I used this script to run buildworld 31 times with each kernel configuration. I threw away the first data point from each case. The "base" case is the given Subversion revision. The "1ppq" case adds this patch. Get the raw data here.
CPU: Intel(R) Xeon(R) CPU E5-2420 0 @ 1.90GHz (1900.04-MHz K8-class CPU) FreeBSD/SMP: 1 package(s) x 6 core(s) x 2 hardware threads head r315335 make -j8 buildworld
x base_j8_c12
+ 1ppq_j8_c12
+--------------------------------------------------------------------------+
| + |
| + |
| + + |
| + ++ x x |
| + ++ x x |
| ++++++ + x x xx x x |
|++ + + ++*++++* x*x x xxx x x xxxxxxxx x|
| |______A_M_____| |______________A_______M______| |
+--------------------------------------------------------------------------+
N Min Max Median Avg Stddev
x 30 5403 5490 5472 5455.8333 27.752705
+ 30 5354 5417 5404.5 5401.3667 13.694911
Difference at 95.0% confidence
-54.4667 +/- 11.3118
-0.99832% +/- 0.207334%
(Student's t, pooled s = 21.8834)
same machine as previous make -j16 buildworld
x base_j16_c12
+ 1ppq_j16_c12
+--------------------------------------------------------------------------+
| + x |
| + x |
| + + x |
| + + + x x |
| ++ + + + xxxxx |
| ++ + + * xxxxx |
|+ + + *+*+*+* *++ x xxxxx x x x|
| |________A_M_____| |____________A____M_______| |
+--------------------------------------------------------------------------+
N Min Max Median Avg Stddev
x 30 4877 4976 4955.5 4943.4667 29.205259
+ 30 4812 4899 4885.5 4881.1333 18.63392
Difference at 95.0% confidence
-62.3333 +/- 12.6627
-1.26092% +/- 0.256149%
(Student's t, pooled s = 24.4966)
CPU: Intel(R) Xeon(R) CPU X7560 @ 2.27GHz (2261.05-MHz K8-class CPU) FreeBSD/SMP: 4 package(s) x 8 core(s) x 2 hardware threads head r315421 make -j32 buildworld
x base_j32_c64
+ 1ppq_j32_c64
+--------------------------------------------------------------------------+
| + x |
| + + x xx |
| + + ++ +x+ * xxx x |
|+ +x x + + + ++ +***+***+x* xxxxx ** x* x|
| |__________|_A_M______A_M_|______| |
+--------------------------------------------------------------------------+
N Min Max Median Avg Stddev
x 30 1796 1857 1836 1833.3333 11.966428
+ 30 1775 1849 1825.5 1823.2333 14.116958
Difference at 95.0% confidence
-10.1 +/- 6.76431
-0.550909% +/- 0.368962%
(Student's t, pooled s = 13.0859)
same machine as previous cpuset -l 32-63 make -j40 buildworld
x base_j40_c32
+ 1ppq_j40_c32
+--------------------------------------------------------------------------+
| x + |
| x + |
| x x+* xx |
| xxx***+x* x |
|+ x +x + x + + ++ **x***+**x**++ + +|
| |__|____________A__MM________|__| |
+--------------------------------------------------------------------------+
N Min Max Median Avg Stddev
x 30 2264 2342 2331.5 2327.3667 18.217997
+ 30 2260 2363 2333 2327.2667 22.420639
No difference proven at 95.0% confidence