Description of problem:
-----------------------

**The intent of opening this BZ is to compare large file I/O throughputs on gNFS and Ganesha v4 mounts,and to reduce the magnitude of difference between the two. **

Large file I/O is comparatively slower on Ganesha v4 mounts than gNFS,under the exact same workload and environment.

Details in comments.

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

nfs-ganesha-2.4.0-2.el7rhgs.x86_64
glusterfs-ganesha-3.8.4-2.el7rhgs.x86_64

How reproducible:
-----------------

100%

Steps to Reproduce:
-------------------

Run iozone in a distributed multithreaded way from 1/4 clients : 

iozone -+m <conf file> -+h <hostname> -C -w -c -e -i 0 -+n -r 64k -s 8g -t 16

Actual results:
---------------

There is a difference in throughputs (almost 75% in some cases) between gNFS and Ganesha v4 under the same workload. 

Expected results:
-----------------

The difference between the two should be not be as pronounced as is being seen atm.

Additional info:
----------------

Vol Type  : 2*2,Dist Rep
Client and Server OS : RHEL 7

Server Profiles will be updated once https://bugzilla.redhat.com/show_bug.cgi?id=1381353 is fixed.