Re: [PATCH] Revert "drm/i915: Kill GTT mappings when moving from GTT domain"

[Chris Wilson <chris@chris-wilson.co.uk>]

On Wed, 15 Jun 2011 08:08:59 -0700, Eric Anholt <eric@anholt.net> wrote:
> On Wed, 15 Jun 2011 10:39:06 +0100, Chris Wilson <chris@chris-wilson.co.uk> wrote:
> > For the record, on my SugarBay, this patch on top of drm-intel-fixes and
> > mesa.git + your instruction streaming, regresses cairo-xlib 4.5s to 4.7s
> > (4%, with a claim of .1% stddev) and improves cairo-gl from 21.5s to 20.1s
> > (6.5%, with a claim of .5% stddev) for the firefox-talos-gfx. [This is a
> > system that can do under 2s for cairo-xlib using vmap and the perf
> > patches I posted before.]
> > -Chris
> 
> I was testing with semaphores enabled on the LLC series.  I'm curious
> how this revert could possibly regress cairo-xlib, though -- that seems
> very strange.

Moving back to LLC+semaphores (2.6.39-rc2+), firefox-talos-gfx:
xlib: 4.473
gl:  20.753

applying the patch:
xlib: 4.472
gl:  20.824

I'm just not reproducing the same issue you are seeing. Are you using a
standard distro Kconfig, or if not, can you send me yours?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre