Comment # 10 on bug 1131437 from Jan Kara

Results with Leap 15.0 kernel (4.12.14-lp150.11-default):

Amean      1       22.52 (   0.00%)       22.51 (   0.05%)       22.47 (  
0.21%)       22.26 (   1.12%)       22.29 (   1.02%)
Amean      2       24.02 (   0.00%)       24.28 (  -1.08%)       24.19 ( 
-0.69%)       24.30 (  -1.16%)       24.72 (  -2.92%)
Amean      4       29.15 (   0.00%)       28.86 (   1.00%)       28.83 (  
1.08%)       29.49 (  -1.17%)       29.12 (   0.10%)
Stddev     1        1.03 (   0.00%)        0.97 (   5.67%)        1.49 (
-44.48%)        1.40 ( -35.73%)        1.42 ( -36.98%)
Stddev     2        1.49 (   0.00%)        1.83 ( -22.74%)        1.70 (
-14.18%)        1.83 ( -23.22%)        1.75 ( -17.88%)
Stddev     4        2.95 (   0.00%)        3.07 (  -3.97%)        3.00 ( 
-1.60%)        2.85 (   3.47%)        3.12 (  -5.57%)

You can notice results are stable & also noticeably better for this machine.
Will try to narrow it down...