[Intel-gfx] [PATCH] drm/i915: set IDICOS to medium uncore resources

[Chris Wilson]

On Mon, 18 Jun 2012 10:35:54 +0200, Daniel Vetter <daniel at ffwll.ch> wrote:
> On Fri, May 04, 2012 at 06:58:59PM -0700, Ben Widawsky wrote:
> > I'm seeing about a 5% FPS improvement across various benchmarks on my
> > IVB i3. Rumor has it that the higher end parts show even more benefit.
> > 
> > This derives from a patch originally given to me by Bernard. The docs
> > are  confusing about the definition names (ie. medium really seems like
> > max), but it would seem it gives more cache to the GT at the expense of
> > uncore. This configuration makes the split most in favor of the GT. I've
> > not tried the other IDICOS values.
> > 
> > Cc: "Kilarski, Bernard R" <bernard.r.kilarski at intel.com>
> > Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
> Queued for -next, with Eric's ack added. Although I've had fix the patch,
> it didn't compile :(

So this introduces a 10% (205 to 185 fps on an i7-3720qm @10x7) performance
regression on good old CPU bound padman, but one large win with alpha
compositing the same texture over and over again (fishtank 7.8s to 6.8s).

Oh well, there's plenty of overhead in mesa to recover -- reading the
profiles it is rate limited by the cpu overhead in i965_dri.so.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre