http://bugzilla.suse.com/show_bug.cgi?id=1131437
http://bugzilla.suse.com/show_bug.cgi?id=1131437#c13
--- Comment #13 from Jan Kara ---
4.18 vanilla kernel numbers with intel_idle.max_cstate=1:
Amean 1 26.78 ( 0.00%) 26.63 ( 0.55%) 29.06 (
-8.51%) 26.06 ( 2.70%) 26.81 ( -0.09%)
Amean 2 31.79 ( 0.00%) 31.85 ( -0.19%) 32.54 (
-2.36%) 34.30 ( -7.90%) 33.63 ( -5.78%)
Amean 4 39.09 ( 0.00%) 41.04 ( -4.99%) 37.31 (
4.55%) 38.27 ( 2.09%) 35.77 ( 8.49%)
Stddev 1 3.31 ( 0.00%) 3.60 ( -8.60%) 5.65 (
-70.56%) 2.67 ( 19.45%) 3.98 ( -20.17%)
Stddev 2 6.04 ( 0.00%) 5.86 ( 2.84%) 5.76 (
4.61%) 6.33 ( -4.83%) 5.84 ( 3.21%)
Stddev 4 5.90 ( 0.00%) 5.69 ( 3.56%) 6.69 (
-13.35%) 6.26 ( -6.13%) 6.62 ( -12.13%)
So not significantly different to numbers without intel_idle.max_cstate=1. But
variation is about comparable to the one with 5.0 and intel_idle.max_cstate=1
(comment 5).
I also did 4.18 run with intel_idle.max_cstate=1 and 'performance' frequency
governor. Results are:
Amean 1 25.07 ( 0.00%) 25.04 ( 0.13%) 25.06 (
0.07%) 25.03 ( 0.19%) 25.03 ( 0.18%)
Amean 2 28.16 ( 0.00%) 27.20 ( 3.42%) 27.21 (
3.38%) 27.47 ( 2.46%) 27.75 ( 1.45%)
Amean 4 29.58 ( 0.00%) 29.50 ( 0.27%) 30.03 (
-1.50%) 30.57 ( -3.33%) 29.49 ( 0.31%)
Stddev 1 0.59 ( 0.00%) 0.70 ( -19.15%) 0.55 (
6.57%) 0.56 ( 5.15%) 0.54 ( 9.03%)
Stddev 2 1.41 ( 0.00%) 1.49 ( -5.43%) 1.46 (
-3.51%) 1.10 ( 22.32%) 1.24 ( 12.20%)
Stddev 4 2.62 ( 0.00%) 2.71 ( -3.30%) 2.75 (
-4.91%) 2.78 ( -6.16%) 3.14 ( -19.70%)
So in this case the variation is significantly reduced. I'll see if I can
identify which patches make Leap 15.0 kernel similarly stable.
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