http://bugzilla.suse.com/show_bug.cgi?id=1131437
http://bugzilla.suse.com/show_bug.cgi?id=1131437#c8
--- Comment #8 from Jan Kara ---
OK, 4.20 results aren't stable either:
Amean 1 38.35 ( 0.00%) 38.01 ( 0.90%) 39.70 (
-3.52%) 39.47 ( -2.91%) 38.26 ( 0.24%)
Amean 2 35.02 ( 0.00%) 31.31 ( 10.61%) 30.80 (
12.05%) 35.20 ( -0.50%) 34.39 ( 1.81%)
Amean 4 42.70 ( 0.00%) 41.81 ( 2.09%) 41.64 (
2.47%) 37.73 ( 11.63%) 34.50 ( 19.20%)
Stddev 1 5.17 ( 0.00%) 5.29 ( -2.22%) 3.36 (
35.04%) 5.24 ( -1.35%) 5.19 ( -0.23%)
Stddev 2 8.41 ( 0.00%) 8.55 ( -1.64%) 8.53 (
-1.47%) 8.31 ( 1.24%) 8.71 ( -3.60%)
Stddev 4 6.49 ( 0.00%) 6.54 ( -0.87%) 6.22 (
4.14%) 7.07 ( -8.97%) 7.63 ( -17.63%)
*But* this is with SCSI_MQ driving the disk. I'll try whether the variance
won't be lower with the old block layer because upto 4.20 (including), we were
using that for SCSI devices AFAIK.
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