[Bugs] [Bug 1365449] New: [Perf] : Large file writes are slow on Ganesha mounts

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1365449

            Bug ID: 1365449
           Summary: [Perf] : Large file writes are slow on Ganesha mounts
           Product: GlusterFS
           Version: 3.8.1
         Component: ganesha-nfs
          Severity: urgent
          Assignee: bugs at gluster.org
          Reporter: asoman at redhat.com
                CC: bugs at gluster.org



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

Any kind of writes (sequential or random) are slow on Ganesha v3 and v4 mounts.

This is the cumulative output from 16 iozone writers :

*Sequential Writes*

Ganesha,v3 : 373037 kB/sec
Ganesha,v4 : 458696.5 kB/sec
GlusterNFS : 1287326 kB/sec

*Random Writes* 

Ganesha,v3 : 53497 kB/sec
Ganesha,v4 : 88717.35 kB/sec
GlusterNFS : 351374.5 kB/sec

Server profiles will be attached to the bug soon.


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

glusterfs-server-3.8.1-0.4.git56fcf39.el7rhgs.x86_64
nfs-ganesha-gluster-2.4-0.dev.26.el7rhgs.x86_64
pacemaker-libs-1.1.13-10.el7.x86_64
pcs-0.9.143-15.el7.x86_64


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

Every which way I try.

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

Run Iozone Seq Writes on Ganesha mounts in a distributed multithreaded way :

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


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

Seq/Random Writes  are slow.

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

Writes should not be this slow.


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

Volume Name: testvol
Type: Distributed-Replicate
Volume ID: 3ee2c046-939b-4915-908b-859bfcad0840
Status: Started
Number of Bricks: 2 x 2 = 4
Transport-type: tcp
Bricks:
Brick1: gqas001.sbu.lab.eng.bos.redhat.com:/bricks/testvol_brick0
Brick2: gqas014.sbu.lab.eng.bos.redhat.com:/bricks/testvol_brick1
Brick3: gqas015.sbu.lab.eng.bos.redhat.com:/bricks/testvol_brick2
Brick4: gqas016.sbu.lab.eng.bos.redhat.com:/bricks/testvol_brick3
Options Reconfigured:
client.event-threads: 4
server.event-threads: 4
cluster.lookup-optimize: on
ganesha.enable: on
features.cache-invalidation: on
nfs.disable: on
performance.readdir-ahead: on
performance.stat-prefetch: off
server.allow-insecure: on
nfs-ganesha: enable
cluster.enable-shared-storage: enable

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