Comment # 12 on bug 1131437 from Jan Kara

4.18 vanilla kernel numbers:

Amean      1       27.80 (   0.00%)       26.42 (   4.99%)       26.98 (  
2.94%)       25.19 (   9.41%)       26.81 (   3.56%)
Amean      2       31.14 (   0.00%)       30.74 (   1.30%)       34.20 ( 
-9.82%)       34.22 (  -9.88%)       31.36 (  -0.71%)
Amean      4       37.22 (   0.00%)       41.98 ( -12.78%)       39.83 ( 
-7.01%)       33.91 (   8.90%)       41.87 ( -12.49%)
Stddev     1        7.47 (   0.00%)        6.63 (  11.34%)        7.09 (  
5.14%)        5.18 (  30.62%)        6.73 (  10.00%)
Stddev     2        8.42 (   0.00%)        8.05 (   4.43%)        8.13 (  
3.49%)        8.46 (  -0.48%)        8.37 (   0.53%)
Stddev     4        8.84 (   0.00%)        6.54 (  26.01%)        6.06 ( 
31.48%)        7.32 (  17.27%)        6.94 (  21.56%)

Better numbers overall but still unstable. I guess I'll check that
a) intel_idle.max_cstate=1 still fixes instability with 4.18
b) what is missing wrt scheduler / cpufreq in 4.18 compared to what we have in
Leap 15.0.