[Bugs] [Bug 1659327] 43% regression in small-file sequential read performance

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1659327



--- Comment #2 from Raghavendra G <rgowdapp at redhat.com> ---
Following are the runs from small-file workload 

   no-fixes-default-config                         | 
fixes-ob-without-anon-fd-child-of-qr              |  
fixes-ob-with-anon-fd-child-of-qr
                                                   |                           
                        |
append sum=7076.66 count=5 avg=1415.33             |append sum=7135.91 count=5
avg=1427.18              |append sum=7052.17 count=5 avg=1410.43
chmod sum=9146.32 count=5 avg=1829.26              |chmod sum=9207.25 count=5
avg=1841.45               |chmod sum=9245.51 count=5 avg=1849.10
create sum=13032.1 count=5 avg=2606.42             |create sum=12853.2 count=5
avg=2570.64              |create sum=13307.8 count=5 avg=2661.56
delete-renamed sum=8483.5 count=5 avg=1696.70      |delete-renamed sum=8676.86
count=5 avg=1735.37      |delete-renamed sum=8634.49 count=5 avg=1726.89
ls-l sum=40362.8 count=5 avg=8072.56               |ls-l sum=38522 count=5
avg=7704.40                  |ls-l sum=40140.9 count=5 avg=8028.18
mkdir sum=3419.6 count=5 avg=683.92                |mkdir sum=3639.08 count=5
avg=727.81                |mkdir sum=3708.42 count=5 avg=741.68
read sum=16703.9 count=5 avg=3340.78               |read sum=16340.8 count=5
avg=3268.16                |read sum=16074.7 count=5 avg=3214.94
rename sum=9828.65 count=5 avg=1965.73             |rename sum=10049.7 count=5
avg=2009.94              |rename sum=9983.86 count=5 avg=1996.77
rmdir sum=2341.03 count=5 avg=468.20               |rmdir sum=2419.4 count=5
avg=483.88                 |rmdir sum=2424.71 count=5 avg=484.94
stat sum=16763.5 count=5 avg=3352.70               |stat sum=16677.8 count=5
avg=3335.56                |stat sum=16870.2 count=5 avg=3374.04


Above runs clearly show fixes with 
1. qr as a parent of ob
2. use-anonymous-fd turned on in ob

give better performance when considered all operations holistically.

Just to complete the exercise I am going to schedule a run without any fixes
and qr loaded as a parent of ob and update the results.

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