On Sun, 06 May 2012 23:51:26 -0700, Eric Anholt <[email protected]> wrote: > On Fri, 4 May 2012 18:58:59 -0700, Ben Widawsky <[email protected]> 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. > > My IVB system started with an SNBPCR value of 0x1b40. To test the effect of > this patch, I just smashed the value of the reg at runtime: > > Results: > x intel_reg_write 0x900c 0x001b40 > + intel_reg_write 0x900c 0x201b40 > > citybench: > +------------------------------------------------------------------------------+ > | xxx + > | > | x xxx + + + > | > | x xxx + +++ > | > | x xxx + + ++++ > | > | xx xxxx + + ++++ > | > |x xxx x xxxx + + ++++++ ++ > | > |xxxxx xxxxxxxx + + + + +*++++ ++ > | > |xxxxxxxxx xxxxxxxx x +++++ ++++ +*+++++++ > | > |xxxxxxxxx xxxxxxxxxx x ++++++++++ ++**+++++++ + + > | > |xxxxxxxxx xxxxxxxxxxxxxx *++++++++++++ ****+*++++++++ + ++++++ > +| > | |___________AM_________| |_________A_M_______| > | > +------------------------------------------------------------------------------+ > N Min Max Median Avg Stddev > x 118 335.779 387.456 354.306 352.63131 12.462796 > + 118 367.324 419.02 386.14 384.47139 10.970918 > Difference at 95.0% confidence > 31.8401 +/- 2.99585 > 9.02928% +/- 0.849569% > (Student's t, pooled s = 11.7406) > > openarena: > +------------------------------------------------------------------------------+ > | + ++ xx xx x x xx > | > | + + ++ + + xxxxxxx xxxxx > | > | +++ ++++++++++ ++++++ ++ + x xxxxxxxxxxxxxxx > xx| > |++ + ++++++++++++++++++++++++++++ + + + x x xxxxxxxxxxxxxxxxxx > xx| > | |_________A________| |_____A____| > | > +------------------------------------------------------------------------------+ > N Min Max Median Avg Stddev > x 65 273.5 292.2 284 283.73385 4.2561822 > + 65 234.8 263.2 249.9 249.6 6.9873323 > Difference at 95.0% confidence > -34.1338 +/- 1.989 > -12.0302% +/- 0.70101% > > nexuiz: > +------------------------------------------------------------------------------+ > | + > | > | x + + > | > | + x x xx *x+ +x > | > |+ + + x *x+x xxx + x++ + x+*xxxx+x***x+++*x**+x ++ > *+| > | |____|____________AAM____M_____|______| > | > +------------------------------------------------------------------------------+ > N Min Max Median Avg Stddev > x 33 74.314888 76.177197 75.424764 75.332161 0.48205891 > + 33 73.397254 76.219868 75.584749 75.363209 0.69408523 > > Using these 3 tests, this patch does not look like a win. Note that OA > is the most CPU-bound of these, while nexuiz is usually on the edge > between being CPU and GPU-bound, and citybench is definitely GPU > limited.
Re-testing, openarena (1024x768) currently is about a 2.5% +/- 0.5%
loss (lost the numbers). Also, new tropics numbers:
N Min Max Median Avg Stddev
x 70 21.9718 22.2166 22.1556 22.154501 0.029139432
+ 69 22.7246 22.9308 22.8914 22.888735 0.027248939
Difference at 95.0% confidence
0.734233 +/- 0.00938209
3.31415% +/- 0.0423485%
(Student's t, pooled s = 0.0282169)
That swings things in favor of the patch for me.
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