[Bugs] [Bug 1475605] New: gluster-block default shard-size should be 64MB

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1475605

            Bug ID: 1475605
           Summary: gluster-block default shard-size should be 64MB
           Product: GlusterFS
           Version: mainline
         Component: core
          Assignee: bugs at gluster.org
          Reporter: pkarampu at redhat.com
                CC: bugs at gluster.org



Description of problem:
    With 4MB shard size I/O slows down more because of the extra
    inodelk/xattrops in replicate. So increasing it to 64MB which
    gave better performance than 4MB.

    To simulate writes on a preallocated VM-image, fallocate the file and then
do
    dd with notrunc
    do "fallocate -l 1GB" then "dd if=/dev/zero of=file-1GB bs=1MB count=1024
conv=notrunc"

    These are the results on my laptop for dd:
    With 4MB:
          1.84    1357.37 us      19.00 us   12431.00 us           1188   
FINODELK
          2.45     255.08 us      58.00 us    4038.00 us           8428      
WRITE
         95.69   78967.76 us      30.00 us 20324240.00 us           1063   
FXATTROP

    With 64MB:
          0.13      59.36 us      15.00 us     814.00 us            657   
FINODELK
          6.02     225.53 us      69.00 us    6556.00 us           8205      
WRITE
         93.82  103015.12 us      32.00 us 13046368.00 us            280   
FXATTROP


Version-Release number of selected component (if applicable):


How reproducible:


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Expected results:


Additional info:

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