[Bugs] [Bug 1309462] New: Upgrade from 3.7.6 to 3.7.8 causes massive drop in write performance

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1309462

            Bug ID: 1309462
           Summary: Upgrade from 3.7.6 to 3.7.8 causes massive drop in
                    write performance
           Product: GlusterFS
           Version: 3.7.7
         Component: fuse
          Severity: high
          Assignee: bugs at gluster.org
          Reporter: tavis at eventbase.com
                CC: bugs at gluster.org



Description of problem:
We have several clusters running in a simple configuration, 3 servers with 1
brick each in Replicate mode (1x3)
After upgrading from 3.7.6 to 3.7.8 (which fixed many memory leaks, thanks!)
our write performance dropped to almost nothing.  Where we would get
60-100mB/sec we are now getting 1-4mB/sec

This seems to happen when using the Gluster fuse filesystem, if i mount the
volume as NFS it seems to work correctly.  Unfortunately we have experienced
stability using NFS in our environment so i cannot use this as a work around

Version-Release number of selected component (if applicable):
3.7.8

How reproducible:
I have created, from scratch, two seperate three node systems (yay for
automation.) and installed/created the gluster volume.

As well i have three other clusters that were upgraded (Softlayer, Online-Tech
and Azure) which are exhibiting the same problem


Steps to Reproduce:
1. Provision deploy three servers and create a gluster volume with, "gluster
volume create VOLUME_NAME replica 3 transport tcp $NODES"

Actual results:
Incredible unexplained poor write performance (read performance is okay)

Expected results:
Reasonable write performance

Additional info:
Let me know if you would like any additional information from my environment

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