Comment # 1 on bug 1131437 from Jan Kara

Excerpt from marvin7 global-dhp__io-dbench4-async-xfs-nosecure results:

Amean     1     20.05    ( 0.00%)    32.72    ( -63.16%)
Amean     2     21.07    ( 0.00%)    29.75    ( -41.18%)
Amean     4     26.75    ( 0.00%)    34.36    ( -28.42%)
Amean     8     38.10    ( 0.00%)    44.60    ( -17.03%)
Amean     16    64.19    ( 0.00%)    68.59    ( -6.86%)
Amean     32    123.59    ( 0.00%)    129.22    ( -4.56%)
Amean     64    432.81    ( 0.00%)    294.08    ( 32.05%)
Stddev     1     1.21    ( 0.00%)    4.70    (-288.82%)
Stddev     2     1.34    ( 0.00%)    8.00    (-497.46%)
Stddev     4     2.94    ( 0.00%)    7.38    (-151.14%)
Stddev     8     6.61    ( 0.00%)    8.90    ( -34.55%)
Stddev     16    15.70    ( 0.00%)    13.24    ( 15.66%)
Stddev     32    39.10    ( 0.00%)    21.01    ( 46.27%)
Stddev     64    163.76    ( 0.00%)    42.91    ( 73.79%)