[Bugs] [Bug 1348519] New: NFS write speed are slow when using as shared storage in virtualisation

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1348519

            Bug ID: 1348519
           Summary: NFS write speed are slow when using as shared storage
                    in virtualisation
           Product: GlusterFS
           Version: 3.7.2
         Component: nfs
          Severity: high
          Assignee: bugs at gluster.org
          Reporter: steiner.joel at gmail.com
                CC: bugs at gluster.org



Description of problem:


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

Xenserver 6.5 sp1 Host all updates

Write speed when mounting glusterfs as nfs in fstab in xenhost i get 100MB w/s

fstab entry:
192.168.0.33:/sr-tier2 /mnt/glusterfs nfs rw,hard,intr,rsize=8096,wsize=8096 0
0

mtab entry (from created SR Storage of xen that VM's using):
192.168.0.33:/sr-tier2/63aba108-3684-a37d-49ef-8b36018c05e7
/var/run/sr-mount/63aba108-3684-a37d-49ef-8b36018c05e7 nfs
rw,tcp,hard,rsize=1048576,wsize=1048576,addr=192.168.0.33 0 0


2x Centos 7 Guest VM with GFS 3.7 and NFS

volume replica with 2 nodes

Speed test inside GFS VM with mounted glusterfs -> 250 MB/s (Glusterfs itself
seems to be good but nfs server cuts performance)

Centos 6.8 test vm which is running from the gfs shared nfs

Write speed inside the test vm is at 30mb/s <--- PROBLEM
Read speed inside the test vm is at 130mb/s

How reproducible:

use gfs as shared nfs storage for xen.

Steps to Reproduce:
1. Create gluster volume with nfs
2. Mount NFS in XenCenter and also mount the nfs share inside xen with fstab
mount
3. Copy Test VM on it
4. on both NFS native mount and SR make tests with hdparm and dd

Actual results:

VM writes very slow
VM reads are good

Expected results:

VM writes equal to the speed of when xen mounting nfs nativly.

Additional info:

nfs async could perform better write speed in nfs. so i've tried the following
paramaters inside gluster

nfs.trusted-sync  
nfs.trusted-write

with on and off because there it seems to treat packages as async, but i did
not see any difference when adjusting them?

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