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

[Eric Anholt]

Chris Wilson <chris at chris-wilson.co.uk> writes:

> 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.

Yeah, the plan for CPU overhead is threading the dispatch -- it's what every
other driver does.
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