<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <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#c9">Comment # 9</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 <a class="email" href="mailto:jonathan.protzenko+fdo@gmail.com" title="Jonathan Protzenko <jonathan.protzenko+fdo@gmail.com>"> Jonathan Protzenko</a> <pre>Hi, and first of all thanks for the quick feedback and help :-). (In reply to <a href="show_bug.cgi?id=73064#c8">comment #8</a>) > 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</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>