enable vtd or iommu?
I, unfortunately, have no idea what this even means. I'm just following
Debian's default setup. If you can tell me how to determine this, I'd be happy
to provide you with the information.
> Does intel_iommu=off make any difference?
Yes, booting with 3.11 and intel_iommu=off _does_ fix the problem. Fantastic!
> 
> 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;
>  }
Booting 3.11 with intel_iommu=off, I do not see the message above in the output
of dmesg.

Let me know if I can help you further!

Cheers and a happy new year,

~ jonathan

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20131230/d0f4713a/attachment.html>