samba - Jul 2016 - Degraded performance using a Linux to Windows Samba/CIFS share

We have been having some performance issues that come and go with our Samba
share.  At the bottom you will see the smb.conf(I have removed all extra
information)

Summary:

We have a windows share that we access via windows and a couple Linux servers. 
The place we are seeing the most pain, probably because it is where the most IO
happens is from the Linux servers.  The main thing the Linux servers are doing,
are scanning the file system for files and checking to see what needs to process
next (file monitor).  These scans will go from taking seconds to hours when we
see the issues.  Please note these shares are comprised of both a lot of
directories and a lot of files.  Most of the directories are small and only have
a few files, but there are some large directories, and especially when we get
behind there are even more with a lot of files.  When we have noticed this
slowdown we have involved our systems, storage, networking, and application
teams, and no one is able to put their thumb on what is causing it.  We have
noticed that restarting the Linux(client) servers at least temporarily resolves
the slowness and things speed up for a time.  The majority of the time we are
processing without incident but have more frequently been getting been getting
into this state.  There is more data being added to this, but no recent large
jumps.  We have been running this same architecture for many years now.

It seems that there is either some locking, or caching that is happening that is
causing it to drag to halt.  Not all clients go bad at the same time, but it
seems that eventually when we get in this state all clients will eventually slow
down.  Storage teams have reported everything looks good from a disk
perspective.  Networking has reported the same.  The only thing the systems
teams have noticed and haven't been able to explain is high load when we get
in a bad state.

Please provide any input, suggestions, or configuration updates you may have.

#======================= Global Settings
====================================[global]
# ----------------------- Network Related Options -------------------------
   workgroup = TSH
   server string = Samba Server Version %v
   password server = xx.xx.xx.211 xx.xx.xxx.212
   realm = xxx.COM
   security = ads
   username map = /etc/samba/smbusers
   smb passwd file = /etc/samba/smbpasswd
   idmap uid = 16777216-33554431
   idmap gid = 16777216-33554431
   template shell = /bin/sh
   winbind use default domain = yes
   winbind offline logon = false
   unix password sync = yes
   passwd program = /usr/bin/passwd %u
   passwd chat = *New*password* %n *Retype*new*password* %n
*passwd:*all*authentication*token*updated*successfully*
   pam password change = yes
   obey pam restrictions = yes
   passdb backend = tdbsam
   log file = /var/log/samba/%m.log
   private dir = /var/
   encrypt passwords = yes
   netbios name = xxxxxP1
# --------------------------- Logging Options -----------------------------

# ----------------------- Domain Controller Options ------------------------

# ----------------------- Browser Control Options ----------------------------

#----------------------------- Name Resolution -------------------------------

# --------------------------- Printing Options -----------------------------
        load printers = yes
        cups options = raw
# --------------------------- Filesystem Options ---------------------------
        map hidden = no
        map read only = no
        store dos attributes = yes
        dos charset = CP850
        unix charset = UTF-8
        display charset = LOCALE
        mangling char = ~
        create mask = 0775
        directory mask = 0775
        acl check permissions = true
        acl compatibility = win2k
        inherit permissions = yes
#============================ Share Definitions
=============================[denshr]
        comment = Den Share for windows
        path = /opt/share/denshr
        browseable = yes
        writable = yes
        create mode = 0775
        valid users = xyz TSH\xyz
[test]
        comment = Den Share for windows
        path = /opt/tibco-tm
        browseable = yes
        writable = yes
        create mode = 0775
        valid users = xyz TSH\xyz


Brian