Is your Samba slow?

Samba file sharing is great, but performance under Samba’s default configuration is fairly poor.

Here are a few options that I add to my smb.conf to get the speed that I need:

[global]

# FORCE THE DISK SYSTEM TO ALLOCATE REAL STORAGE BLOCKS WHEN
# A FILE IS CREATED OR EXTENDED TO BE A GIVEN SIZE.
# THIS IS ONLY A GOOD OPTION FOR FILE SYSTEMS THAT SUPPORT
# UNWRITTEN EXTENTS LIKE XFS, EXT4, BTRFS, OCS2.
# IF YOU USE A FILE SYSTEM THAT DOES NOT SUPPORT UNWRITTEN
# EXTENTS, SET "strict allocate = no".
# NOTE: MAY WASTE DRIVE SPACE EVEN ON SUPPORTED FILE SYSTEMS
# SEE: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=798532

   strict allocate = Yes

# THIS IS TO COUNTERACT SPACE WASTAGE THAT CAN BE 
# CAUSED BY THE PREVIOUS OPTION 
# SEE: https://lists.samba.org/archive/samba-technical/2014-July/101304.html

   allocation roundup size = 4096

# ALLOW READS OF 65535 BYTES IN ONE PACKET.
# THIS TYPICALLY PROVIDES A MAJOR PERFORMANCE BENEFIT.

   read raw = Yes

# SERVER SIGNING SLOWS THINGS DOWN WHEN ENABLED.
# THIS WAS DISABLED BY DEFAULT PRIOR TO SAMBA 4.
# Thanks to Joe in the comments section!

   server signing = No

# SUPPORT RAW WRITE SMBs WHEN TRANSFERRING DATA FROM CLIENTS.

   write raw = Yes

# WHEN "strict locking = no", THE SERVER PERFORMS FILE LOCK
# CHECKS ONLY WHEN THE CLIENT EXPLICITLY ASKS FOR THEM.
# WELL-BEHAVED CLIENTS ALWAYS ASK FOR LOCK CHECKS WHEN IT IS
# IMPORTANT, SO IN THE VAST MAJORITY OF CASES,
# "strict locking = auto" OR "strict locking = no" IS ACCEPTABLE.

   strict locking = No

# TCP_NODELAY:
#    SEND AS MANY PACKETS AS NECESSARY TO KEEP DELAY LOW
# IPTOS_LOWDELAY:
#    [Linux IPv4 Tweak] MINIMIZE DELAYS FOR INTERACTIVE TRAFFIC
# SO_RCVBUF:
#    ENLARGE SYSTEM SOCKET RECEIVE BUFFER
# SO_SNDBUF:
#    ENLARGE SYSTEM SOCKET SEND BUFFER

   socket options = TCP_NODELAY IPTOS_LOWDELAY SO_RCVBUF=131072 SO_SNDBUF=131072

# SMBWriteX CALLS GREATER THAN "min receivefile size" WILL BE
# PASSED DIRECTLY TO KERNEL recvfile/splice SYSTEM CALL.
# TO ENABLE POSIX LARGE WRITE SUPPORT (SMB/CIFS WRITES UP TO 16MB),
# THIS OPTION MUST BE NONZERO.
# THIS OPTION WILL HAVE NO EFFECT IF SET ON A SMB SIGNED CONNECTION.
# MAX VALUE = 128k

   min receivefile size = 16384

# USE THE MORE EFFICIENT sendfile() SYSTEM CALL FOR EXCLUSIVELY
# OPLOCKED FILES.
# NOTE: ONLY FOR CLIENTS HIGHER THAN WINDOWS 98/Me

   use sendfile = Yes

# READ FROM FILE ASYNCHRONOUSLY WHEN SIZE OF REQUEST IS BIGGER
# THAN THIS VALUE.
# NOTE: SAMBA MUST BE BUILT WITH ASYNCHRONOUS I/O SUPPORT

   aio read size = 16384

# WRITE TO FILE ASYNCHRONOUSLY WHEN SIZE OF REQUEST IS BIGGER
# THAN THIS VALUE
# NOTE: SAMBA MUST BE BUILT WITH ASYNCHRONOUS I/O SUPPORT

   aio write size = 16384

A few other references:


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Responses (14)

  • Thanks for sharing.

    Reply
  • Thanks! Can you give us some examples of speeds that you achieved before and after, and some details about the hardware you used to run your tests?

    Reply
    • Dave, My particular setup is a Core i3 and a 7200 RPM SATA drive. I went from 25 MB/sec pre-config to 115 MB/sec post-config (which happens to be the same speed I get when directly accessing the drive). Unless you have an SSD or a RAID pool with lots of IOPS, the drive is going to be the bottleneck.

  • Thanks for your reply. I made the same changes (excluding the allocate tweaks) on my FreeBSD 10.3-RELEASE Samba 4.3 (ZFS) server and got no change at all. I get up/down speeds of ~24MB/s, even though I am able to SCP data up/down at around 80MB/s, and my ZFS array is capable of even faster speeds. Any other tips?

    Reply
    • Not sure if all of the "socket options" are applicable to FreeBSD. Also, "strict allocate = Yes" makes a pretty big difference.

      I did this under Linux. As for what low-level twiddling will get it up-to-par on FreeBSD (if that is even possible), I'd love to find out.

  • Some of use run enterprise storage and so we often go over 1GB/sec. IOPS might not be there, but general performance is usually well into the hundreds of MBs/sec across the board. I've been usting ATTO Disk benchmark (older version) to test our Samba from Windows, does anyone have a recommendation for something they like to use? ATTO values overflow (just says zero) past 1GB/sec. Newer versions of ATTO doesn't let you run against anything but local drives (not NAS).

    Reply
  • Thanks a lot for the parameters. It went up from 15MB/s to 60MB/s running a asrock itx1900 board with 4GB RAM and just 2 old 1TB Samsung Spin Point F1 HDDs configured to be a mdadm Raid 1. System is Running Debian 8.6. Tanks for making the page

    Reply
  • Excuse me where to write this configuration in smb.conf??

    Reply
    • Under the [global] section. Just updated the post.

      Thanks!

  • I was having slowness issues. I setup samba as a Primary Domain Controller. I had nice gigabit hardware: Intel nics, Netgear 24port gigabit switch gs724t. A Windows to Windows file transfer would saturate my gigabit connection at over 100MB/s (that's gigabits to megabytes!). However any transfers from Windows to or from Samba would not go over 60MB/s. None of the options above worked. Until I ran "top" on my Linux box and noticed that smbd was consuming 100% of the processor's time. I found somewhere else on the internet that disabling server signing fixed the issue.

    Storage speeds should not be an issue if you have 7200 RPM drives with SATA-2 or higher. I have a Western Digital blue 500GB that can write speeds at 150MB/s (large files of course) with ease. A gigabit connection isn't going to go over too much more than 110MB/s.

    So, in review check "top" during a file transfer and see if Samba (smbd) is going gang busters with your CPU. Although some issues will be fixed with the above options others will not. I'm only posting this because it took me several days to figure out my issue and maybe it'll help someone else!

    Reply
    • Joe,

      Which version of Samba are you running?

      I'm on 4.2.14-Debian, with a server signing value of default.

      You can use testparm -vs to list all current settings.

      P.S.> Thanks for the heads-up!

    • sorry, 4.6.5 from source.

    • # Global parameters
      [global]
      	bind interfaces only = No
      	config backend = file
      	dos charset = CP850
      	enable core files = Yes
      	interfaces = 
      	multicast dns register = Yes
      	netbios aliases = 
      	netbios name = DC1
      	netbios scope = 
      	realm = *********.COM
      	server services = s3fs, rpc, nbt, wrepl, ldap, cldap, kdc, drepl, winbindd, ntp_signd, kcc, dnsupdate, dns
      	server string = Samba 4.6.5
      	share backend = classic
      	unix charset = UTF-8
      	workgroup = ******
      	browse list = Yes
      	domain master = Auto
      	enhanced browsing = Yes
      	lm announce = Auto
      	lm interval = 60
      	local master = Yes
      	os level = 20
      	preferred master = Auto
      	allow dns updates = secure only
      	dns forwarder = 192.168.0.1
      	dns update command = /usr/local/samba/sbin/samba_dnsupdate
      	machine password timeout = 604800
      	nsupdate command = /usr/bin/nsupdate -g
      	rndc command = /usr/sbin/rndc
      	spn update command = /usr/local/samba/sbin/samba_spnupdate
      	mangle prefix = 1
      	mangling method = hash2
      	max stat cache size = 256
      	stat cache = Yes
      	client ldap sasl wrapping = sign
      	ldap admin dn = 
      	ldap connection timeout = 2
      	ldap delete dn = No
      	ldap deref = auto
      	ldap follow referral = Auto
      	ldap group suffix = 
      	ldap idmap suffix = 
      	ldap machine suffix = 
      	ldap page size = 1000
      	ldap passwd sync = no
      	ldap replication sleep = 1000
      	ldap server require strong auth = Yes
      	ldap ssl = start tls
      	ldap ssl ads = No
      	ldap suffix = 
      	ldap timeout = 15
      	ldap user suffix = 
      	lock spin time = 200
      	oplock break wait time = 0
      	smb2 leases = Yes
      	debug class = No
      	debug hires timestamp = Yes
      	debug pid = No
      	debug prefix timestamp = No
      	debug uid = No
      	ldap debug level = 0
      	ldap debug threshold = 10
      	log file = 
      	logging = 
      	log level = 2
      	max log size = 5000
      	syslog = 1
      	syslog only = No
      	timestamp logs = Yes
      	abort shutdown script = 
      	add group script = 
      	add machine script = 
      	add user script = 
      	add user to group script = 
      	allow nt4 crypto = No
      	delete group script = 
      	delete user from group script = 
      	delete user script = 
      	domain logons = No
      	enable privileges = Yes
      	init logon delay = 100
      	init logon delayed hosts = 
      	logon drive = 
      	logon home = \\%N\%U
      	logon path = \\%N\%U\profile
      	logon script = 
      	reject md5 clients = No
      	set primary group script = 
      	shutdown script = 
      	add share command = 
      	afs token lifetime = 604800
      	afs username map = 
      	allow insecure wide links = No
      	async smb echo handler = No
      	auto services = 
      	cache directory = /usr/local/samba/var/cache
      	change notify = Yes
      	change share command = 
      	cluster addresses = 
      	clustering = No
      	config file = 
      	ctdbd socket = 
      	ctdb locktime warn threshold = 0
      	ctdb timeout = 0
      	default service = 
      	delete share command = 
      	homedir map = auto.home
      	kernel change notify = Yes
      	lock directory = /usr/local/samba/var/lock
      	log writeable files on exit = No
      	message command = 
      	nbt client socket address = 0.0.0.0
      	ncalrpc dir = /usr/local/samba/var/run/ncalrpc
      	NIS homedir = No
      	nmbd bind explicit broadcast = Yes
      	panic action = 
      	perfcount module = 
      	pid directory = /usr/local/samba/var/run
      	registry shares = No
      	remote announce = 
      	remote browse sync = 
      	reset on zero vc = No
      	smbd profiling level = off
      	state directory = /usr/local/samba/var/locks
      	usershare allow guests = No
      	usershare max shares = 0
      	usershare owner only = Yes
      	usershare path = /usr/local/samba/var/locks/usershares
      	usershare prefix allow list = 
      	usershare prefix deny list = 
      	usershare template share = 
      	utmp = No
      	utmp directory = 
      	wtmp directory = 
      	addport command = 
      	addprinter command = 
      	cups connection timeout = 30
      	cups encrypt = No
      	cups server = 
      	deleteprinter command = 
      	disable spoolss = No
      	enumports command = 
      	iprint server = 
      	load printers = Yes
      	lpq cache time = 30
      	os2 driver map = 
      	printcap cache time = 750
      	printcap name = 
      	show add printer wizard = Yes
      	cldap port = 389
      	client ipc max protocol = default
      	client ipc min protocol = default
      	client max protocol = default
      	client min protocol = CORE
      	client use spnego = Yes
      	dcerpc endpoint servers = epmapper, wkssvc, rpcecho, samr, netlogon, lsarpc, drsuapi, dssetup, unixinfo, browser, eventlog6, backupkey, dnsserver
      	defer sharing violations = Yes
      	dgram port = 138
      	disable netbios = No
      	enable asu support = No
      	eventlog list = 
      	large readwrite = Yes
      	lsa over netlogon = No
      	max mux = 50
      	max ttl = 259200
      	max wins ttl = 518400
      	max xmit = 16644
      	min receivefile size = 16384
      	min wins ttl = 21600
      	name resolve order = lmhosts wins host bcast
      	nbt port = 137
      	nt pipe support = Yes
      	nt status support = Yes
      	read raw = Yes
      	rpc big endian = No
      	rpc server port = 0
      	server max protocol = SMB3
      	server min protocol = LANMAN1
      	server multi channel support = No
      	smb2 max credits = 8192
      	smb2 max read = 8388608
      	smb2 max trans = 8388608
      	smb2 max write = 8388608
      	smb ports = 445 139
      	svcctl list = 
      	time server = No
      	unicode = Yes
      	unix extensions = Yes
      	use spnego = Yes
      	web port = 901
      	write raw = Yes
      	algorithmic rid base = 1000
      	allow dcerpc auth level connect = No
      	allow trusted domains = Yes
      	auth methods = 
      	check password script = 
      	client ipc signing = default
      	client lanman auth = No
      	client NTLMv2 auth = Yes
      	client plaintext auth = No
      	client schannel = Auto
      	client signing = default
      	client use spnego principal = No
      	dedicated keytab file = 
      	encrypt passwords = Yes
      	guest account = nobody
      	kerberos encryption types = all
      	kerberos method = default
      	kpasswd port = 464
      	krb5 port = 88
      	lanman auth = No
      	log nt token command = 
      	map to guest = Never
      	map untrusted to domain = No
      	ntlm auth = No
      	ntp signd socket directory = /usr/local/samba/var/lib/ntp_signd
      	null passwords = No
      	obey pam restrictions = No
      	old password allowed period = 60
      	pam password change = No
      	passdb backend = samba_dsdb
      	passdb expand explicit = No
      	passwd chat = *new*password* %n\n *new*password* %n\n *changed*
      	passwd chat debug = No
      	passwd chat timeout = 2
      	passwd program = 
      	password hash gpg key ids = 
      	password server = *
      	preload modules = 
      	private dir = /usr/local/samba/private
      	raw NTLMv2 auth = No
      	rename user script = 
      	restrict anonymous = 0
      	root directory = 
      	samba kcc command = /usr/local/samba/sbin/samba_kcc
      	security = AUTO
      	server role = active directory domain controller
      	server schannel = Auto
      	server signing = No
      	smb passwd file = /usr/local/samba/private/smbpasswd
      	tls cafile = tls/ca.pem
      	tls certfile = tls/cert.pem
      	tls crlfile = 
      	tls dh params file = 
      	tls enabled = Yes
      	tls keyfile = tls/key.pem
      	tls priority = NORMAL:-VERS-SSL3.0
      	tls verify peer = as_strict_as_possible
      	unix password sync = No
      	username level = 0
      	username map = 
      	username map cache time = 0
      	username map script = 
      	aio max threads = 100
      	deadtime = 0
      	getwd cache = Yes
      	hostname lookups = No
      	keepalive = 300
      	max disk size = 0
      	max open files = 16384
      	max smbd processes = 0
      	name cache timeout = 660
      	socket options = TCP_NODELAY IPTOS_LOWDELAY SO_RCVBUF=131072 SO_SNDBUF=131072
      	use mmap = Yes
      	get quota command = 
      	host msdfs = Yes
      	set quota command = 
      	create krb5 conf = Yes
      	idmap backend = tdb
      	idmap cache time = 604800
      	idmap gid = 
      	idmap negative cache time = 120
      	idmap uid = 
      	include system krb5 conf = Yes
      	neutralize nt4 emulation = No
      	reject md5 servers = No
      	require strong key = Yes
      	template homedir = /home/%D/%U
      	template shell = /bin/false
      	winbind cache time = 300
      	winbindd privileged socket directory = /usr/local/samba/var/lib/winbindd_privileged
      	winbindd socket directory = /usr/local/samba/var/run/winbindd
      	winbind enum groups = No
      	winbind enum users = No
      	winbind expand groups = 0
      	winbind max clients = 200
      	winbind max domain connections = 1
      	winbind nested groups = Yes
      	winbind normalize names = No
      	winbind nss info = template
      	winbind offline logon = No
      	winbind reconnect delay = 30
      	winbind refresh tickets = No
      	winbind request timeout = 60
      	winbind rpc only = No
      	winbind sealed pipes = Yes
      	winbind separator = \
      	winbind trusted domains only = No
      	winbind use default domain = No
      	dns proxy = Yes
      	wins hook = 
      	wins proxy = No
      	wins server = 
      	wins support = No
      	rpc_server:tcpip = no
      	rpc_daemon:spoolssd = embedded
      	rpc_server:spoolss = embedded
      	rpc_server:winreg = embedded
      	rpc_server:ntsvcs = embedded
      	rpc_server:eventlog = embedded
      	rpc_server:srvsvc = embedded
      	rpc_server:svcctl = embedded
      	rpc_server:default = external
      	winbindd:use external pipes = true
      	idmap config * : backend = tdb
      	comment = 
      	path = 
      	administrative share = No
      	browseable = Yes
      	case sensitive = Auto
      	default case = lower
      	delete veto files = No
      	hide dot files = Yes
      	hide files = 
      	hide special files = No
      	hide unreadable = No
      	hide unwriteable files = No
      	mangled names = Yes
      	mangling char = ~
      	map archive = No
      	map hidden = No
      	map readonly = no
      	map system = No
      	preserve case = Yes
      	short preserve case = Yes
      	store dos attributes = Yes
      	veto files = 
      	veto oplock files = 
      	blocking locks = Yes
      	csc policy = manual
      	fake oplocks = No
      	kernel oplocks = No
      	kernel share modes = Yes
      	level2 oplocks = Yes
      	locking = Yes
      	oplock contention limit = 2
      	oplocks = Yes
      	posix locking = Yes
      	strict locking = Auto
      	afs share = No
      	available = Yes
      	copy = 
      	delete readonly = No
      	dfree cache time = 0
      	dfree command = 
      	directory name cache size = 100
      	dmapi support = No
      	dont descend = 
      	dos filemode = No
      	dos filetime resolution = No
      	dos filetimes = Yes
      	fake directory create times = No
      	follow symlinks = Yes
      	fstype = NTFS
      	include = 
      	magic output = 
      	magic script = 
      	postexec = 
      	preexec = 
      	preexec close = No
      	root postexec = 
      	root preexec = 
      	root preexec close = No
      	spotlight = No
      	volume = 
      	wide links = No
      	cups options = 
      	default devmode = Yes
      	force printername = No
      	lppause command = 
      	lpq command = %p
      	lpresume command = 
      	lprm command = 
      	max print jobs = 1000
      	max reported print jobs = 0
      	printable = No
      	print command = 
      	printer name = 
      	printing = cups
      	printjob username = %U
      	print notify backchannel = No
      	queuepause command = 
      	queueresume command = 
      	use client driver = No
      	acl allow execute always = No
      	acl check permissions = Yes
      	acl map full control = Yes
      	durable handles = Yes
      	ea support = No
      	map acl inherit = No
      	nt acl support = Yes
      	profile acls = No
      	access based share enum = No
      	acl group control = No
      	admin users = 
      	create mask = 0744
      	directory mask = 0755
      	force create mode = 0000
      	force directory mode = 0000
      	force group = 
      	force unknown acl user = No
      	force user = 
      	guest ok = No
      	guest only = No
      	hosts allow = 
      	hosts deny = 
      	inherit acls = No
      	inherit owner = no
      	inherit permissions = No
      	invalid users = 
      	read list = 
      	read only = Yes
      	smb encrypt = default
      	valid users = 
      	write list = 
      	aio read size = 16384
      	aio write behind = 
      	aio write size = 16384
      	allocation roundup size = 4096
      	block size = 1024
      	max connections = 0
      	min print space = 0
      	strict allocate = Yes
      	strict rename = No
      	strict sync = No
      	sync always = No
      	use sendfile = Yes
      	write cache size = 0
      	msdfs proxy = 
      	msdfs root = No
      	msdfs shuffle referrals = No
      	ntvfs handler = unixuid, default
      	vfs objects = dfs_samba4 acl_xattr
      
      
      [netlogon]
      	path = /usr/local/samba/var/locks/sysvol/*****.com/scripts
      	read only = No
      
      
      [sysvol]
      	path = /usr/local/samba/var/locks/sysvol
      	read only = No
      
      
      [Users]
      	path = /Users
      	csc policy = documents
      	read only = No
      	directory_mode: parameter = 0700
      

  • Hoenstly iam done with samba

    For Years i struggle with performance issues, specially on virtulized setups (kvm with virtio driver) shure samba 4 has some really nice features and a real domain. thats all fine but no matter waht i try i never get even close to the performance i should have.

    whiel network speedtests bring up almost the full gbit, samba is at best at 50-60mb/sec on large files. options above do help a bit but its far from a stable connect (jumps arounds 5-9 mb up and down) and never gets over 65mb/sec compared on the same physical host with an identical machine i runa 2012r2 with dedupe on the same spec (2cpus 2gig ram) one smb connect and get almsot rock solid 100mb/sec so something is off with samba.

    what i noticed is i can improve a bit by nicing the smbd process but that makes things not really better, i mean 30% cpu usage with signing off is a bit much now iam going to switch voer to windows for smb for good.

    data deduplication is a big factor there too (cant switch to zfs right now on linux) and the windows version does actually very good job on deduping on a block level.

    on one hadn iam really sad about this, and doesnt make my life easier on the other samba isnt production ready yet, (after over a decade of trying) and probably never will. :(

    Reply

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