[Bugs] [Bug 1476654] gluster-block default shard-size should be 64MB

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1476654



--- Comment #2 from Worker Ant <bugzilla-bot at gluster.org> ---
COMMIT: https://review.gluster.org/17919 committed in release-3.12 by
Shyamsundar Ranganathan (srangana at redhat.com) 
------
commit c81bcf072ceefead5708ac57672d1dab5e42f4b8
Author: Pranith Kumar K <pkarampu at redhat.com>
Date:   Wed Jul 26 20:27:08 2017 +0530

    group-gluster-block: Set default shard-block-size to 64MB

    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

     >BUG: 1475605
     >Change-Id: I4ed5441409df639e38c731ba0d140fe92902f25f
     >Signed-off-by: Pranith Kumar K <pkarampu at redhat.com>
     >Reviewed-on: https://review.gluster.org/17887
     >CentOS-regression: Gluster Build System <jenkins at build.gluster.org>
     >Smoke: Gluster Build System <jenkins at build.gluster.org>
     >Reviewed-by: Krutika Dhananjay <kdhananj at redhat.com>
     >(cherry picked from commit abfbc3eb821e144ddbfdc5d7da401557b52beaf1)

    BUG: 1476654
    Change-Id: I4ed5441409df639e38c731ba0d140fe92902f25f
    Signed-off-by: Pranith Kumar K <pkarampu at redhat.com>
    Reviewed-on: https://review.gluster.org/17919
    CentOS-regression: Gluster Build System <jenkins at build.gluster.org>
    Smoke: Gluster Build System <jenkins at build.gluster.org>
    Reviewed-by: Krutika Dhananjay <kdhananj at redhat.com>
    Reviewed-by: Niels de Vos <ndevos at redhat.com>
    Reviewed-by: Shyamsundar Ranganathan <srangana at redhat.com>

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