• Terrible SMB Performance

    Baffled with super slow SMB performance to and from a new headless setup. I am getting about 1.2 MB/sec pull from and 3.2 MB/sec push to the server in question.

    full smb.conf file

    # This is the main Samba configuration file. You should read the
    # smb.conf(5) manual page in order to understand the options listed
    # here. Samba has a huge number of configurable options (perhaps too
    # many!) most of which are not shown in this example
    # For a step to step guide on installing, configuring and using samba, 
    # read the Samba-HOWTO-Collection. This may be obtained from:
    #  http://www.samba.org/samba/docs/Samba-HOWTO-Collection.pdf
    # Many working examples of smb.conf files can be found in the 
    # Samba-Guide which is generated daily and can be downloaded from: 
    #  http://www.samba.org/samba/docs/Samba-Guide.pdf
    # Any line which starts with a ; (semi-colon) or a # (hash) 
    # is a comment and is ignored. In this example we will use a #
    # for commentry and a ; for parts of the config file that you
    # may wish to enable
    # NOTE: Whenever you modify this file you should run the command "testparm"
    # to check that you have not made any basic syntactic errors. 
    #======================= Global Settings =====================================
    # Prevent some folders being converted to old DOS 8.3 style formatting.
       mangled names = no
    # workgroup = NT-Domain-Name or Workgroup-Name, eg: MIDEARTH
       workgroup = MYGROUP
    # server string is the equivalent of the NT Description field
       server string = Templar-Archives
    # Server role. Defines in which mode Samba will operate. Possible
    # values are "standalone server", "member server", "classic primary
    # domain controller", "classic backup domain controller", "active
    # directory domain controller".
    # Most people will want "standalone server" or "member server".
    # Running as "active directory domain controller" will require first
    # running "samba-tool domain provision" to wipe databases and create a
    # new domain.
       server role = standalone server
    # This option is important for security. It allows you to restrict
    # connections to machines which are on your local network. The
    # following example restricts access to two C class networks and
    # the "loopback" interface. For more examples of the syntax see
    # the smb.conf man page
    ;   hosts allow = 192.168.1. 192.168.2. 127.
    # Uncomment this if you want a guest account, you must add this to /etc/passwd
    # otherwise the user "nobody" is used
    ;  guest account = pcguest
    # this tells Samba to use a separate log file for each machine
    # that connects
       log file = /usr/local/samba/var/log.%m
    # Put a capping on the size of the log files (in Kb).
       max log size = 50
    # Specifies the Kerberos or Active Directory realm the host is part of
    ;   realm = MY_REALM
    # Backend to store user information in. New installations should 
    # use either tdbsam or ldapsam. smbpasswd is available for backwards 
    # compatibility. tdbsam requires no further configuration.
    ;   passdb backend = tdbsam
    # Using the following line enables you to customise your configuration
    # on a per machine basis. The %m gets replaced with the netbios name
    # of the machine that is connecting.
    # Note: Consider carefully the location in the configuration file of
    #       this line.  The included file is read at that point.
    ;   include = /usr/local/samba/lib/smb.conf.%m
    # Configure Samba to use multiple interfaces
    # If you have multiple network interfaces then you must list them
    # here. See the man page for details.
    ;   interfaces = 
    # Where to store roving profiles (only for Win95 and WinNT)
    #        %L substitutes for this servers netbios name, %U is username
    #        You must uncomment the [Profiles] share below
    ;   logon path = \\%L\Profiles\%U
    # Windows Internet Name Serving Support Section:
    # WINS Support - Tells the NMBD component of Samba to enable it's WINS Server
    ;   wins support = yes
    # WINS Server - Tells the NMBD components of Samba to be a WINS Client
    #	Note: Samba can be either a WINS Server, or a WINS Client, but NOT both
    ;   wins server = w.x.y.z
    # WINS Proxy - Tells Samba to answer name resolution queries on
    # behalf of a non WINS capable client, for this to work there must be
    # at least one	WINS Server on the network. The default is NO.
    ;   wins proxy = yes
    # DNS Proxy - tells Samba whether or not to try to resolve NetBIOS names
    # via DNS nslookups. The default is NO.
       dns proxy = no 
    # These scripts are used on a domain controller or stand-alone 
    # machine to add or delete corresponding unix accounts
    ;  add user script = /usr/sbin/useradd %u
    ;  add group script = /usr/sbin/groupadd %g
    ;  add machine script = /usr/sbin/adduser -n -g machines -c Machine -d /dev/null -s /bin/false %u
    ;  delete user script = /usr/sbin/userdel %u
    ;  delete user from group script = /usr/sbin/deluser %u %g
    ;  delete group script = /usr/sbin/groupdel %g
    # attempt to fix slow Transfer speeds
    read raw = yes
    write raw = yes
    socket options = TCP_NODELAY IPTOS_LOWDELAY SO_RCVBUF=131072 SO_SNDBUF=131072
    min receivefile size = 16384
    use sendfile = true
    aio read size = 16384
    aio write size = 16384
    #============================ Share Definitions ==============================
       comment = Home Directory
       path = /home/ryan
       guest ok = no
       write list = ryan
       browseable = yes
       writable = yes
       comment = Kennedy's Dumping Ground
       path = /home/kennedy
       guest ok = no
       write list = kennedy, ryan
       browsable = yes
       writable = yes
    # Un-comment the following and create the netlogon directory for Domain Logons
    ; [netlogon]
    ;   comment = Network Logon Service
    ;   path = /usr/local/samba/lib/netlogon
    ;   guest ok = yes
    ;   writable = no
    ;   share modes = no
    # Un-comment the following to provide a specific roving profile share
    # the default is to use the user's home directory
    ;    path = /usr/local/samba/profiles
    ;    browseable = no
    ;    guest ok = yes
    # NOTE: If you have a BSD-style print system there is no need to 
    # specifically define each individual printer
       comment = All Printers
       path = /usr/spool/samba
       browseable = no
    # Set public = yes to allow user 'guest account' to print
       guest ok = no
       writable = no
       printable = yes
    # This one is useful for people to share files
    ;   comment = Temporary file space
    ;   path = /tmp
    ;   read only = no
    ;   public = yes
    # A publicly accessible directory, but read only, except for people in
    # the "staff" group
    ;   comment = Public Stuff
    ;   path = /home/samba
    ;   public = yes
    ;   writable = no
    ;   printable = no
    ;   write list = @staff
    # Other examples. 
    # A private printer, usable only by fred. Spool data will be placed in fred's
    # home directory. Note that fred must have write access to the spool directory,
    # wherever it is.
    ;   comment = Fred's Printer
    ;   valid users = fred
    ;   path = /homes/fred
    ;   printer = freds_printer
    ;   public = no
    ;   writable = no
    ;   printable = yes
    # A private directory, usable only by fred. Note that fred requires write
    # access to the directory.
    ;   comment = Fred's Service
    ;   path = /usr/somewhere/private
    ;   valid users = fred
    ;   public = no
    ;   writable = yes
    ;   printable = no
    # a service which has a different directory for each machine that connects
    # this allows you to tailor configurations to incoming machines. You could
    # also use the %U option to tailor it by user name.
    # The %m gets replaced with the machine name that is connecting.
    ;  comment = PC Directories
    ;  path = /usr/pc/%m
    ;  public = no
    ;  writable = yes
    # A publicly accessible directory, read/write to all users. Note that all files
    # created in the directory by users will be owned by the default user, so
    # any user with access can delete any other user's files. Obviously this
    # directory must be writable by the default user. Another user could of course
    # be specified, in which case all files would be owned by that user instead.
    ;   path = /usr/somewhere/else/public
    ;   public = yes
    ;   only guest = yes
    ;   writable = yes
    ;   printable = no
    # The following two entries demonstrate how to share a directory so that two
    # users can place files there that will be owned by the specific users. In this
    # setup, the directory should be writable by both users and should have the
    # sticky bit set on it to prevent abuse. Obviously this could be extended to
    # as many users as required.
    ;   comment = Mary's and Fred's stuff
    ;   path = /usr/somewhere/shared
    ;   valid users = mary fred
    ;   public = no
    ;   writable = yes
    ;   printable = no
    ;   create mask = 0765
  • I don’t have a server, just a small NAS.
    but I think you should increase the “max log size” been only 50 Kb it mean it will do a lot of work writing log . The default is 5000 Kb and I have a bigger size.
    Hope this help you.

  • @saulosw Increasing log size did not help…

  • I’m not an expert but I think you can use Iperf or Iperf3 to track the problem,I see it’s been used by many network guy so it must be a good tools.

  • @saulosw iperf testing shows me about 40mbit… (5MB/sec) but speedtest-cli shows me 195-205Mbit U & 16-17Mbit D

  • I never used speedtest-cli, but as far as I know is used to test Internet speed with ookla so I’m not sure if it can be used to test the speed from pc to server.

  • @saulosw did speedtest-cli to at least see if i get proper speeds from that port to the net…

  • @Nymmie
    Is the server meant to be used only in a local network? Then maybe it should be better protected from the outside world. Something like:

    hosts allow =
    hosts deny


    Configuring samba is not easy, so be careful what options to modify.

    Another idea (if possible in your case) is to use NFS instead of samba, since NFS is inherently much faster.

  • Solved… turns out there was some electrical work done in my building which negatively affected my powerline ethernet adapters majorly…

    Looks like I need to properly run some cat6 cable now…

performance11 smb3 terrible2 Posts 9Views 306
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