How to increase download speed in Samba on Debian?

Question

Debian

Hello.
There is a server on Debian 7.8 with Samba 3.6.6.
This config is used:

[global]
  workgroup = WORKGROUP
  #realm = WORKGROUP
  netbios name = lazyvat
  server string = Main File Server
#  hosts allow =  10.0.0.0/24 127.0.0.1
#  log file = /var/log/samba/log.smbd
#  max xmit = 64000
# socket options = IPTOS_LOWDELAY TCP_NODELAY SO_SNDBUF=64000 SO_RCVBUF=64000 SO_KEEPALIVE  
 log file = /dev/null
   log level = 0 
  max log size = 50
  dead time = 15
  security = user
 map to guest = bad user
  guest account = nobody
  auth methods = guest, sam_ignoredomain, winbind:ntdomain
  encrypt passwords = yes
  create mask = 0664
  directory mask = 0775
  domain master = no
  local master = yes
  preferred master = yes

#load printers = no
#read size = 32768
#keepalive = 900
#disable spoolss = Yes

  os level = 65
  use mmap = yes
  use sendfile = yes
  dns proxy = no
  #idmap uid = 10000-65000
  #idmap gid = 10000-65000
  dont descend = /proc,/dev,/etc
  admin users =
  null passwords = yes
  oplocks = no
unix extensions = no
  debug level = 1
  server signing = no

 #[Private]
 #path = /DataVolume/Public/
 #comment = Private Share (For Administration Access)
 #security = user
 #writable = yes
 #map read only = no
 #guest only = no
 #guest ok = no


 [Share]
 path = "/var/base/"
 comment = base!
 public =  yes
 guest_ok = yes
 writeable = yes
 browseable = yes

[new] 
 path = "/usr/share/new/"
 comment = new!
 public =  yes
 guest_ok = yes
 writeable = yes
 browseable = yes

The download speed on the ball is very slow (700-800kb / s), in a 100Mb LAN.
I made a test bench with Ubuntu 14.04 with Samba 4.1.6 here, the speed is within 7-8Mb / s, which is already normal.
File for test ISO image weighing 400MB and 4GB.
I did everything on the ESXi virtual machine. I downloaded the file via Windows 7.
On the advice of Google, I played with socket options = IPTOS_LOWDELAY TCP_NODELAY SO_SNDBUF=64000 SO_RCVBUF=64000 SO_KEEPALIVE
None of the options offered helped.
Where and how to cheat in order to increase the speed of downloading files?

Answer 1

Config on Freebsd, I think you will find similar options for Debian. The meaning of the action:
1. sysctl.conf

net.inet.tcp.sendspace=65535
net.inet.tcp.recvspace=65535
net.inet.udp.maxdgram=57344
net.local.stream.recvspace=65535
net.local.stream.sendspace=65535
kern.ipc.maxsockbuf=16777216
kern.maxfiles=65535
kern.maxfilesperproc=32768
kern.maxvnodes=800000
net.inet.tcp.delayed_ack=0
net.inet.tcp.inflight.enable=0
net.inet.tcp.path_mtu_discovery=0
net.inet.tcp.recvbuf_auto=1
net.inet.tcp.recvbuf_inc=524288
net.inet.tcp.recvbuf_max=16777216
net.inet.tcp.recvspace=65535
net.inet.tcp.rfc1323=1
net.inet.tcp.sendbuf_auto=1
net.inet.tcp.sendbuf_inc=524288
net.inet.tcp.sendspace=65535
net.inet.udp.maxdgram=57344
net.inet.udp.recvspace=65535
net.local.stream.recvspace=65535
net.inet.tcp.sendbuf_max=16777216
net.inet.tcp.mssdflt=1460
kern.ipc.somaxconn=32768
kern.ipc.shmall=32768
kern.ipc.shmmax=134217728
kern.ipc.semmap=256

smb.conf:

[global]
<что то в конфиге> 
   socket options = SO_RCVBUF=131072 SO_SNDBUF=131072 TCP_NODELAY
    min receivefile size=16384
    use sendfile=true
    aio read size = 65535
    aio write size = 65535
    aio write behind = true
    blocking locks = no
    kernel oplocks = yes
    locking = no
    oplocks = no
    level2 oplocks = no
    posix locking = yes
    strict locking = no
    strict locking = Auto

<что то в конфиге>

if it doesn't work, we are looking for how to enable AIO for samba in Debian.